41 рядки
1.1 KiB
C++
41 рядки
1.1 KiB
C++
#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;
|
|
|
|
template <std::size_t Index> using argument = typename std::tuple_element<Index, std::tuple<Arguments...>>::type;
|
|
|
|
static const std::size_t arity = sizeof...(Arguments);
|
|
};
|
|
|
|
} // namespace utility
|
|
} // namespace sqlite
|