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/*
* barrier -- mouse and keyboard sharing utility
* Copyright (C) 2012-2016 Symless Ltd.
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file LICENSE that should have accompanied this file.
*
* This package 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
#include "base/String.h"
#include "common/stdexcept.h"
//! Exception base class
/*!
This is the base class of most exception types.
*/
class XBase : public std::runtime_error {
public:
//! Use getWhat() as the result of what()
XBase();
//! Use \c msg as the result of what()
XBase(const String& msg);
virtual ~XBase() _NOEXCEPT;
//! Reason for exception
virtual const char* what() const _NOEXCEPT;
protected:
//! Get a human readable string describing the exception
virtual String getWhat() const throw() { return ""; }
//! Format a string
/*!
Looks up a message format using \c id, using \c defaultFormat if
no format can be found, then replaces positional parameters in
the format string and returns the result.
*/
virtual String format(const char* id,
const char* defaultFormat, ...) const throw();
private:
mutable String m_what;
};
/*!
\def XBASE_SUBCLASS
Convenience macro to subclass from XBase (or a subclass of it),
providing the c'tor taking a const String&. getWhat() is not
declared.
*/
#define XBASE_SUBCLASS(name_, super_) \
class name_ : public super_ { \
public: \
name_() : super_() { } \
name_(const String& msg) : super_(msg) { } \
virtual ~name_() _NOEXCEPT { } \
}
/*!
\def XBASE_SUBCLASS
Convenience macro to subclass from XBase (or a subclass of it),
providing the c'tor taking a const String&. getWhat() must be
implemented.
*/
#define XBASE_SUBCLASS_WHAT(name_, super_) \
class name_ : public super_ { \
public: \
name_() : super_() { } \
name_(const String& msg) : super_(msg) { } \
virtual ~name_() _NOEXCEPT { } \
\
protected: \
virtual String getWhat() const throw(); \
}
/*!
\def XBASE_SUBCLASS_FORMAT
Convenience macro to subclass from XBase (or a subclass of it),
providing the c'tor taking a const String&. what() is overridden
to call getWhat() when first called; getWhat() can format the
error message and can call what() to get the message passed to the
c'tor.
*/
#define XBASE_SUBCLASS_FORMAT(name_, super_) \
class name_ : public super_ { \
private: \
enum EState { kFirst, kFormat, kDone }; \
\
public: \
name_() : super_(), m_state(kDone) { } \
name_(const String& msg) : super_(msg), m_state(kFirst) { } \
virtual ~name_() _NOEXCEPT { } \
\
virtual const char* what() const _NOEXCEPT \
{ \
if (m_state == kFirst) { \
m_state = kFormat; \
m_formatted = getWhat(); \
m_state = kDone; \
} \
if (m_state == kDone) { \
return m_formatted.c_str(); \
} \
else { \
return super_::what(); \
} \
} \
\
protected: \
virtual String getWhat() const throw(); \
\
private: \
mutable EState m_state; \
mutable std::string m_formatted; \
}
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