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/*
* Copyright (c) 2009-2020, Albertas Vyšniauskas
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* * Neither the name of the software author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GPICK_COMMON_RESULT_H_
#define GPICK_COMMON_RESULT_H_
#include <utility>
namespace common {
template<typename ValueT, typename ErrorT> struct Result {
Result():
m_status(false) {
}
Result(const ErrorT &error):
m_error(error),
m_status(false) {
}
Result(const ValueT &value):
m_value(value),
m_status(true) {
}
Result(ErrorT &&error):
m_error(std::move(error)),
m_status(false) {
}
Result(ValueT &&value):
m_value(std::move(value)),
m_status(true) {
}
Result(const Result &) = delete;
Result(Result &&result):
m_value(std::move(result.m_value)),
m_error(std::move(result.m_error)),
m_status(result.m_status) {
}
Result &operator=(const Result &) = delete;
Result &operator=(Result &&result) {
m_status = result.m_status;
m_value = std::move(result.m_value);
m_error = std::move(result.m_error);
return *this;
}
~Result() {
}
operator bool() const {
return m_status;
}
const ValueT &value() const {
return m_value;
}
ValueT &value() {
return m_value;
}
const ErrorT &error() const {
return m_error;
}
ErrorT &error() {
return m_error;
}
private:
ValueT m_value;
ErrorT m_error;
bool m_status;
};
template<typename BothT> struct Result<BothT, BothT> {
Result():
m_status(false) {
}
Result(bool status, const BothT &value):
m_value(value),
m_status(status) {
}
Result(bool status, BothT &&value):
m_value(std::move(value)),
m_status(status) {
}
Result(const Result &) = delete;
Result(Result &&result):
m_value(std::move(result.m_value)),
m_status(result.m_status) {
}
Result &operator=(const Result &) = delete;
Result &operator=(Result &&result) {
m_value = std::move(result.m_value);
return *this;
}
~Result() {
}
operator bool() const {
return m_status;
}
const BothT &value() const {
return m_value;
}
BothT &value() {
return m_value;
}
const BothT &error() const {
return m_value;
}
BothT &error() {
return m_value;
}
private:
BothT m_value;
bool m_status;
};
template<typename ErrorT> struct Result<void, ErrorT> {
Result():
m_status(true) {
}
Result(const ErrorT &error):
m_error(error),
m_status(false) {
}
Result(ErrorT &&error):
m_error(std::move(error)),
m_status(false) {
}
Result(const Result &) = delete;
Result(Result &&result):
m_error(std::move(result.m_error)),
m_status(result.m_status) {
}
Result &operator=(const Result &) = delete;
Result &operator=(Result &&result) {
m_error = std::move(result.m_error);
return *this;
}
~Result() {
}
operator bool() const {
return m_status;
}
const ErrorT &error() const {
return m_error;
}
ErrorT &error() {
return m_error;
}
private:
ErrorT m_error;
bool m_status;
};
template<typename ValueT> struct Result<ValueT, void> {
Result():
m_status(false) {
}
Result(const ValueT &value):
m_value(value),
m_status(true) {
}
Result(ValueT &&value):
m_value(std::move(value)),
m_status(true) {
}
Result(const Result &) = delete;
Result(Result &&result):
m_value(std::move(result.m_value)),
m_status(result.m_status) {
}
Result &operator=(const Result &) = delete;
Result &operator=(Result &&result) {
m_value = std::move(result.m_value);
return *this;
}
~Result() {
}
operator bool() const {
return m_status;
}
const ValueT &value() const {
return m_value;
}
ValueT &value() {
return m_value;
}
private:
ValueT m_value;
bool m_status;
};
template<typename ErrorT> using ResultVoid = struct Result<void, ErrorT>;
}
#endif /* GPICK_COMMON_RESULT_H_ */
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