173 lines
4.4 KiB
C++
173 lines
4.4 KiB
C++
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See 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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//
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// See http://www.boost.org/libs/utility for most recent version including documentation.
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// call_traits: defines typedefs for function usage
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// (see libs/utility/call_traits.htm)
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/* Release notes:
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23rd July 2000:
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Fixed array specialization. (JM)
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Added Borland specific fixes for reference types
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(issue raised by Steve Cleary).
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*/
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#ifndef BOOST_DETAIL_CALL_TRAITS_HPP
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#define BOOST_DETAIL_CALL_TRAITS_HPP
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#ifndef BOOST_CONFIG_HPP
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#include <boost/config.hpp>
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#endif
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#include <cstddef>
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#include <boost/type_traits/is_arithmetic.hpp>
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#include <boost/type_traits/is_enum.hpp>
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#include <boost/type_traits/is_pointer.hpp>
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#include <boost/detail/workaround.hpp>
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namespace boost{
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namespace detail{
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template <typename T, bool small_>
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struct ct_imp2
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{
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typedef const T& param_type;
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};
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template <typename T>
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struct ct_imp2<T, true>
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{
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typedef const T param_type;
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};
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template <typename T, bool isp, bool b1, bool b2>
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struct ct_imp
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{
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typedef const T& param_type;
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};
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template <typename T, bool isp, bool b2>
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struct ct_imp<T, isp, true, b2>
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{
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typedef typename ct_imp2<T, sizeof(T) <= sizeof(void*)>::param_type param_type;
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};
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template <typename T, bool isp, bool b1>
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struct ct_imp<T, isp, b1, true>
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{
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typedef typename ct_imp2<T, sizeof(T) <= sizeof(void*)>::param_type param_type;
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};
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template <typename T, bool b1, bool b2>
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struct ct_imp<T, true, b1, b2>
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{
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typedef const T param_type;
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};
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}
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template <typename T>
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struct call_traits
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{
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public:
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typedef T value_type;
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typedef T& reference;
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typedef const T& const_reference;
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//
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// C++ Builder workaround: we should be able to define a compile time
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// constant and pass that as a single template parameter to ct_imp<T,bool>,
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// however compiler bugs prevent this - instead pass three bool's to
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// ct_imp<T,bool,bool,bool> and add an extra partial specialisation
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// of ct_imp to handle the logic. (JM)
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typedef typename boost::detail::ct_imp<
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T,
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::boost::is_pointer<T>::value,
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::boost::is_arithmetic<T>::value,
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::boost::is_enum<T>::value
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>::param_type param_type;
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};
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template <typename T>
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struct call_traits<T&>
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{
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typedef T& value_type;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T& param_type; // hh removed const
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};
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#if BOOST_WORKAROUND( __BORLANDC__, < 0x5A0 )
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// these are illegal specialisations; cv-qualifies applied to
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// references have no effect according to [8.3.2p1],
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// C++ Builder requires them though as it treats cv-qualified
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// references as distinct types...
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template <typename T>
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struct call_traits<T&const>
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{
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typedef T& value_type;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T& param_type; // hh removed const
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};
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template <typename T>
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struct call_traits<T&volatile>
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{
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typedef T& value_type;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T& param_type; // hh removed const
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};
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template <typename T>
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struct call_traits<T&const volatile>
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{
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typedef T& value_type;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T& param_type; // hh removed const
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};
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template <typename T>
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struct call_traits< T * >
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{
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typedef T * value_type;
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typedef T * & reference;
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typedef T * const & const_reference;
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typedef T * const param_type; // hh removed const
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};
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#endif
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#if !defined(BOOST_NO_ARRAY_TYPE_SPECIALIZATIONS)
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template <typename T, std::size_t N>
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struct call_traits<T [N]>
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{
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private:
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typedef T array_type[N];
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public:
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// degrades array to pointer:
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typedef const T* value_type;
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typedef array_type& reference;
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typedef const array_type& const_reference;
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typedef const T* const param_type;
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};
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template <typename T, std::size_t N>
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struct call_traits<const T [N]>
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{
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private:
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typedef const T array_type[N];
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public:
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// degrades array to pointer:
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typedef const T* value_type;
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typedef array_type& reference;
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typedef const array_type& const_reference;
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typedef const T* const param_type;
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};
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#endif
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}
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#endif // BOOST_DETAIL_CALL_TRAITS_HPP
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