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author | Adam Midvidy <amidvidy@gmail.com> | 2015-11-18 12:08:06 -0500 |
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committer | Adam Midvidy <amidvidy@gmail.com> | 2015-11-18 15:10:50 -0500 |
commit | f59b2b7634b1c4c84e3f8f096a4e895986bf4d30 (patch) | |
tree | 7e59d9036edeffbb4caa583e9893c76d47d5f486 /src/mongo/util/itoa.h | |
parent | b097fd8b0740e903ef4bbb54ea1a8078be449c36 (diff) | |
download | mongo-f59b2b7634b1c4c84e3f8f096a4e895986bf4d30.tar.gz |
SERVER-21481 optimize generating indices in BSONArrayBuilder
Diffstat (limited to 'src/mongo/util/itoa.h')
-rw-r--r-- | src/mongo/util/itoa.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/mongo/util/itoa.h b/src/mongo/util/itoa.h new file mode 100644 index 00000000000..7d02f82400c --- /dev/null +++ b/src/mongo/util/itoa.h @@ -0,0 +1,57 @@ +/** + * Copyright (C) 2015 MongoDB Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License, version 3, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * As a special exception, the copyright holders give permission to link the + * code of portions of this program with the OpenSSL library under certain + * conditions as described in each individual source file and distribute + * linked combinations including the program with the OpenSSL library. You + * must comply with the GNU Affero General Public License in all respects for + * all of the code used other than as permitted herein. If you modify file(s) + * with this exception, you may extend this exception to your version of the + * file(s), but you are not obligated to do so. If you do not wish to do so, + * delete this exception statement from your version. If you delete this + * exception statement from all source files in the program, then also delete + * it in the license file. + */ + +#include <cstdint> + +#include "mongo/base/disallow_copying.h" +#include "mongo/base/string_data.h" + +namespace mongo { + +/** + * A utility class for performing itoa style integer formatting. This class is highly optimized + * and only really should be used in hot code paths. + */ +class ItoA { + MONGO_DISALLOW_COPYING(ItoA); + +public: + explicit ItoA(std::uint32_t i); + + operator StringData() { + return {_str, _len}; + } + +private: + const char* _str{nullptr}; + std::size_t _len{0}; + // 11 is provably the max size we need as int32_t max has 10 digits. + char _buf[11]; +}; + +} // namespace mongo |