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ircd::util: Add pre-c++2a identity functor template.
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include/ircd/util/identity.h
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34
include/ircd/util/identity.h
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// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_IDENTITY_H
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namespace ircd
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{
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inline namespace util
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{
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struct identity;
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}
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}
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struct ircd::util::identity
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{
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template<class T>
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constexpr T&& operator()(T&& t) const noexcept;
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};
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template<class T>
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constexpr inline T&&
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ircd::util::identity::operator()(T&& t)
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const noexcept
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{
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return std::forward<T>(t);
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}
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@ -31,6 +31,7 @@ namespace ircd
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#define IRCD_UNIQUE(a) IRCD_CONCAT(a, __COUNTER__)
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#include "typography.h"
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#include "identity.h"
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#include "unit_literal.h"
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#include "construction.h"
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#include "unwind.h"
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