44 lines
1.0 KiB
C++
44 lines
1.0 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2011-2018 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include <type_traits>
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///////////////////////////////////////////////////////////////////////////////
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/// Forwards the supplied `value` and annotates the result as likely to be the
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/// value `typical`.
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///
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/// Must be an integral type.
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template <typename T, typename = std::enable_if_t<std::is_integral_v<T>>>
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constexpr inline
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T
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expect (T val, T typical)
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{
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return __builtin_expect (val, typical);
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}
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/// Coerces the argument into a bool and annotates the result as likely to be
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/// true.
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template <typename T>
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constexpr inline
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bool
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likely (T &&t)
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{ return __builtin_expect (!!t, true); }
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/// Coerces the argument into a bool and annotates the result as likely to be
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/// false.
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template <typename T>
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constexpr inline
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bool
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unlikely (T &&t)
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{ return __builtin_expect (!!t, false); }
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