893 lines
35 KiB
C++
893 lines
35 KiB
C++
// Boost operators.hpp header file ----------------------------------------//
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// (C) Copyright David Abrahams, Jeremy Siek, Daryle Walker 1999-2001.
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// (C) Copyright Daniel Frey 2002-2016.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/utility/operators.htm for documentation.
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// Revision History
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// 22 Feb 16 Added ADL protection, preserve old work-arounds in
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// operators_v1.hpp and clean up this file. (Daniel Frey)
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// 16 Dec 10 Limit warning suppression for 4284 to older versions of VC++
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// (Matthew Bradbury, fixes #4432)
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// 07 Aug 08 Added "euclidean" spelling. (Daniel Frey)
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// 03 Apr 08 Make sure "convertible to bool" is sufficient
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// for T::operator<, etc. (Daniel Frey)
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// 24 May 07 Changed empty_base to depend on T, see
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// http://svn.boost.org/trac/boost/ticket/979
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// 21 Oct 02 Modified implementation of operators to allow compilers with a
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// correct named return value optimization (NRVO) to produce optimal
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// code. (Daniel Frey)
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// 02 Dec 01 Bug fixed in random_access_iteratable. (Helmut Zeisel)
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// 28 Sep 01 Factored out iterator operator groups. (Daryle Walker)
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// 27 Aug 01 'left' form for non commutative operators added;
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// additional classes for groups of related operators added;
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// workaround for empty base class optimization
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// bug of GCC 3.0 (Helmut Zeisel)
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// 25 Jun 01 output_iterator_helper changes: removed default template
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// parameters, added support for self-proxying, additional
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// documentation and tests (Aleksey Gurtovoy)
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// 29 May 01 Added operator classes for << and >>. Added input and output
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// iterator helper classes. Added classes to connect equality and
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// relational operators. Added classes for groups of related
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// operators. Reimplemented example operator and iterator helper
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// classes in terms of the new groups. (Daryle Walker, with help
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// from Alexy Gurtovoy)
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// 11 Feb 01 Fixed bugs in the iterator helpers which prevented explicitly
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// supplied arguments from actually being used (Dave Abrahams)
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// 04 Jul 00 Fixed NO_OPERATORS_IN_NAMESPACE bugs, major cleanup and
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// refactoring of compiler workarounds, additional documentation
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// (Alexy Gurtovoy and Mark Rodgers with some help and prompting from
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// Dave Abrahams)
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// 28 Jun 00 General cleanup and integration of bugfixes from Mark Rodgers and
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// Jeremy Siek (Dave Abrahams)
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// 20 Jun 00 Changes to accommodate Borland C++Builder 4 and Borland C++ 5.5
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// (Mark Rodgers)
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// 20 Jun 00 Minor fixes to the prior revision (Aleksey Gurtovoy)
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// 10 Jun 00 Support for the base class chaining technique was added
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// (Aleksey Gurtovoy). See documentation and the comments below
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// for the details.
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// 12 Dec 99 Initial version with iterator operators (Jeremy Siek)
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// 18 Nov 99 Change name "divideable" to "dividable", remove unnecessary
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// specializations of dividable, subtractable, modable (Ed Brey)
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// 17 Nov 99 Add comments (Beman Dawes)
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// Remove unnecessary specialization of operators<> (Ed Brey)
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// 15 Nov 99 Fix less_than_comparable<T,U> second operand type for first two
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// operators.(Beman Dawes)
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// 12 Nov 99 Add operators templates (Ed Brey)
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// 11 Nov 99 Add single template parameter version for compilers without
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// partial specialization (Beman Dawes)
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// 10 Nov 99 Initial version
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// 10 Jun 00:
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// An additional optional template parameter was added to most of
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// operator templates to support the base class chaining technique (see
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// documentation for the details). Unfortunately, a straightforward
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// implementation of this change would have broken compatibility with the
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// previous version of the library by making it impossible to use the same
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// template name (e.g. 'addable') for both the 1- and 2-argument versions of
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// an operator template. This implementation solves the backward-compatibility
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// issue at the cost of some simplicity.
