enable_if.hpp
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#ifndef BOOST_QVM_ENABLE_IF_HPP_INCLUDED
#define BOOST_QVM_ENABLE_IF_HPP_INCLUDED
// Copyright 2008-2022 Emil Dotchevski and Reverge Studios, Inc.
// 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)
// Boost enable_if library
// Copyright 2003 (c) The Trustees of Indiana University.
// Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)
// Jeremiah Willcock (jewillco at osl.iu.edu)
// Andrew Lumsdaine (lums at osl.iu.edu)
namespace boost { namespace qvm {
template<typename T, typename R=void>
struct enable_if_has_type
{
typedef R type;
};
template <bool B, class T = void>
struct enable_if_c {
typedef T type;
};
template <class T>
struct enable_if_c<false, T> {};
template <class Cond, class T = void>
struct enable_if : public enable_if_c<Cond::value, T> {};
template <bool B, class T>
struct lazy_enable_if_c {
typedef typename T::type type;
};
template <class T>
struct lazy_enable_if_c<false, T> {};
template <class Cond, class T>
struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {};
template <bool B, class T = void>
struct disable_if_c {
typedef T type;
};
template <class T>
struct disable_if_c<true, T> {};
template <class Cond, class T = void>
struct disable_if : public disable_if_c<Cond::value, T> {};
template <bool B, class T>
struct lazy_disable_if_c {
typedef typename T::type type;
};
template <class T>
struct lazy_disable_if_c<true, T> {};
template <class Cond, class T>
struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {};
////////////////////////////////////////////////
// The types below are a copy of the original types above, to workaround MSVC-12 bugs.
template<typename T, typename R=void>
struct enable_if_has_type2
{
typedef R type;
};
template <bool B, class T = void>
struct enable_if_c2 {
typedef T type;
};
template <class T>
struct enable_if_c2<false, T> {};
template <class Cond, class T = void>
struct enable_if2 : public enable_if_c2<Cond::value, T> {};
template <bool B, class T>
struct lazy_enable_if_c2 {
typedef typename T::type type;
};
template <class T>
struct lazy_enable_if_c2<false, T> {};
template <class Cond, class T>
struct lazy_enable_if2 : public lazy_enable_if_c2<Cond::value, T> {};
template <bool B, class T = void>
struct disable_if_c2 {
typedef T type;
};
template <class T>
struct disable_if_c2<true, T> {};
template <class Cond, class T = void>
struct disable_if2 : public disable_if_c2<Cond::value, T> {};
template <bool B, class T>
struct lazy_disable_if_c2 {
typedef typename T::type type;
};
template <class T>
struct lazy_disable_if_c2<true, T> {};
template <class Cond, class T>
struct lazy_disable_if2 : public lazy_disable_if_c2<Cond::value, T> {};
} }
#endif