mirror of https://gitee.com/bigwinds/arangodb
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_ARITHMETIC_H
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#define ARANGOD_AQL_ARITHMETIC_H 1
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#include "Basics/Common.h"
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namespace arangodb {
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namespace aql {
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double stringToNumber(std::string const& value, bool& failed) noexcept;
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template <typename T>
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bool isUnsafeAddition(T l, T r) {
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return ((r > 0 && l > (std::numeric_limits<T>::max)() - r) ||
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(r < 0 && l < (std::numeric_limits<T>::min)() - r));
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}
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template <typename T>
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bool isUnsafeSubtraction(T l, T r) {
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return ((r > 0 && l < (std::numeric_limits<T>::min)() + r) ||
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(r < 0 && l > (std::numeric_limits<T>::max)() + r));
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}
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template <typename T>
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bool isUnsafeMultiplication(T l, T r) {
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if (l > 0) {
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if (r > 0) {
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if (l > ((std::numeric_limits<T>::max)() / r)) {
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return true;
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}
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} else {
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if (r < ((std::numeric_limits<T>::min)() / l)) {
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return true;
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}
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}
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} else {
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if (r > 0) {
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if (l < ((std::numeric_limits<T>::min)() / r)) {
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return true;
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}
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} else {
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if ((l != 0) && (r < ((std::numeric_limits<T>::max)() / l))) {
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return true;
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}
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}
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}
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return false;
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}
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template <typename T>
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bool isUnsafeDivision(T l, T r) {
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// note: the caller still has to check whether r is zero (division by zero)
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return (l == (std::numeric_limits<T>::min)() && r == -1);
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}
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} // namespace aql
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} // namespace arangodb
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#endif
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