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//
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// One of the complications is an existence of special auxiliary class template
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// 'is_chained_base<>' (see 'operators_detail' namespace below), which is used
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// to determine whether its template parameter is a library's operator template
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// or not. You have to specialize 'is_chained_base<>' for each new
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// operator template you add to the library.
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//
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// However, most of the non-trivial implementation details are hidden behind
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// several local macros defined below, and as soon as you understand them,
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// you understand the whole library implementation.
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#ifndef BOOST_OPERATORS_HPP
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#define BOOST_OPERATORS_HPP
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// If old work-arounds are needed, refer to the preserved version without
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// ADL protection.
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#if defined(BOOST_NO_OPERATORS_IN_NAMESPACE) || defined(BOOST_USE_OPERATORS_V1)
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#include "operators_v1.hpp"
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#else
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#include <cstddef>
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#include <iterator>
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#if defined(__sgi) && !defined(__GNUC__)
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# pragma set woff 1234
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#endif
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1600)
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# pragma warning( disable : 4284 ) // complaint about return type of
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#endif // operator-> not begin a UDT
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// In this section we supply the xxxx1 and xxxx2 forms of the operator
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// templates, which are explicitly targeted at the 1-type-argument and
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// 2-type-argument operator forms, respectively.
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namespace boost
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{
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namespace operators_impl
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{
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namespace operators_detail
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{
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template <typename T> class empty_base {};
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} // namespace operators_detail
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// Basic operator classes (contributed by Dave Abrahams) ------------------//
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// Note that friend functions defined in a class are implicitly inline.
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// See the C++ std, 11.4 [class.friend] paragraph 5
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct less_than_comparable2 : B
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{
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friend bool operator<=(const T& x, const U& y) { return !static_cast<bool>(x > y); }
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friend bool operator>=(const T& x, const U& y) { return !static_cast<bool>(x < y); }
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friend bool operator>(const U& x, const T& y) { return y < x; }
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friend bool operator<(const U& x, const T& y) { return y > x; }
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friend bool operator<=(const U& x, const T& y) { return !static_cast<bool>(y < x); }
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friend bool operator>=(const U& x, const T& y) { return !static_cast<bool>(y > x); }
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};
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template <class T, class B = operators_detail::empty_base<T> >
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struct less_than_comparable1 : B
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{
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friend bool operator>(const T& x, const T& y) { return y < x; }
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friend bool operator<=(const T& x, const T& y) { return !static_cast<bool>(y < x); }
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friend bool operator>=(const T& x, const T& y) { return !static_cast<bool>(x < y); }
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};
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct equality_comparable2 : B
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{
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friend bool operator==(const U& y, const T& x) { return x == y; }
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friend bool operator!=(const U& y, const T& x) { return !static_cast<bool>(x == y); }
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friend bool operator!=(const T& y, const U& x) { return !static_cast<bool>(y == x); }
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};
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template <class T, class B = operators_detail::empty_base<T> >
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struct equality_comparable1 : B
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{
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friend bool operator!=(const T& x, const T& y) { return !static_cast<bool>(x == y); }
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};
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// A macro which produces "name_2left" from "name".
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#define BOOST_OPERATOR2_LEFT(name) name##2##_##left
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// NRVO-friendly implementation (contributed by Daniel Frey) ---------------//
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#if defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS)
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// This is the optimal implementation for ISO/ANSI C++,
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// but it requires the compiler to implement the NRVO.
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// If the compiler has no NRVO, this is the best symmetric
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// implementation available.
