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#pragma once
#include "function.hpp"
#include <utility>
template <typename>
struct remove_cv_seq;
template <typename Return, typename... Args>
struct remove_cv_seq<Return(Args...)>
{
using type = Return(Args...);
};
template <typename Return, typename... Args>
struct remove_cv_seq<Return(Args...) const>
{
using type = Return(Args...);
};
template <typename Return, typename... Args>
struct remove_cv_seq<Return(Args...) &>
{
using type = Return(Args...);
};
template <typename Function>
constexpr inline auto extract_signature(Function * /*unused*/) noexcept
{
return Signature<typename remove_cv_seq<Function>::type>();
}
template <typename Class, typename Function>
constexpr inline auto extract_signature(Function Class::* /*unused*/) noexcept
{
return Signature<typename remove_cv_seq<Function>::type>();
}
template <typename Function>
constexpr inline auto extract_signature(Function const & /*unused*/) noexcept
-> decltype(&Function::operator(), extract_signature(&Function::operator()))
{
return extract_signature(&Function::operator());
}
template <typename Function, typename Return, typename... Args>
inline auto
get_normalized_lambda(Function &&func, Signature<Return(Args...)> /*unused*/) noexcept
{
// Static copy of func. This will make it accessible for the lambda without using a
// lamda capture
static auto static_func = Function(std::forward<Function>(func));
return +[](Args... args) noexcept(noexcept(std::declval<Function>(
)(std::forward<Args>(args)...))) -> Return
{
return static_func(std::forward<Args>(args)...);
};
}
/**
* Normalizes the type signature of a lambda function.
*
* This will make a lambda with captures passable to other functions.
*
* @param func A lambda function
* @returns The lambda function normalized.
*/
template <typename Function>
constexpr auto normalize_lambda(Function &&func) noexcept
{
return get_normalized_lambda(
std::forward<Function>(func),
extract_signature(std::forward<Function>(func))
);
}
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