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Diffstat (limited to '')
-rw-r--r-- | src/util/Error.hxx | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/src/util/Error.hxx b/src/util/Error.hxx new file mode 100644 index 000000000..1fcf46061 --- /dev/null +++ b/src/util/Error.hxx @@ -0,0 +1,162 @@ +/* + * 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 "gcc.h" + +#include <string> + +#include <assert.h> + +class Domain; + +extern const Domain errno_domain; + +#ifdef WIN32 +/* fuck WIN32! */ +#include <windows.h> +#define IgnoreError MPDIgnoreError +#undef GetMessage +#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, ...); +}; + +/** + * Pass a temporary instance of this class to ignore errors. + */ +class IgnoreError final { + Error error; + +public: + operator Error &() { + assert(!error.IsDefined()); + + return error; + } +}; + +#endif |