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#define BOOST_BINARY_OPERATOR_COMMUTATIVE( NAME, OP ) \
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct NAME##2 : B \
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{ \
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friend T operator OP( const T& lhs, const U& rhs ) \
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{ T nrv( lhs ); nrv OP##= rhs; return nrv; } \
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friend T operator OP( const U& lhs, const T& rhs ) \
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{ T nrv( rhs ); nrv OP##= lhs; return nrv; } \
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}; \
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\
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template <class T, class B = operators_detail::empty_base<T> > \
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struct NAME##1 : B \
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{ \
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friend T operator OP( const T& lhs, const T& rhs ) \
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{ T nrv( lhs ); nrv OP##= rhs; return nrv; } \
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};
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#define BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( NAME, OP ) \
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct NAME##2 : B \
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{ \
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friend T operator OP( const T& lhs, const U& rhs ) \
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{ T nrv( lhs ); nrv OP##= rhs; return nrv; } \
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}; \
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\
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct BOOST_OPERATOR2_LEFT(NAME) : B \
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{ \
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friend T operator OP( const U& lhs, const T& rhs ) \
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{ T nrv( lhs ); nrv OP##= rhs; return nrv; } \
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}; \
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\
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template <class T, class B = operators_detail::empty_base<T> > \
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struct NAME##1 : B \
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{ \
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friend T operator OP( const T& lhs, const T& rhs ) \
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{ T nrv( lhs ); nrv OP##= rhs; return nrv; } \
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};
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#else // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS)
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// For compilers without NRVO the following code is optimal, but not
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// symmetric! Note that the implementation of
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// BOOST_OPERATOR2_LEFT(NAME) only looks cool, but doesn't provide
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// optimization opportunities to the compiler :)
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#define BOOST_BINARY_OPERATOR_COMMUTATIVE( NAME, OP ) \
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct NAME##2 : B \
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{ \
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friend T operator OP( T lhs, const U& rhs ) { return lhs OP##= rhs; } \
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friend T operator OP( const U& lhs, T rhs ) { return rhs OP##= lhs; } \
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}; \
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\
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template <class T, class B = operators_detail::empty_base<T> > \
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struct NAME##1 : B \
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{ \
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friend T operator OP( T lhs, const T& rhs ) { return lhs OP##= rhs; } \
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};
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#define BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( NAME, OP ) \
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct NAME##2 : B \
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{ \
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friend T operator OP( T lhs, const U& rhs ) { return lhs OP##= rhs; } \
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}; \
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\
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct BOOST_OPERATOR2_LEFT(NAME) : B \
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{ \
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friend T operator OP( const U& lhs, const T& rhs ) \
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{ return T( lhs ) OP##= rhs; } \
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}; \
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\
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template <class T, class B = operators_detail::empty_base<T> > \
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struct NAME##1 : B \
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{ \
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friend T operator OP( T lhs, const T& rhs ) { return lhs OP##= rhs; } \
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};
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#endif // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS)
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BOOST_BINARY_OPERATOR_COMMUTATIVE( multipliable, * )
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BOOST_BINARY_OPERATOR_COMMUTATIVE( addable, + )
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BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( subtractable, - )
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BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( dividable, / )
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BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( modable, % )
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BOOST_BINARY_OPERATOR_COMMUTATIVE( xorable, ^ )
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BOOST_BINARY_OPERATOR_COMMUTATIVE( andable, & )
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BOOST_BINARY_OPERATOR_COMMUTATIVE( orable, | )
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#undef BOOST_BINARY_OPERATOR_COMMUTATIVE
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#undef BOOST_BINARY_OPERATOR_NON_COMMUTATIVE
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#undef BOOST_OPERATOR2_LEFT
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// incrementable and decrementable contributed by Jeremy Siek
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template <class T, class B = operators_detail::empty_base<T> >
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struct incrementable : B
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{
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friend T operator++(T& x, int)
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{
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incrementable_type nrv(x);
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++x;
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return nrv;
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}
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private: // The use of this typedef works around a Borland bug
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typedef T incrementable_type;
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};
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template <class T, class B = operators_detail::empty_base<T> >
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struct decrementable : B
