logical.hpp

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#ifndef SHARE_METAPROGRAMMING_LOGICAL_HPP
#defineSHARE_METAPROGRAMMING_LOGICAL_HPP

// Stand-ins for C++17 logical operations on types.

#include<type_traits>

// Stand-in for C++17 std::bool_constant<value>.
template<bool Value>
using BoolConstant = std::integral_constant<bool, Value>;

// Stand-in for C++17 std::conjunction<T...>
template<typename... T>
structConjunction : publicstd::true_type {};

template<typename T1>
structConjunction<T1> : public T1 {};

template<typename T1, typename... T>
structConjunction<T1, T...> :
 public std::conditional_t<bool(T1::value), Conjunction<T...>, T1>
{};

// Stand-in for C++17 std::disjunction<T...>.
template<typename... T>
structDisjunction : publicstd::false_type {};

template<typename T1>
structDisjunction<T1> : public T1 {};

template<typename T1, typename... T>
structDisjunction<T1, T...> :
 public std::conditional_t<bool(T1::value), T1, Disjunction<T...>>
{};

// Stand-in for C++17 std::negation<T>.
template<typename T>
using Negation = BoolConstant<!bool(T::value)>;

#endif// SHARE_METAPROGRAMMING_LOGICAL_HPP