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/*******************************************************************************
* shroudBNC - an object-oriented framework for IRC *
* Copyright (C) 2005-2014 Gunnar Beutner *
* *
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
*******************************************************************************/
#ifndef RESULT_H
#define RESULT_H
/**
* CResult<Type>
*
* A wrapper class for results and error codes.
*/
template<typename Type>
class CResult {
private:
Type m_Result; /**< the actual result */
unsigned int m_Code; /**< an error code, or 0 if no error occured */
const char *m_Description; /**< a human-readable description of the error */
public:
/**
* CResult
*
* Constructs a result object which represents a default result.
*/
CResult(void) {
memset(&m_Result, 0, sizeof(m_Result));
m_Code = 0;
m_Description = NULL;
}
/**
* CResult
*
* The copy-constructor for result objects.
*
* @param Source the source object.
*/
CResult(const CResult<Type> &Source) {
m_Code = Source.m_Code;
m_Result = Source.m_Result;
m_Description = Source.m_Description;
}
/**
* CResult
*
* Wraps a result value in a CResult object.
*
* @param Result the result value
*/
explicit CResult(const Type Result) {
m_Code = 0;
m_Description = NULL;
m_Result = Result;
}
/**
* CResult
*
* Constructs a new result object which represents an error.
*
* @param Code an error code
* @param Description a description for the error
*/
CResult(unsigned int Code, const char *Description) {
if (Code != 0) {
m_Code = Code;
} else {
m_Code = 1;
}
m_Description = Description;
memset(&m_Result, 0, sizeof(Type));
}
/**
* GetCode
*
* Returns the error code of a result object.
*/
unsigned int GetCode(void) const {
return m_Code;
}
/**
* GetDescription
*
* Returns the error description of the result object.
*/
const char *GetDescription(void) const {
return m_Description;
}
/**
* GetResult
*
* Returns a reference to the underlying result.
*/
Type &GetResult(void) {
return m_Result;
}
/**
* operator Type &
*
* Returns a reference to the underlying result.
*/
operator Type &(void) {
return m_Result;
}
};
/**
* IsError<Type>
*
* Checks whether a result object represents an error.
*
* @param Result the result object
*/
template<typename Type>
bool IsError(const CResult<Type> &Result) {
unsigned int Code;
Code = Result.GetCode();
return (Code != 0);
}
// some macros for using CResult objects
#define RESULT CResult
#define RETURN(Type, Result) do { CResult<Type> cResult(Result); return cResult; } while (0)
#define THROW(Type, Code, Description) do { CResult<Type> cResult(Code, Description); return cResult; } while (0)
#define THROWRESULT(Type, Result) do { assert(IsError(Result)); CResult<Type> cResult(Result.GetCode(), Result.GetDescription()); if (IsError(Result)) { return cResult; } } while (0)
#define THROWIFERROR(Type, Result) do { CResult<Type> cResult(Result.GetCode(), Result.GetDescription()); if (IsError(Result)) { return cResult; } } while (0)
#define ASSERTRESULT(Result) assert(!IsError(Result))
#define GETCODE(Result) Result.GetCode()
#define GETDESCRIPTION(Result) Result.GetDescription()
#define NEWERROR(Type, Code, Description) CResult<Type>(Code, Description)
/**
* generic_error_t
*
* Commonly used error codes.
*/
typedef enum generic_error_e {
Generic_OutOfMemory = 5000,
Generic_InvalidArgument,
Generic_QuotaExceeded,
Generic_Unknown
} generic_error_t;
#ifdef SWIGINTERFACE
%template(CResultCharP) CResult<char *>;
%template(CResultConstCharP) CResult<const char *>;
%template(CResultBool) CResult<bool>;
#endif /* SWIGINTERFACE */
#endif /* RESULT_H */
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