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make has_size use has_xxx implementation

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[SVN r16303]
This commit is contained in:
Aleksey Gurtovoy
2002-11-17 08:10:16 +00:00
parent 70f4f35c91
commit a839cdecdb
1 changed files with 4 additions and 41 deletions
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45
include/boost/mpl/aux_/has_size.hpp
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@@ -17,47 +17,10 @@
#ifndef BOOST_MPL_AUX_HAS_SIZE_HPP_INCLUDED
#define BOOST_MPL_AUX_HAS_SIZE_HPP_INCLUDED
#include "boost/mpl/aux_/type_wrapper.hpp"
#include "boost/mpl/aux_/yes_no.hpp"
#include "boost/mpl/aux_/config/msvc_typename.hpp"
#include "boost/mpl/aux_/config/overload_resolution.hpp"
#include "boost/config.hpp"
#include "boost/mpl/aux_/has_xxx.hpp"
namespace boost {
namespace mpl {
namespace aux {
#if !defined(BOOST_MPL_BROKEN_OVERLOAD_RESOLUTION)
// the implementation below is based on a USENET newsgroup posting by
// Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
template< typename T >
yes_tag has_size_helper(type_wrapper<T>*, BOOST_MSVC_TYPENAME T::size*);
template< typename T >
no_tag has_size_helper(type_wrapper<T>*, ...);
template< typename T >
struct has_size
{
BOOST_STATIC_CONSTANT(bool, value =
sizeof(has_size_helper((type_wrapper<T>*)0, 0)) == sizeof(yes_tag)
);
};
#else
template< typename T >
struct has_size
{
BOOST_STATIC_CONSTANT(bool, value = false);
};
#endif
} // namespace aux
} // namespace mpl
} // namespace boost
namespace boost { namespace mpl { namespace aux {
BOOST_MPL_HAS_XXX_TRAIT_DEF(size)
}}}
#endif // BOOST_MPL_AUX_HAS_SIZE_HPP_INCLUDED