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8.3.0
Source Code Documentation
add_with_saturate.h
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#ifndef INCLUDE_ADD_WITH_SATURATE_H_
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#define INCLUDE_ADD_WITH_SATURATE_H_
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/*
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Copyright (c) 2018, 2023, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file include/add_with_saturate.h
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Some utilities for saturating add.
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*/
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#include <limits>
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#include <type_traits>
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// Returns a + b, saturated to the range of a.
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template
<
class
T,
class
U>
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inline
T
AddWithSaturate
(T a,
U
b) {
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static_assert
(!std::is_signed<T>::value,
"values must be unsigned"
);
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static_assert
(!std::is_signed<U>::value,
"values must be unsigned"
);
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auto
result
= a + b;
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if
(
result < a || result >
std::numeric_limits<T>::max()) {
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// Value wrapped around or was promoted to a larger type; saturate to the
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// maximum value.
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return
std::numeric_limits<T>::max();
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}
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return
result
;
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}
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// Effectively does b += a; with saturation.
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template
<
class
T,
class
U>
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inline
void
AddWithSaturate
(T a,
U
*b) {
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*b =
AddWithSaturate
(*b, a);
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}
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#endif
// INCLUDE_ADD_WITH_SATURATE_H_
AddWithSaturate
T AddWithSaturate(T a, U b)
Definition:
add_with_saturate.h:37
result
struct result result
Definition:
result.h:33
result
Definition:
result.h:29
U
Definition:
dtoa.cc:588
include
add_with_saturate.h
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