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/**
* Copyright (C) 2016, Wu Tao All rights reserved.
*
* bson is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* bson 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "DisallowCopying.h"
#include "Slice.h"
namespace bson {
// Status represents the result of an operation. It can be either a success or
// an error state.
//
class Status {
private:
enum ErrorCodes { kOK = 0, kFailedToParse = 1 };
public:
// Default Status is an OK status.
Status() = default;
// copyable
Status(const Status& rhs);
Status& operator=(const Status& rhs);
Status(Status&& rhs) : info_(rhs.info_.release()) {}
// Return an success state.
//
// The cost of creating an success state is much cheaper than an error state.
// The error information is generated only when the Status object is not an
// OK object, which contains merely a pointer.
//
static Status OK() {
return Status();
}
bool IsOK() const {
return code() == ErrorCodes::kOK;
}
explicit operator bool() const {
return IsOK();
}
static Status FailedToParse(const Slice& msg) {
return Status(ErrorCodes::kFailedToParse, msg);
}
bool IsFailedToParse() const {
return code() == ErrorCodes::kFailedToParse;
}
std::string ToString() const;
private:
Status(ErrorCodes errorCode, const Slice& msg)
: info_(new ErrorInfo(errorCode, msg)) {}
struct ErrorInfo {
unsigned char code;
std::string msg;
ErrorInfo(ErrorCodes c, const Slice& s)
: code(static_cast<unsigned char>(c)), msg(s.RawData(), s.Len()) {}
};
ErrorCodes code() const {
if (!info_)
return ErrorCodes::kOK;
return static_cast<ErrorCodes>(info_->code);
}
void copy(const Status&);
private:
std::unique_ptr<ErrorInfo> info_;
};
inline Status& Status::operator=(const Status& status) {
copy(status);
return (*this);
}
inline Status::Status(const Status& status) {
copy(status);
}
} // namespace bson