104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
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#ifndef BOOST_SERIALIZATION_STATIC_WARNING_HPP
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#define BOOST_SERIALIZATION_STATIC_WARNING_HPP
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// (C) Copyright Robert Ramey 2003. Jonathan Turkanis 2004.
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/static_assert for documentation.
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/*
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Revision history:
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15 June 2003 - Initial version.
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31 March 2004 - improved diagnostic messages and portability
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(Jonathan Turkanis)
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03 April 2004 - works on VC6 at class and namespace scope
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- ported to DigitalMars
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- static warnings disabled by default; when enabled,
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uses pragmas to enable required compiler warnings
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on MSVC, Intel, Metrowerks and Borland 5.x.
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(Jonathan Turkanis)
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30 May 2004 - tweaked for msvc 7.1 and gcc 3.3
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- static warnings ENabled by default; when enabled,
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(Robert Ramey)
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*/
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#include <boost/config.hpp>
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//
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// Implementation
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// Makes use of the following warnings:
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// 1. GCC prior to 3.3: division by zero.
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// 2. BCC 6.0 preview: unreferenced local variable.
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// 3. DigitalMars: returning address of local automatic variable.
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// 4. VC6: class previously seen as struct (as in 'boost/mpl/print.hpp')
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// 5. All others: deletion of pointer to incomplete type.
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//
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// The trick is to find code which produces warnings containing the name of
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// a structure or variable. Details, with same numbering as above:
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// 1. static_warning_impl<B>::value is zero iff B is false, so diving an int
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// by this value generates a warning iff B is false.
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// 2. static_warning_impl<B>::type has a constructor iff B is true, so an
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// unreferenced variable of this type generates a warning iff B is false.
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// 3. static_warning_impl<B>::type overloads operator& to return a dynamically
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// allocated int pointer only is B is true, so returning the address of an
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// automatic variable of this type generates a warning iff B is fasle.
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// 4. static_warning_impl<B>::STATIC_WARNING is decalred as a struct iff B is
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// false.
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// 5. static_warning_impl<B>::type is incomplete iff B is false, so deleting a
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// pointer to this type generates a warning iff B is false.
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//
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//------------------Enable selected warnings----------------------------------//
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// Enable the warnings relied on by BOOST_STATIC_WARNING, where possible.
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// 6. replaced implementation with one which depends solely on
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// mpl::print<>. The previous one was found to fail for functions
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// under recent versions of gcc and intel compilers - Robert Ramey
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/print.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/bool_fwd.hpp>
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#include <boost/static_assert.hpp>
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namespace boost {
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namespace serialization {
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template<int L>
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struct BOOST_SERIALIZATION_STATIC_WARNING_LINE{};
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template<bool B, int L>
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struct static_warning_test{
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typename boost::mpl::eval_if_c<
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B,
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boost::mpl::true_,
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typename boost::mpl::identity<
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boost::mpl::print<
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BOOST_SERIALIZATION_STATIC_WARNING_LINE<L>
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>
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>
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>::type type;
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};
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template<int i>
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struct BOOST_SERIALIZATION_SS {};
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} // serialization
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} // boost
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#define BOOST_SERIALIZATION_BSW(B, L) \
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typedef boost::serialization::BOOST_SERIALIZATION_SS< \
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sizeof( boost::serialization::static_warning_test< B, L > ) \
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> BOOST_JOIN(STATIC_WARNING_LINE, L) BOOST_ATTRIBUTE_UNUSED;
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#define BOOST_STATIC_WARNING(B) BOOST_SERIALIZATION_BSW(B, __LINE__)
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#endif // BOOST_SERIALIZATION_STATIC_WARNING_HPP
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