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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2026
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/int_types.h"
#include "td/utils/port/platform.h"
#include <type_traits>
namespace td {
template <class FunctionT>
struct member_function_class;
template <class ReturnType, class Type, class... Args>
struct member_function_class<ReturnType (Type::*)(Args...)> {
using type = Type;
static constexpr size_t argument_count() {
return sizeof...(Args);
}
};
template <class FunctionT>
using member_function_class_t = typename member_function_class<FunctionT>::type;
template <class FunctionT>
constexpr size_t member_function_argument_count() {
return member_function_class<FunctionT>::argument_count();
}
// there is no std::is_trivially_copyable in libstdc++ before 5.0
#if __GLIBCXX__
#if TD_CLANG || (TD_GCC && __GNUC__ >= 5) // but clang >= 3.0 and g++ >= 5.0 supports __is_trivially_copyable
#define TD_IS_TRIVIALLY_COPYABLE(T) __is_trivially_copyable(T)
#else
#define TD_IS_TRIVIALLY_COPYABLE(T) __has_trivial_copy(T)
#endif
#else
#define TD_IS_TRIVIALLY_COPYABLE(T) ::std::is_trivially_copyable<T>::value
#endif
} // namespace td
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