128 lines
2.9 KiB
C++
128 lines
2.9 KiB
C++
#ifndef BOOST_QVM_ENABLE_IF_HPP_INCLUDED
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#define BOOST_QVM_ENABLE_IF_HPP_INCLUDED
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// Copyright 2008-2022 Emil Dotchevski and Reverge Studios, Inc.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// Boost enable_if library
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// Copyright 2003 (c) The Trustees of Indiana University.
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// Authors: Jaakko Jarvi (jajarvi at osl.iu.edu)
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// Jeremiah Willcock (jewillco at osl.iu.edu)
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// Andrew Lumsdaine (lums at osl.iu.edu)
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namespace boost { namespace qvm {
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template<typename T, typename R=void>
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struct enable_if_has_type
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{
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typedef R type;
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};
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template <bool B, class T = void>
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struct enable_if_c {
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typedef T type;
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};
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template <class T>
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struct enable_if_c<false, T> {};
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template <class Cond, class T = void>
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struct enable_if : public enable_if_c<Cond::value, T> {};
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template <bool B, class T>
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struct lazy_enable_if_c {
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typedef typename T::type type;
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};
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template <class T>
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struct lazy_enable_if_c<false, T> {};
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template <class Cond, class T>
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struct lazy_enable_if : public lazy_enable_if_c<Cond::value, T> {};
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template <bool B, class T = void>
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struct disable_if_c {
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typedef T type;
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};
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template <class T>
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struct disable_if_c<true, T> {};
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template <class Cond, class T = void>
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struct disable_if : public disable_if_c<Cond::value, T> {};
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template <bool B, class T>
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struct lazy_disable_if_c {
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typedef typename T::type type;
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};
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template <class T>
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struct lazy_disable_if_c<true, T> {};
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template <class Cond, class T>
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struct lazy_disable_if : public lazy_disable_if_c<Cond::value, T> {};
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////////////////////////////////////////////////
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// The types below are a copy of the original types above, to workaround MSVC-12 bugs.
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template<typename T, typename R=void>
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struct enable_if_has_type2
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{
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typedef R type;
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};
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template <bool B, class T = void>
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struct enable_if_c2 {
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typedef T type;
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};
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template <class T>
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struct enable_if_c2<false, T> {};
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template <class Cond, class T = void>
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struct enable_if2 : public enable_if_c2<Cond::value, T> {};
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template <bool B, class T>
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struct lazy_enable_if_c2 {
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typedef typename T::type type;
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};
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template <class T>
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struct lazy_enable_if_c2<false, T> {};
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template <class Cond, class T>
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struct lazy_enable_if2 : public lazy_enable_if_c2<Cond::value, T> {};
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template <bool B, class T = void>
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struct disable_if_c2 {
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typedef T type;
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};
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template <class T>
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struct disable_if_c2<true, T> {};
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template <class Cond, class T = void>
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struct disable_if2 : public disable_if_c2<Cond::value, T> {};
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template <bool B, class T>
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struct lazy_disable_if_c2 {
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typedef typename T::type type;
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};
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template <class T>
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struct lazy_disable_if_c2<true, T> {};
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template <class Cond, class T>
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struct lazy_disable_if2 : public lazy_disable_if_c2<Cond::value, T> {};
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} }
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#endif
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