47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/int_types.h"
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#include "td/utils/port/platform.h"
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#include <type_traits>
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namespace td {
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template <class FunctionT>
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struct member_function_class;
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template <class ReturnType, class Type, class... Args>
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struct member_function_class<ReturnType (Type::*)(Args...)> {
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using type = Type;
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static constexpr size_t argument_count() {
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return sizeof...(Args);
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}
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};
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template <class FunctionT>
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using member_function_class_t = typename member_function_class<FunctionT>::type;
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template <class FunctionT>
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constexpr size_t member_function_argument_count() {
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return member_function_class<FunctionT>::argument_count();
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}
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// there is no std::is_trivially_copyable in libstdc++ before 5.0
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#if __GLIBCXX__
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#if TD_CLANG || (TD_GCC && __GNUC__ >= 5) // but clang >= 3.0 and g++ >= 5.0 supports __is_trivially_copyable
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#define TD_IS_TRIVIALLY_COPYABLE(T) __is_trivially_copyable(T)
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#else
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#define TD_IS_TRIVIALLY_COPYABLE(T) __has_trivial_copy(T)
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#endif
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#else
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#define TD_IS_TRIVIALLY_COPYABLE(T) ::std::is_trivially_copyable<T>::value
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#endif
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} // namespace td
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