forked from boostorg/mpl
116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/aux_/has_rebind.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2002
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#ifndef BOOST_MPL_AUX_HAS_REBIND_HPP_INCLUDED
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#define BOOST_MPL_AUX_HAS_REBIND_HPP_INCLUDED
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#include "boost/mpl/aux_/type_wrapper.hpp"
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#include "boost/mpl/aux_/yes_no.hpp"
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#include "boost/mpl/aux_/config/msvc_typename.hpp"
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#include "boost/mpl/aux_/config/overload_resolution.hpp"
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#include "boost/config.hpp"
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namespace boost {
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namespace mpl {
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namespace aux {
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#if !defined(BOOST_MPL_BROKEN_OVERLOAD_RESOLUTION)
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#if !defined(BOOST_MSVC) || BOOST_MSVC > 1300
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// the implementation below is based on a USENET newsgroup's posting by
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// Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
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template< typename T >
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yes_tag
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has_rebind_helper(type_wrapper<T>*, BOOST_MSVC_TYPENAME T::rebind*);
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template< typename T >
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no_tag
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has_rebind_helper(type_wrapper<T>*, ...);
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template< typename T >
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struct has_rebind
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{
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BOOST_STATIC_CONSTANT(bool, value =
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sizeof(has_rebind_helper((type_wrapper<T>*)0, 0))
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== sizeof(yes_tag)
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);
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};
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#else
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// agurt, 11/sep/02: MSVC version, based on a USENET newsgroup's posting by
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// John Madsen (comp.lang.c++.moderated, 1999-11-12 19:17:06 GMT);
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// note that the code is _not_ standard-conforming, but it works,
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// and it resolves some nasty ICE cases with the above implementation
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template< typename T, typename rebind = int >
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struct has_rebind : T
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{
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private:
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static no_tag test(int*);
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static yes_tag test(...);
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public:
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BOOST_STATIC_CONSTANT(bool, value =
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sizeof(test(static_cast<rebind*>(0))) != sizeof(no_tag)
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);
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};
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# define AUX_HAS_REBIND_SPEC(T) \
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template<> struct has_rebind<T,int> \
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{ \
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enum { value = false }; \
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}; \
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/**/
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AUX_HAS_REBIND_SPEC(void)
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AUX_HAS_REBIND_SPEC(bool)
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AUX_HAS_REBIND_SPEC(char)
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AUX_HAS_REBIND_SPEC(signed char)
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AUX_HAS_REBIND_SPEC(unsigned char)
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#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
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AUX_HAS_REBIND_SPEC(wchar_t)
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#endif
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AUX_HAS_REBIND_SPEC(signed short)
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AUX_HAS_REBIND_SPEC(unsigned short)
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AUX_HAS_REBIND_SPEC(signed int)
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AUX_HAS_REBIND_SPEC(unsigned int)
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AUX_HAS_REBIND_SPEC(signed long)
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AUX_HAS_REBIND_SPEC(unsigned long)
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AUX_HAS_REBIND_SPEC(float)
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AUX_HAS_REBIND_SPEC(double)
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AUX_HAS_REBIND_SPEC(long double)
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# undef AUX_HAS_REBIND_SPEC
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#endif // BOOST_MSVC > 1300
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#else
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template< typename T >
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struct has_rebind
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{
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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#endif
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} // namespace aux
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} // namespace mpl
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} // namespace boost
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#endif // BOOST_MPL_AUX_HAS_REBIND_HPP_INCLUDED
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