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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 "mongo/platform/basic.h"
#include <string>
#include "mongo/base/system_error.h"
namespace mongo {
namespace {
/**
* A std::error_category for the codes in the named ErrorCodes space.
*/
class MongoErrorCategoryImpl final : public std::error_category {
public:
MongoErrorCategoryImpl() = default;
const char* name() const noexcept override {
return "mongo";
}
std::string message(int ev) const override {
return ErrorCodes::errorString(ErrorCodes::Error(ev));
}
// We don't really want to override this function, but to override the second we need to,
// otherwise there will be issues with overload resolution.
bool equivalent(const int code, const std::error_condition& condition) const noexcept override {
return std::error_category::equivalent(code, condition);
}
bool equivalent(const std::error_code& code, int condition) const noexcept override {
switch (ErrorCodes::Error(condition)) {
case ErrorCodes::OK:
// Make ErrorCodes::OK to be equivalent to the default constructed error code.
return code == std::error_code();
default:
return false;
}
}
};
} // namespace
const std::error_category& mongoErrorCategory() {
// TODO: Remove this static, and make a constexpr instance when we move to C++14.
static const MongoErrorCategoryImpl instance{};
return instance;
}
std::error_code make_error_code(ErrorCodes::Error code) {
return std::error_code(ErrorCodes::Error(code), mongoErrorCategory());
}
std::error_condition make_error_condition(ErrorCodes::Error code) {
return std::error_condition(ErrorCodes::Error(code), mongoErrorCategory());
}
} // namespace mongo
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