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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_ERROR_HXX
#define MPD_ERROR_HXX
#include "check.h"
#include "Compiler.h"
#include <string>
#include <utility>
#include <assert.h>
class Domain;
extern const Domain errno_domain;
#ifdef WIN32
/* fuck WIN32! */
#include <windows.h>
#define IgnoreError MPDIgnoreError
#undef GetMessage
/**
* Domain for GetLastError().
*/
extern const Domain win32_domain;
#endif
/**
* This class contains information about a runtime error.
*/
class Error {
const Domain *domain;
int code;
std::string message;
public:
Error():domain(nullptr), code(0) {}
Error(const Domain &_domain, int _code, const char *_message)
:domain(&_domain), code(_code), message(_message) {}
Error(const Domain &_domain, const char *_message)
:domain(&_domain), code(0), message(_message) {}
Error(Error &&other)
:domain(other.domain), code(other.code),
message(std::move(other.message)) {}
~Error();
Error(const Error &) = delete;
Error &operator=(const Error &) = delete;
Error &operator=(Error &&other) {
domain = other.domain;
code = other.code;
std::swap(message, other.message);
return *this;
}
bool IsDefined() const {
return domain != nullptr;
}
void Clear() {
domain = nullptr;
}
const Domain &GetDomain() const {
assert(IsDefined());
return *domain;
}
bool IsDomain(const Domain &other) const {
return domain == &other;
}
int GetCode() const {
assert(IsDefined());
return code;
}
const char *GetMessage() const {
assert(IsDefined());
return message.c_str();
}
void Set(const Error &other) {
assert(!IsDefined());
assert(other.IsDefined());
domain = other.domain;
code = other.code;
message = other.message;
}
void Set(const Domain &_domain, int _code, const char *_message);
void Set(const Domain &_domain, const char *_message) {
Set(_domain, 0, _message);
}
private:
void Format2(const Domain &_domain, int _code, const char *fmt, ...);
public:
template<typename... Args>
void Format(const Domain &_domain, int _code,
const char *fmt, Args&&... args) {
Format2(_domain, _code, fmt, std::forward<Args>(args)...);
}
template<typename... Args>
void Format(const Domain &_domain, const char *fmt, Args&&... args) {
Format2(_domain, 0, fmt, std::forward<Args>(args)...);
}
void AddPrefix(const char *prefix) {
message.insert(0, prefix);
}
void FormatPrefix(const char *fmt, ...);
void SetErrno(int e);
void SetErrno();
void SetErrno(int e, const char *prefix);
void SetErrno(const char *prefix);
void FormatErrno(const char *prefix, ...);
void FormatErrno(int e, const char *prefix, ...);
#ifdef WIN32
void SetLastError(const char *prefix);
#endif
};
/**
* Pass a temporary instance of this class to ignore errors.
*/
class IgnoreError final {
Error error;
public:
operator Error &() {
assert(!error.IsDefined());
return error;
}
};
#endif
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