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180 lines
7.0 KiB
180 lines
7.0 KiB
// (C) Copyright John Maddock 2000. |
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// Use, modification and distribution are subject to the |
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// Boost Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at 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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02 August 2000 |
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Initial version. |
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*/ |
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#ifndef BOOST_STATIC_ASSERT_HPP |
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#define BOOST_STATIC_ASSERT_HPP |
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#include <boost/config.hpp> |
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#include <boost/detail/workaround.hpp> |
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#if defined(__GNUC__) && !defined(__GXX_EXPERIMENTAL_CXX0X__) |
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// |
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// This is horrible, but it seems to be the only we can shut up the |
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// "anonymous variadic macros were introduced in C99 [-Wvariadic-macros]" |
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// warning that get spewed out otherwise in non-C++11 mode. |
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// |
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#pragma GCC system_header |
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#endif |
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#ifndef BOOST_NO_CXX11_STATIC_ASSERT |
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# ifndef BOOST_NO_CXX11_VARIADIC_MACROS |
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# define BOOST_STATIC_ASSERT_MSG( ... ) static_assert(__VA_ARGS__) |
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# else |
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# define BOOST_STATIC_ASSERT_MSG( B, Msg ) static_assert( B, Msg ) |
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# endif |
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#else |
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# define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B ) |
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#endif |
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#ifdef __BORLANDC__ |
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// |
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// workaround for buggy integral-constant expression support: |
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#define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS |
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#endif |
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#if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4)) |
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// gcc 3.3 and 3.4 don't produce good error messages with the default version: |
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# define BOOST_SA_GCC_WORKAROUND |
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#endif |
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// |
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// If the compiler issues warnings about old C style casts, |
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// then enable this: |
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// |
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#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4))) |
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# ifndef BOOST_NO_CXX11_VARIADIC_MACROS |
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# define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) ((__VA_ARGS__) != 0) |
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# else |
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# define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) != 0) |
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# endif |
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#else |
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# ifndef BOOST_NO_CXX11_VARIADIC_MACROS |
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# define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) (bool)(__VA_ARGS__) |
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# else |
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# define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x) |
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# endif |
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#endif |
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#ifndef BOOST_NO_CXX11_STATIC_ASSERT |
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# ifndef BOOST_NO_CXX11_VARIADIC_MACROS |
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# define BOOST_STATIC_ASSERT( ... ) static_assert(__VA_ARGS__, #__VA_ARGS__) |
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# else |
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# define BOOST_STATIC_ASSERT( B ) static_assert(B, #B) |
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# endif |
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#else |
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namespace boost{ |
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// HP aCC cannot deal with missing names for template value parameters |
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template <bool x> struct STATIC_ASSERTION_FAILURE; |
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template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; }; |
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// HP aCC cannot deal with missing names for template value parameters |
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template<int x> struct static_assert_test{}; |
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} |
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// |
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// Implicit instantiation requires that all member declarations be |
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// instantiated, but that the definitions are *not* instantiated. |
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// |
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// It's not particularly clear how this applies to enum's or typedefs; |
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// both are described as declarations [7.1.3] and [7.2] in the standard, |
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// however some compilers use "delayed evaluation" of one or more of |
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// these when implicitly instantiating templates. We use typedef declarations |
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// by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum |
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// version gets better results from your compiler... |
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// |
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// Implementation: |
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// Both of these versions rely on sizeof(incomplete_type) generating an error |
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// message containing the name of the incomplete type. We use |
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// "STATIC_ASSERTION_FAILURE" as the type name here to generate |
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// an eye catching error message. The result of the sizeof expression is either |
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// used as an enum initialiser, or as a template argument depending which version |
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// is in use... |
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// Note that the argument to the assert is explicitly cast to bool using old- |
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// style casts: too many compilers currently have problems with static_cast |
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// when used inside integral constant expressions. |
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// |
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#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS) |
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#if defined(BOOST_MSVC) && defined(BOOST_NO_CXX11_VARIADIC_MACROS) |
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#define BOOST_STATIC_ASSERT( B ) \ |
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typedef ::boost::static_assert_test<\ |
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sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\ |
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BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__) |
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#elif defined(BOOST_MSVC) |
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#define BOOST_STATIC_ASSERT(...) \ |
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typedef ::boost::static_assert_test<\ |
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sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST (__VA_ARGS__) >)>\ |
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BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__) |
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#elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && defined(BOOST_NO_CXX11_VARIADIC_MACROS) |
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// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error |
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// instead of warning in case of failure |
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# define BOOST_STATIC_ASSERT( B ) \ |
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typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \ |
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[ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ] |
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#elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && !defined(BOOST_NO_CXX11_VARIADIC_MACROS) |
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// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error |
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// instead of warning in case of failure |
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# define BOOST_STATIC_ASSERT(...) \ |
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typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \ |
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[ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >::value ] |
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#elif defined(__sgi) |
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// special version for SGI MIPSpro compiler |
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#define BOOST_STATIC_ASSERT( B ) \ |
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BOOST_STATIC_CONSTANT(bool, \ |
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BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \ |
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typedef ::boost::static_assert_test<\ |
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sizeof(::boost::STATIC_ASSERTION_FAILURE< \ |
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BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\ |
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BOOST_JOIN(boost_static_assert_typedef_, __LINE__) |
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#elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003) |
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// special version for CodeWarrior <= 8.x |
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#define BOOST_STATIC_ASSERT( B ) \ |
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BOOST_STATIC_CONSTANT(int, \ |
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BOOST_JOIN(boost_static_assert_test_, __LINE__) = \ |
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sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) ) |
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#else |
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// generic version |
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# ifndef BOOST_NO_CXX11_VARIADIC_MACROS |
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# define BOOST_STATIC_ASSERT( ... ) \ |
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typedef ::boost::static_assert_test<\ |
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sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >)>\ |
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BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_ATTRIBUTE_UNUSED |
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# else |
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# define BOOST_STATIC_ASSERT( B ) \ |
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typedef ::boost::static_assert_test<\ |
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sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\ |
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BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_ATTRIBUTE_UNUSED |
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# endif |
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#endif |
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#else |
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// alternative enum based implementation: |
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# ifndef BOOST_NO_CXX11_VARIADIC_MACROS |
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# define BOOST_STATIC_ASSERT( ... ) \ |
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enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \ |
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= sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( __VA_ARGS__ ) >) } |
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# else |
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# define BOOST_STATIC_ASSERT(B) \ |
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enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \ |
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= sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) } |
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# endif |
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#endif |
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#endif // defined(BOOST_NO_CXX11_STATIC_ASSERT) |
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#endif // BOOST_STATIC_ASSERT_HPP |
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