mirror of
https://github.com/badaix/snapcast
synced 2025-02-22 14:54:30 +01:00
139 lines
3.1 KiB
C++
139 lines
3.1 KiB
C++
/***
|
|
This file is part of snapcast
|
|
Copyright (C) 2014-2024 Johannes Pohl
|
|
|
|
This program 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.
|
|
|
|
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 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
|
|
|
|
// standard headers
|
|
#include <optional>
|
|
#include <string>
|
|
#include <system_error>
|
|
#include <variant>
|
|
|
|
|
|
namespace snapcast
|
|
{
|
|
|
|
/// Error codes with detail information
|
|
struct ErrorCode : public std::error_code
|
|
{
|
|
/// c'tor
|
|
ErrorCode() : std::error_code(), detail_(std::nullopt)
|
|
{
|
|
}
|
|
|
|
/// c'tor
|
|
/// @param code the std error code
|
|
ErrorCode(const std::error_code& code) : std::error_code(code), detail_(std::nullopt)
|
|
{
|
|
}
|
|
|
|
/// c'tor
|
|
/// @param code the std error code
|
|
/// @param detail additional details
|
|
ErrorCode(const std::error_code& code, std::string detail) : std::error_code(code), detail_(std::move(detail))
|
|
{
|
|
}
|
|
|
|
/// Move c'tor
|
|
ErrorCode(ErrorCode&& other) = default;
|
|
/// Move assignment
|
|
ErrorCode& operator=(ErrorCode&& rhs) = default;
|
|
|
|
/// @return detaiöed error message
|
|
std::string detailed_message() const
|
|
{
|
|
if (detail_.has_value())
|
|
return message() + ": " + *detail_;
|
|
return message();
|
|
}
|
|
|
|
private:
|
|
/// Optional error detais
|
|
std::optional<std::string> detail_;
|
|
};
|
|
|
|
|
|
/// Storage for an ErrorCode or a type T
|
|
/// Mostly used as return type
|
|
template <class T>
|
|
struct ErrorOr
|
|
{
|
|
/// Move construct with @p t
|
|
ErrorOr(T&& t) : var(std::move(t))
|
|
{
|
|
}
|
|
|
|
/// Construct with @p t
|
|
ErrorOr(const T& t) : var(t)
|
|
{
|
|
}
|
|
|
|
/// Move construct with an error
|
|
ErrorOr(ErrorCode&& error) : var(std::move(error))
|
|
{
|
|
}
|
|
|
|
/// Construct with an error
|
|
ErrorOr(const ErrorCode& error) : var(error)
|
|
{
|
|
}
|
|
|
|
/// @return true if contains a value (i.e. no error)
|
|
bool hasValue()
|
|
{
|
|
return std::holds_alternative<T>(var);
|
|
}
|
|
|
|
/// @return true if contains an error (i.e. no value)
|
|
bool hasError()
|
|
{
|
|
return std::holds_alternative<ErrorCode>(var);
|
|
}
|
|
|
|
/// @return the value
|
|
const T& getValue()
|
|
{
|
|
return std::get<T>(var);
|
|
}
|
|
|
|
/// @return the moved value
|
|
T takeValue()
|
|
{
|
|
return std::move(std::get<T>(var));
|
|
}
|
|
|
|
/// @return the error
|
|
const ErrorCode& getError()
|
|
{
|
|
return std::get<ErrorCode>(var);
|
|
}
|
|
|
|
/// @return the moved error
|
|
ErrorCode takeError()
|
|
{
|
|
auto ec = std::move(std::get<ErrorCode>(var));
|
|
return ec;
|
|
}
|
|
|
|
private:
|
|
/// The stored ErrorCode or value
|
|
std::variant<ErrorCode, T> var;
|
|
};
|
|
|
|
|
|
} // namespace snapcast
|