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/*
* Copyright (C) 2013 Max Kellermann <max@duempel.org>
*
* 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.
*
* 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
* FOUNDATION 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 ERROR_HXX
#define 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);
}
gcc_printf(2,3)
void FormatPrefix(const char *fmt, ...);
void SetErrno(int e);
void SetErrno();
void SetErrno(int e, const char *prefix);
void SetErrno(const char *prefix);
gcc_printf(2,3)
void FormatErrno(const char *prefix, ...);
gcc_printf(3,4)
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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