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initial commit, copy everything to new repository

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ado
2020-12-10 19:26:56 +01:00
parent 2c0a35acf9
commit 9d45ff7b62
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80
include/ss/function_traits.hpp Normal file
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#pragma once
#include <cstdlib>
#include <functional>
#include <tuple>
namespace ss {
////////////////
// function traits
////////////////
template <size_t N, typename T, typename... Ts>
struct decayed_arg_n {
static_assert(N - 1 != sizeof...(Ts), "index out of range");
using type = typename decayed_arg_n<N - 1, Ts...>::type;
};
template <typename T, typename... Ts>
struct decayed_arg_n<0, T, Ts...> {
using type = std::decay_t<T>;
};
template <typename T>
struct function_traits;
template <typename R, typename C, typename Arg>
struct function_traits<std::function<R(C&, const Arg&) const>> {
using arg_type = Arg;
};
template <typename R, typename... Ts>
struct function_traits<R(Ts...)> {
using arg0 = typename decayed_arg_n<0, Ts...>::type;
};
template <typename R, typename... Ts>
struct function_traits<R(Ts...) const> : function_traits<R(Ts...)> {};
template <typename R, typename... Ts>
struct function_traits<R(Ts...)&> : function_traits<R(Ts...)> {};
template <typename R, typename... Ts>
struct function_traits<R(Ts...) const&> : function_traits<R(Ts...)> {};
template <typename R, typename... Ts>
struct function_traits<R(Ts...) &&> : function_traits<R(Ts...)> {};
template <typename R, typename... Ts>
struct function_traits<R(Ts...) const&&> : function_traits<R(Ts...)> {};
template <typename MemberFunction>
struct member_wrapper;
template <typename R, typename T>
struct member_wrapper<R T::*> {
using arg_type = typename function_traits<R>::arg0;
};
////////////////
// has method
////////////////
#define INIT_HAS_METHOD(method) \
template <typename T> \
class has_m_##method { \
template <typename C> \
static std::true_type test(decltype(&C::method)); \
\
template <typename C> \
static std::false_type test(...); \
\
public: \
constexpr static bool value = decltype(test<T>(0))::value; \
}; \
\
template <typename T> \
constexpr bool has_m_##method##_t = has_m_##method<T>::value;
} /* trait */