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{
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friend T operator--(T& x, int)
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{
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decrementable_type nrv(x);
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--x;
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return nrv;
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}
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private: // The use of this typedef works around a Borland bug
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typedef T decrementable_type;
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};
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// Iterator operator classes (contributed by Jeremy Siek) ------------------//
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template <class T, class P, class B = operators_detail::empty_base<T> >
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struct dereferenceable : B
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{
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P operator->() const
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{
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return &*static_cast<const T&>(*this);
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}
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};
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template <class T, class I, class R, class B = operators_detail::empty_base<T> >
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struct indexable : B
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{
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R operator[](I n) const
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{
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return *(static_cast<const T&>(*this) + n);
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}
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};
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// More operator classes (contributed by Daryle Walker) --------------------//
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// (NRVO-friendly implementation contributed by Daniel Frey) ---------------//
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#if defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS)
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#define BOOST_BINARY_OPERATOR( NAME, OP ) \
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct NAME##2 : B \
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{ \
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friend T operator OP( const T& lhs, const U& rhs ) \
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{ T nrv( lhs ); nrv OP##= rhs; return nrv; } \
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}; \
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\
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template <class T, class B = operators_detail::empty_base<T> > \
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struct NAME##1 : B \
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{ \
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friend T operator OP( const T& lhs, const T& rhs ) \
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{ T nrv( lhs ); nrv OP##= rhs; return nrv; } \
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};
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#else // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS)
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#define BOOST_BINARY_OPERATOR( NAME, OP ) \
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template <class T, class U, class B = operators_detail::empty_base<T> > \
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struct NAME##2 : B \
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{ \
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friend T operator OP( T lhs, const U& rhs ) { return lhs OP##= rhs; } \
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}; \
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\
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template <class T, class B = operators_detail::empty_base<T> > \
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struct NAME##1 : B \
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{ \
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friend T operator OP( T lhs, const T& rhs ) { return lhs OP##= rhs; } \
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};
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#endif // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS)
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BOOST_BINARY_OPERATOR( left_shiftable, << )
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BOOST_BINARY_OPERATOR( right_shiftable, >> )
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#undef BOOST_BINARY_OPERATOR
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct equivalent2 : B
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{
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friend bool operator==(const T& x, const U& y)
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{
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return !static_cast<bool>(x < y) && !static_cast<bool>(x > y);
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}
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};
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template <class T, class B = operators_detail::empty_base<T> >
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struct equivalent1 : B
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{
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friend bool operator==(const T&x, const T&y)
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{
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return !static_cast<bool>(x < y) && !static_cast<bool>(y < x);
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}
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};
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct partially_ordered2 : B
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{
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friend bool operator<=(const T& x, const U& y)
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{ return static_cast<bool>(x < y) || static_cast<bool>(x == y); }
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friend bool operator>=(const T& x, const U& y)
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{ return static_cast<bool>(x > y) || static_cast<bool>(x == y); }
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friend bool operator>(const U& x, const T& y)
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{ return y < x; }
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friend bool operator<(const U& x, const T& y)
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{ return y > x; }
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friend bool operator<=(const U& x, const T& y)
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{ return static_cast<bool>(y > x) || static_cast<bool>(y == x); }
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friend bool operator>=(const U& x, const T& y)
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{ return static_cast<bool>(y < x) || static_cast<bool>(y == x); }
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};
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template <class T, class B = operators_detail::empty_base<T> >
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struct partially_ordered1 : B
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{
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friend bool operator>(const T& x, const T& y)
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{ return y < x; }
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friend bool operator<=(const T& x, const T& y)
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{ return static_cast<bool>(x < y) || static_cast<bool>(x == y); }
