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/* Copyright 2012 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Utility functions for parsing numbers from strings.
*/
#pragma once
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/client/export_macros.h"
namespace mongo {
/**
* Parses a number out of a StringData.
*
* Parses "stringValue", interpreting it as a number of the given "base". On success, stores
* the parsed value into "*result" and returns Status::OK().
*
* Valid values for "base" are 2-36, with 0 meaning "choose the base by inspecting the prefix
* on the number", as in strtol. Returns Status::BadValue if an illegal value is supplied for
* "base".
*
* The entirety of the string must consist of digits in the given base, except optionally the
* first character may be "+" or "-", and hexadecimal numbers may begin "0x". Same as strtol,
* without the property of stripping whitespace at the beginning, and fails to parse if there
* are non-digit characters at the end of the string.
*
* See parse_number.cpp for the available instantiations, and add any new instantiations there.
*/
template <typename NumberType>
MONGO_CLIENT_API Status parseNumberFromStringWithBase(const StringData& stringValue, int base, NumberType* result);
template <typename NumberType>
static Status parseNumberFromString(const StringData& stringValue, NumberType* result) {
return parseNumberFromStringWithBase(stringValue, 0, result);
}
} // namespace mongo
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