traits.hpp

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/*------------------------------------------------------------------------------
    Copyright Butterfly Energy Systems 2014-2015, 2022.
    Distributed under the Boost Software License, Version 1.0.
    http://www.boost.org/LICENSE_1_0.txt
------------------------------------------------------------------------------*/
 
#ifndef CPPWAMP_TRAITS_HPP
#define CPPWAMP_TRAITS_HPP
 
#include <tuple>
#include <type_traits>
#include <vector>
#include "api.hpp"
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
 
/* Hides EnableIf decorations in order to keep the generated Doxygen
   documentation clean. */
#ifdef CPPWAMP_FOR_DOXYGEN
#define CPPWAMP_ENABLE_IF(cond)
#define CPPWAMP_ENABLED_TYPE(type, cond) type
#else
#define CPPWAMP_ENABLE_IF(cond) EnableIf<(cond)>
#define CPPWAMP_ENABLED_TYPE(type, cond) EnableIf<(cond), type>
#endif
 
namespace wamp
{
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template<bool B, typename T = int>
using EnableIf = typename std::enable_if<B,T>::type;
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template<bool B, typename T = int>
using DisableIf = typename std::enable_if<!B,T>::type;
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template <typename T>
using ValueTypeOf =
    typename std::remove_cv<typename std::remove_reference<T>::type>::type;
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template<typename T, typename U>
CPPWAMP_API constexpr bool isSameType() {return std::is_same<T, U>::value;}
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template <typename T>
CPPWAMP_API constexpr bool isBool()
{
    // std::vector<bool>::const_reference is not just bool in clang/libc++.
    return isSameType<T, bool>() ||
           isSameType<T, std::vector<bool>::reference>() ||
           isSameType<T, std::vector<bool>::const_reference>();
}
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template <typename T>
CPPWAMP_API constexpr bool isNumber()
{
    return std::is_arithmetic<T>::value && !isSameType<T, bool>();
}
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template <typename T>
CPPWAMP_API constexpr bool isSignedInteger()
{
    return std::is_integral<T>::value && std::is_signed<T>::value &&
           !isSameType<T, bool>();
}
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template <typename T>
CPPWAMP_API constexpr bool isUnsignedInteger()
{
    return std::is_integral<T>::value && !std::is_signed<T>::value &&
           !isSameType<T, bool>();
}
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template<int N, typename... Ts> using NthTypeOf =
    typename std::tuple_element<N, std::tuple<Ts...>>::type;
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
template <bool B>
using BoolConstant = std::integral_constant<bool, B>;
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
using TrueType = BoolConstant<true>;
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
using FalseType = BoolConstant<false>;
 
} // namespace wamp
 
#endif // CPPWAMP_TRAITS_HPP