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friend bool operator>=(const T& x, const T& y)
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{ return static_cast<bool>(y < x) || static_cast<bool>(x == y); }
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};
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// Combined operator classes (contributed by Daryle Walker) ----------------//
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct totally_ordered2
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: less_than_comparable2<T, U
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, equality_comparable2<T, U, B
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> > {};
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template <class T, class B = operators_detail::empty_base<T> >
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struct totally_ordered1
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: less_than_comparable1<T
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, equality_comparable1<T, B
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> > {};
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct additive2
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: addable2<T, U
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, subtractable2<T, U, B
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> > {};
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template <class T, class B = operators_detail::empty_base<T> >
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struct additive1
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: addable1<T
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, subtractable1<T, B
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> > {};
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct multiplicative2
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: multipliable2<T, U
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, dividable2<T, U, B
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> > {};
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template <class T, class B = operators_detail::empty_base<T> >
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struct multiplicative1
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: multipliable1<T
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, dividable1<T, B
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> > {};
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template <class T, class U, class B = operators_detail::empty_base<T> >
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struct integer_multiplicative2
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: multiplicative2<T, U
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, modable2<T, U, B
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> > {};
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template <class T, class B = operators_detail::empty_base<T> >
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struct integer_multiplicative1
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: multiplicative1<T
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, modable1<T, B
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> > {};
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template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct arithmetic2
|
|
: additive2<T, U
|
|
, multiplicative2<T, U, B
|
|
> > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct arithmetic1
|
|
: additive1<T
|
|
, multiplicative1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct integer_arithmetic2
|
|
: additive2<T, U
|
|
, integer_multiplicative2<T, U, B
|
|
> > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct integer_arithmetic1
|
|
: additive1<T
|
|
, integer_multiplicative1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct bitwise2
|
|
: xorable2<T, U
|
|
, andable2<T, U
|
|
, orable2<T, U, B
|
|
> > > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct bitwise1
|
|
: xorable1<T
|
|
, andable1<T
|
|
, orable1<T, B
|
|
> > > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct unit_steppable
|
|
: incrementable<T
|
|
, decrementable<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct shiftable2
|
|
: left_shiftable2<T, U
|
|
, right_shiftable2<T, U, B
|
|
> > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct shiftable1
|
|
: left_shiftable1<T
|
|
, right_shiftable1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct ring_operators2
|
|
: additive2<T, U
|
|
, subtractable2_left<T, U
|
|
, multipliable2<T, U, B
|
|
> > > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct ring_operators1
|
|
: additive1<T
|
|
, multipliable1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct ordered_ring_operators2
|
|
: ring_operators2<T, U
|
|
, totally_ordered2<T, U, B
|
|
> > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct ordered_ring_operators1
|
|
: ring_operators1<T
|
|
, totally_ordered1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct field_operators2
|
|
: ring_operators2<T, U
|
|
, dividable2<T, U
|
|
, dividable2_left<T, U, B
|
|
> > > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct field_operators1
|
|
: ring_operators1<T
|
|
, dividable1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct ordered_field_operators2
|
|
: field_operators2<T, U
|
|
, totally_ordered2<T, U, B
|
|
> > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct ordered_field_operators1
|
|
: field_operators1<T
|
|
, totally_ordered1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct euclidian_ring_operators2
|
|
: ring_operators2<T, U
|
|
, dividable2<T, U
|
|
, dividable2_left<T, U
|
|
, modable2<T, U
|
|
, modable2_left<T, U, B
|
|
> > > > > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct euclidian_ring_operators1
|
|
: ring_operators1<T
|
|
, dividable1<T
|
|
, modable1<T, B
|
|
> > > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct ordered_euclidian_ring_operators2
|
|
: totally_ordered2<T, U
|
|
, euclidian_ring_operators2<T, U, B
|
|
> > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct ordered_euclidian_ring_operators1
|
|
: totally_ordered1<T
|
|
, euclidian_ring_operators1<T, B
|
|
> > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct euclidean_ring_operators2
|
|
: ring_operators2<T, U
|
|
, dividable2<T, U
|
|
, dividable2_left<T, U
|
|
, modable2<T, U
|
|
, modable2_left<T, U, B
|
|
> > > > > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct euclidean_ring_operators1
|
|
: ring_operators1<T
|
|
, dividable1<T
|
|
, modable1<T, B
|
|
> > > {};
|
|
|
|
template <class T, class U, class B = operators_detail::empty_base<T> >
|
|
struct ordered_euclidean_ring_operators2
|
|
: totally_ordered2<T, U
|
|
, euclidean_ring_operators2<T, U, B
|
|
> > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct ordered_euclidean_ring_operators1
|
|
: totally_ordered1<T
|
|
, euclidean_ring_operators1<T, B
|
|
> > {};
|
|
|
|
template <class T, class P, class B = operators_detail::empty_base<T> >
|
|
struct input_iteratable
|
|
: equality_comparable1<T
|
|
, incrementable<T
|
|
, dereferenceable<T, P, B
|
|
> > > {};
|
|
|
|
template <class T, class B = operators_detail::empty_base<T> >
|
|
struct output_iteratable
|
|
: incrementable<T, B
|
|
> {};
|
|
|
|
template <class T, class P, class B = operators_detail::empty_base<T> >
|
|
struct forward_iteratable
|
|
: input_iteratable<T, P, B
|
|
> {};
|
|
|
|
template <class T, class P, class B = operators_detail::empty_base<T> >
|
|
struct bidirectional_iteratable
|
|
: forward_iteratable<T, P
|
|
, decrementable<T, B
|
|
> > {};
|
|
|
|
// To avoid repeated derivation from equality_comparable,
|
|
// which is an indirect base class of bidirectional_iterable,
|
|
// random_access_iteratable must not be derived from totally_ordered1
|
|
// but from less_than_comparable1 only. (Helmut Zeisel, 02-Dec-2001)
|
|
template <class T, class P, class D, class R, class B = operators_detail::empty_base<T> >
|
|
struct random_access_iteratable
|
|
: bidirectional_iteratable<T, P
|
|
, less_than_comparable1<T
|
|
, additive2<T, D
|
|
, indexable<T, D, R, B
|
|
> > > > {};
|
|
|
|
|
|
//
|
|
// Here's where we put it all together, defining the xxxx forms of the templates.
