107 lines
2.8 KiB
Plaintext
107 lines
2.8 KiB
Plaintext
|
// (C) Copyright John Maddock 2015.
|
||
|
|
// Use, modification and distribution are subject to 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)
|
||
|
|
|
||
|
|
#ifndef BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP
|
||
|
|
#define BOOST_TYPE_TRAITS_INTEGRAL_CONSTANT_HPP
|
||
|
|
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/detail/workaround.hpp>
|
||
|
|
|
||
|
|
#if (BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400)) \
|
||
|
|
|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x610)) \
|
||
|
|
|| BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840)) \
|
||
|
|
|| BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202)) \
|
||
|
|
|| BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, BOOST_TESTED_AT(810)) )
|
||
|
|
|
||
|
|
|
||
|
|
namespace boost{
|
||
|
|
namespace mpl
|
||
|
|
{
|
||
|
|
template <bool B> struct bool_;
|
||
|
|
template <class I, I val> struct integral_c;
|
||
|
|
struct integral_c_tag;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
namespace mpl_{
|
||
|
|
|
||
|
|
template <bool B> struct bool_;
|
||
|
|
template <class I, I val> struct integral_c;
|
||
|
|
struct integral_c_tag;
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace boost
|
||
|
|
{
|
||
|
|
namespace mpl
|
||
|
|
{
|
||
|
|
using ::mpl_::bool_;
|
||
|
|
using ::mpl_::integral_c;
|
||
|
|
using ::mpl_::integral_c_tag;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
namespace boost{
|
||
|
|
|
||
|
|
template <class T, T val>
|
||
|
|
struct integral_constant
|
||
|
|
{
|
||
|
|
typedef mpl::integral_c_tag tag;
|
||
|
|
typedef T value_type;
|
||
|
|
typedef integral_constant<T, val> type;
|
||
|
|
static const T value = val;
|
||
|
|
//
|
||
|
|
// This helper function is just to disable type-punning
|
||
|
|
// warnings from GCC:
|
||
|
|
//
|
||
|
|
template <class U>
|
||
|
|
static U& dereference(U* p) { return *p; }
|
||
|
|
|
||
|
|
operator const mpl::integral_c<T, val>& ()const
|
||
|
|
{
|
||
|
|
static const char data[sizeof(long)] = { 0 };
|
||
|
|
return dereference(reinterpret_cast<const mpl::integral_c<T, val>*>(&data));
|
||
|
|
}
|
||
|
|
BOOST_CONSTEXPR operator T()const { return val; }
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class T, T val>
|
||
|
|
T const integral_constant<T, val>::value;
|
||
|
|
|
||
|
|
template <bool val>
|
||
|
|
struct integral_constant<bool, val>
|
||
|
|
{
|
||
|
|
typedef mpl::integral_c_tag tag;
|
||
|
|
typedef bool value_type;
|
||
|
|
typedef integral_constant<bool, val> type;
|
||
|
|
static const bool value = val;
|
||
|
|
//
|
||
|
|
// This helper function is just to disable type-punning
|
||
|
|
// warnings from GCC:
|
||
|
|
//
|
||
|
|
template <class T>
|
||
|
|
static T& dereference(T* p) { return *p; }
|
||
|
|
|
||
|
|
operator const mpl::bool_<val>& ()const
|
||
|
|
{
|
||
|
|
static const char data = 0;
|
||
|
|
return dereference(reinterpret_cast<const mpl::bool_<val>*>(&data));
|
||
|
|
}
|
||
|
|
BOOST_CONSTEXPR operator bool()const { return val; }
|
||
|
|
};
|
||
|
|
|
||
|
|
template <bool val>
|
||
|
|
bool const integral_constant<bool, val>::value;
|
||
|
|
|
||
|
|
typedef integral_constant<bool, true> true_type;
|
||
|
|
typedef integral_constant<bool, false> false_type;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|