mirror of
https://github.com/boostorg/smart_ptr.git
synced 2025-11-03 17:21:51 +01:00
77 lines
1.7 KiB
C++
77 lines
1.7 KiB
C++
|
#ifndef BOOST_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
|
||
|
|
#define BOOST_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
|
||
|
|
|
||
|
|
// MS compatible compilers support #pragma once
|
||
|
|
|
||
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
||
|
|
# pragma once
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// detail/sp_convertible.hpp
|
||
|
|
//
|
||
|
|
// Copyright 2008 Peter Dimov
|
||
|
|
//
|
||
|
|
// Distributed under the Boost Software License, Version 1.0.
|
||
|
|
// See accompanying file LICENSE_1_0.txt or copy at
|
||
|
|
// http://www.boost.org/LICENSE_1_0.txt
|
||
|
|
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
|
||
|
|
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( BOOST_NO_SFINAE )
|
||
|
|
# define BOOST_SP_NO_SP_CONVERTIBLE
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ < 303 )
|
||
|
|
# define BOOST_SP_NO_SP_CONVERTIBLE
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ < 0x600 )
|
||
|
|
# define BOOST_SP_NO_SP_CONVERTIBLE
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
|
||
|
|
|
||
|
|
namespace boost
|
||
|
|
{
|
||
|
|
|
||
|
|
namespace detail
|
||
|
|
{
|
||
|
|
|
||
|
|
template< class Y, class T > struct sp_convertible
|
||
|
|
{
|
||
|
|
typedef char (&yes) [1];
|
||
|
|
typedef char (&no) [2];
|
||
|
|
|
||
|
|
static yes f( T* );
|
||
|
|
static no f( ... );
|
||
|
|
|
||
|
|
enum _vt { value = sizeof( f( (Y*)0 ) ) == sizeof(yes) };
|
||
|
|
};
|
||
|
|
|
||
|
|
struct sp_empty
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
template< bool > struct sp_enable_if_convertible_impl;
|
||
|
|
|
||
|
|
template<> struct sp_enable_if_convertible_impl<true>
|
||
|
|
{
|
||
|
|
typedef sp_empty type;
|
||
|
|
};
|
||
|
|
|
||
|
|
template<> struct sp_enable_if_convertible_impl<false>
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
template< class Y, class T > struct sp_enable_if_convertible: public sp_enable_if_convertible_impl< sp_convertible< Y, T >::value >
|
||
|
|
{
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#endif // !defined( BOOST_SP_NO_SP_CONVERTIBLE )
|
||
|
|
|
||
|
|
#endif // #ifndef BOOST_DETAIL_SP_TYPEINFO_HPP_INCLUDED
|