|
|
// We also define specializations of is_chained_base<> for
|
|
// the xxxx, xxxx1, and xxxx2 templates.
|
|
//
|
|
|
|
namespace operators_detail
|
|
{
|
|
|
|
// A type parameter is used instead of a plain bool because Borland's compiler
|
|
// didn't cope well with the more obvious non-type template parameter.
|
|
struct true_t {};
|
|
struct false_t {};
|
|
|
|
} // namespace operators_detail
|
|
|
|
// is_chained_base<> - a traits class used to distinguish whether an operator
|
|
// template argument is being used for base class chaining, or is specifying a
|
|
// 2nd argument type.
|
|
|
|
// Unspecialized version assumes that most types are not being used for base
|
|
// class chaining. We specialize for the operator templates defined in this
|
|
// library.
|
|
template<class T> struct is_chained_base {
|
|
typedef operators_detail::false_t value;
|
|
};
|
|
|
|
// Provide a specialization of 'is_chained_base<>'
|
|
// for a 4-type-argument operator template.
|
|
# define BOOST_OPERATOR_TEMPLATE4(template_name4) \
|
|
template<class T, class U, class V, class W, class B> \
|
|
struct is_chained_base< template_name4<T, U, V, W, B> > { \
|
|
typedef operators_detail::true_t value; \
|
|
};
|
|
|
|
// Provide a specialization of 'is_chained_base<>'
|
|
// for a 3-type-argument operator template.
|
|
# define BOOST_OPERATOR_TEMPLATE3(template_name3) \
|
|
template<class T, class U, class V, class B> \
|
|
struct is_chained_base< template_name3<T, U, V, B> > { \
|
|
typedef operators_detail::true_t value; \
|
|
};
|
|
|
|
// Provide a specialization of 'is_chained_base<>'
|
|
// for a 2-type-argument operator template.
|
|
# define BOOST_OPERATOR_TEMPLATE2(template_name2) \
|
|
template<class T, class U, class B> \
|
|
struct is_chained_base< template_name2<T, U, B> > { \
|
|
typedef operators_detail::true_t value; \
|
|
};
|
|
|
|
// Provide a specialization of 'is_chained_base<>'
|
|
// for a 1-type-argument operator template.
|
|
# define BOOST_OPERATOR_TEMPLATE1(template_name1) \
|
|
template<class T, class B> \
|
|
struct is_chained_base< template_name1<T, B> > { \
|
|
typedef operators_detail::true_t value; \
|
|
};
|
|
|
|
// BOOST_OPERATOR_TEMPLATE(template_name) defines template_name<> such that it
|
|
// can be used for specifying both 1-argument and 2-argument forms. Requires the
|
|
// existence of two previously defined class templates named '<template_name>1'
|
|
// and '<template_name>2' which must implement the corresponding 1- and 2-
|
|
// argument forms.
|
|
//
|
|
// The template type parameter O == is_chained_base<U>::value is used to
|
|
// distinguish whether the 2nd argument to <template_name> is being used for
|
|
// base class chaining from another boost operator template or is describing a
|
|
// 2nd operand type. O == true_t only when U is actually an another operator
|
|
// template from the library. Partial specialization is used to select an
|
|
// implementation in terms of either '<template_name>1' or '<template_name>2'.
