57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
// Copyright 2015 The Crashpad Authors. All rights reserved.
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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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#ifndef CRASHPAD_UTIL_STDLIB_MAP_INSERT_H_
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#define CRASHPAD_UTIL_STDLIB_MAP_INSERT_H_
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#include <map>
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#include <utility>
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namespace crashpad {
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//! \brief Inserts a mapping from \a key to \a value into \a map, or replaces
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//! an existing mapping so that \a key maps to \a value.
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//!
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//! This behaves similarly to `std::map<>::%insert_or_assign()` proposed for
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//! C++17, except that the \a old_value parameter is added.
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//!
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//! \param[in,out] map The map to operate on.
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//! \param[in] key The key that should be mapped to \a value.
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//! \param[in] value The value that \a key should map to.
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//! \param[out] old_value If \a key was previously present in \a map, this will
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//! be set to its previous value. This parameter is optional and may be
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//! `nullptr` if this information is not required.
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//!
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//! \return `false` if \a key was previously present in \a map. If \a old_value
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//! is not `nullptr`, it will be set to the previous value. `true` if \a
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//! key was not present in the map and was inserted.
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template <typename T>
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bool MapInsertOrReplace(T* map,
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const typename T::key_type& key,
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const typename T::mapped_type& value,
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typename T::mapped_type* old_value) {
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const auto result = map->insert(std::make_pair(key, value));
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if (!result.second) {
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if (old_value) {
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*old_value = result.first->second;
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}
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result.first->second = value;
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}
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return result.second;
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}
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_STDLIB_MAP_INSERT_H_
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