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#pragma once
#include <tuple>
#include<type_traits>
namespace sqlite {
namespace utility {
template<typename> struct function_traits;
template <typename Function>
struct function_traits : public function_traits<
decltype(&std::remove_reference<Function>::type::operator())
> { };
template <
typename ClassType,
typename ReturnType,
typename... Arguments
>
struct function_traits<
ReturnType(ClassType::*)(Arguments...) const
> : function_traits<ReturnType(*)(Arguments...)> { };
/* support the non-const operator ()
* this will work with user defined functors */
template <
typename ClassType,
typename ReturnType,
typename... Arguments
>
struct function_traits<
ReturnType(ClassType::*)(Arguments...)
> : function_traits<ReturnType(*)(Arguments...)> { };
template <
typename ReturnType,
typename... Arguments
>
struct function_traits<
ReturnType(*)(Arguments...)
> {
typedef ReturnType result_type;
using argument_tuple = std::tuple<Arguments...>;
template <std::size_t Index>
using argument = typename std::tuple_element<
Index,
argument_tuple
>::type;
static const std::size_t arity = sizeof...(Arguments);
};
}
}
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