|
|
//
|
|
|
|
# define BOOST_OPERATOR_TEMPLATE(template_name) \
|
|
template <class T \
|
|
,class U = T \
|
|
,class B = operators_detail::empty_base<T> \
|
|
,class O = typename is_chained_base<U>::value \
|
|
> \
|
|
struct template_name; \
|
|
\
|
|
template<class T, class U, class B> \
|
|
struct template_name<T, U, B, operators_detail::false_t> \
|
|
: template_name##2<T, U, B> {}; \
|
|
\
|
|
template<class T, class U> \
|
|
struct template_name<T, U, operators_detail::empty_base<T>, operators_detail::true_t> \
|
|
: template_name##1<T, U> {}; \
|
|
\
|
|
template <class T, class B> \
|
|
struct template_name<T, T, B, operators_detail::false_t> \
|
|
: template_name##1<T, B> {}; \
|
|
\
|
|
template<class T, class U, class B, class O> \
|
|
struct is_chained_base< template_name<T, U, B, O> > { \
|
|
typedef operators_detail::true_t value; \
|
|
}; \
|
|
\
|
|
BOOST_OPERATOR_TEMPLATE2(template_name##2) \
|
|
BOOST_OPERATOR_TEMPLATE1(template_name##1)
|
|
|
|
BOOST_OPERATOR_TEMPLATE(less_than_comparable)
|
|
BOOST_OPERATOR_TEMPLATE(equality_comparable)
|
|
BOOST_OPERATOR_TEMPLATE(multipliable)
|
|
BOOST_OPERATOR_TEMPLATE(addable)
|
|
BOOST_OPERATOR_TEMPLATE(subtractable)
|
|
BOOST_OPERATOR_TEMPLATE2(subtractable2_left)
|
|
BOOST_OPERATOR_TEMPLATE(dividable)
|
|
BOOST_OPERATOR_TEMPLATE2(dividable2_left)
|
|
BOOST_OPERATOR_TEMPLATE(modable)
|
|
BOOST_OPERATOR_TEMPLATE2(modable2_left)
|
|
BOOST_OPERATOR_TEMPLATE(xorable)
|
|
BOOST_OPERATOR_TEMPLATE(andable)
|
|
BOOST_OPERATOR_TEMPLATE(orable)
|
|
|
|
BOOST_OPERATOR_TEMPLATE1(incrementable)
|
|
BOOST_OPERATOR_TEMPLATE1(decrementable)
|
|
|
|
BOOST_OPERATOR_TEMPLATE2(dereferenceable)
|
|
BOOST_OPERATOR_TEMPLATE3(indexable)
|
|
|
|
BOOST_OPERATOR_TEMPLATE(left_shiftable)
|
|
BOOST_OPERATOR_TEMPLATE(right_shiftable)
|
|
BOOST_OPERATOR_TEMPLATE(equivalent)
|
|
BOOST_OPERATOR_TEMPLATE(partially_ordered)
|
|
|
|
BOOST_OPERATOR_TEMPLATE(totally_ordered)
|
|
BOOST_OPERATOR_TEMPLATE(additive)
|
|
BOOST_OPERATOR_TEMPLATE(multiplicative)
|
|
BOOST_OPERATOR_TEMPLATE(integer_multiplicative)
|
|
BOOST_OPERATOR_TEMPLATE(arithmetic)
|
|
BOOST_OPERATOR_TEMPLATE(integer_arithmetic)
|
|
BOOST_OPERATOR_TEMPLATE(bitwise)
|
|
BOOST_OPERATOR_TEMPLATE1(unit_steppable)
|
|
BOOST_OPERATOR_TEMPLATE(shiftable)
|
|
BOOST_OPERATOR_TEMPLATE(ring_operators)
|
|
BOOST_OPERATOR_TEMPLATE(ordered_ring_operators)
|
|
BOOST_OPERATOR_TEMPLATE(field_operators)
|
|
BOOST_OPERATOR_TEMPLATE(ordered_field_operators)
|
|
BOOST_OPERATOR_TEMPLATE(euclidian_ring_operators)
|
|
BOOST_OPERATOR_TEMPLATE(ordered_euclidian_ring_operators)
|
|
BOOST_OPERATOR_TEMPLATE(euclidean_ring_operators)
|
|
BOOST_OPERATOR_TEMPLATE(ordered_euclidean_ring_operators)
|
|
BOOST_OPERATOR_TEMPLATE2(input_iteratable)
