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#ifndef BOOST_SERIALIZATION_STATIC_WARNING_HPP
#define BOOST_SERIALIZATION_STATIC_WARNING_HPP
// (C) Copyright Robert Ramey 2003. Jonathan Turkanis 2004.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/static_assert for documentation.
/*
Revision history:
15 June 2003 - Initial version.
31 March 2004 - improved diagnostic messages and portability
(Jonathan Turkanis)
03 April 2004 - works on VC6 at class and namespace scope
- ported to DigitalMars
- static warnings disabled by default; when enabled,
uses pragmas to enable required compiler warnings
on MSVC, Intel, Metrowerks and Borland 5.x.
(Jonathan Turkanis)
30 May 2004 - tweaked for msvc 7.1 and gcc 3.3
- static warnings ENabled by default; when enabled,
(Robert Ramey)
*/
#include <boost/config.hpp>
//
// Implementation
// Makes use of the following warnings:
// 1. GCC prior to 3.3: division by zero.
// 2. BCC 6.0 preview: unreferenced local variable.
// 3. DigitalMars: returning address of local automatic variable.
// 4. VC6: class previously seen as struct (as in 'boost/mpl/print.hpp')
// 5. All others: deletion of pointer to incomplete type.
//
// The trick is to find code which produces warnings containing the name of
// a structure or variable. Details, with same numbering as above:
// 1. static_warning_impl<B>::value is zero iff B is false, so diving an int
// by this value generates a warning iff B is false.
// 2. static_warning_impl<B>::type has a constructor iff B is true, so an
// unreferenced variable of this type generates a warning iff B is false.
// 3. static_warning_impl<B>::type overloads operator& to return a dynamically
// allocated int pointer only is B is true, so returning the address of an
// automatic variable of this type generates a warning iff B is fasle.
// 4. static_warning_impl<B>::STATIC_WARNING is decalred as a struct iff B is
// false.
// 5. static_warning_impl<B>::type is incomplete iff B is false, so deleting a
// pointer to this type generates a warning iff B is false.
//
//------------------Enable selected warnings----------------------------------//
// Enable the warnings relied on by BOOST_STATIC_WARNING, where possible. The
// only pragma which is absolutely necessary here is for Borland 5.x, since
// W8073 is disabled by default. If enabling selected warnings is considered
// unacceptable, this section can be replaced with:
// #if defined(__BORLANDC__) && (__BORLANDC__ <= 0x600)
// pragma warn +st
// #endif
// 6. replaced implementation with one which depends solely on
// mpl::print<>. The previous one was found to fail for functions
// under recent versions of gcc and intel compilers - Robert Ramey
#include <boost/mpl/bool.hpp>
#include <boost/mpl/print.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/static_assert.hpp>
namespace boost {
namespace serialization {
template<int L>
struct BOOST_SERIALIZATION_STATIC_WARNING_LINE{};
template<bool B, int L>
struct static_warning_test{
typename boost::mpl::eval_if_c<
B,
boost::mpl::true_,
typename boost::mpl::identity<
boost::mpl::print<
BOOST_SERIALIZATION_STATIC_WARNING_LINE<L>
>
>
>::type type;
};
template<int i>
struct BOOST_SERIALIZATION_SS {};
} // serialization
} // boost
#define BOOST_SERIALIZATION_BSW(B, L) \
typedef boost::serialization::BOOST_SERIALIZATION_SS< \
sizeof( boost::serialization::static_warning_test< B, L > ) \
> BOOST_JOIN(STATIC_WARNING_LINE, L) BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE;
#define BOOST_STATIC_WARNING(B) BOOST_SERIALIZATION_BSW(B, __LINE__)
#endif // BOOST_SERIALIZATION_STATIC_WARNING_HPP
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