|
|
BOOST_OPERATOR_TEMPLATE1(output_iteratable)
|
|
BOOST_OPERATOR_TEMPLATE2(forward_iteratable)
|
|
BOOST_OPERATOR_TEMPLATE2(bidirectional_iteratable)
|
|
BOOST_OPERATOR_TEMPLATE4(random_access_iteratable)
|
|
|
|
#undef BOOST_OPERATOR_TEMPLATE
|
|
#undef BOOST_OPERATOR_TEMPLATE4
|
|
#undef BOOST_OPERATOR_TEMPLATE3
|
|
#undef BOOST_OPERATOR_TEMPLATE2
|
|
#undef BOOST_OPERATOR_TEMPLATE1
|
|
|
|
template <class T, class U>
|
|
struct operators2
|
|
: totally_ordered2<T,U
|
|
, integer_arithmetic2<T,U
|
|
, bitwise2<T,U
|
|
> > > {};
|
|
|
|
template <class T, class U = T>
|
|
struct operators : operators2<T, U> {};
|
|
|
|
template <class T> struct operators<T, T>
|
|
: totally_ordered<T
|
|
, integer_arithmetic<T
|
|
, bitwise<T
|
|
, unit_steppable<T
|
|
> > > > {};
|
|
|
|
// Iterator helper classes (contributed by Jeremy Siek) -------------------//
|
|
// (Input and output iterator helpers contributed by Daryle Walker) -------//
|
|
// (Changed to use combined operator classes by Daryle Walker) ------------//
|
|
template <class T,
|
|
class V,
|
|
class D = std::ptrdiff_t,
|
|
class P = V const *,
|
|
class R = V const &>
|
|
struct input_iterator_helper
|
|
: input_iteratable<T, P
|
|
, std::iterator<std::input_iterator_tag, V, D, P, R
|
|
> > {};
|
|
|
|
template<class T>
|
|
struct output_iterator_helper
|
|
: output_iteratable<T
|
|
, std::iterator<std::output_iterator_tag, void, void, void, void
|
|
> >
|
|
{
|
|
T& operator*() { return static_cast<T&>(*this); }
|
|
T& operator++() { return static_cast<T&>(*this); }
|
|
};
|
|
|
|
template <class T,
|
|
class V,
|
|
class D = std::ptrdiff_t,
|
|
class P = V*,
|
|
class R = V&>
|
|
struct forward_iterator_helper
|
|
: forward_iteratable<T, P
|
|
, std::iterator<std::forward_iterator_tag, V, D, P, R
|
|
> > {};
|
|
|
|
template <class T,
|
|
class V,
|
|
class D = std::ptrdiff_t,
|
|
class P = V*,
|
|
class R = V&>
|
|
struct bidirectional_iterator_helper
|
|
: bidirectional_iteratable<T, P
|
|
, std::iterator<std::bidirectional_iterator_tag, V, D, P, R
|
|
> > {};
|
|
|
|
template <class T,
|
|
class V,
|
|
class D = std::ptrdiff_t,
|
|
class P = V*,
|
|
class R = V&>
|
|
struct random_access_iterator_helper
|
|
: random_access_iteratable<T, P, D, R
|
|
, std::iterator<std::random_access_iterator_tag, V, D, P, R
|
|
> >
|
|
{
|
|
friend D requires_difference_operator(const T& x, const T& y) {
|
|
return x - y;
|
|
}
|
|
}; // random_access_iterator_helper
|
|
|
|
} // namespace operators_impl
|
|
using namespace operators_impl;
|
|
|
|
} // namespace boost
|
|
|
|
#if defined(__sgi) && !defined(__GNUC__)
|
|
#pragma reset woff 1234
|
|
#endif
|
|
|
|
#endif // BOOST_NO_OPERATORS_IN_NAMESPACE
|
|
#endif // BOOST_OPERATORS_HPP
|