Exceptions.hpp

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#ifndef LOPER_EXCEPTIONS
#define LOPER_EXCEPTIONS

#include <stdarg.h>
#include <stdexcept>
#include <exception>
#include <stdio.h>



template< typename Super >
class ExceptionTemplate : public Super
{
public:
    ExceptionTemplate (const char *format, ...);
    ExceptionTemplate(FILE *fp, const char *format, ...);
    virtual const char *what() const;
private:
    std::string str;
};




typedef ExceptionTemplate< std::exception        > Error;
typedef ExceptionTemplate< std::logic_error      > LogicError;
typedef ExceptionTemplate< std::invalid_argument > ArgError;
typedef ExceptionTemplate< std::runtime_error    > RuntimeError;



/*******************************************************************
 *                       METHOD DEFINITIONS                        *
 *******************************************************************/


template< typename Super >
ExceptionTemplate< Super >::ExceptionTemplate (const char *format, ...) : Super("")
{
        va_list args; 
        char    buffer[512];
        va_start(args,format);
        _vsnprintf(buffer,sizeof(buffer)-1,format,args);
    va_end(args);
    str = buffer;
}



template< typename Super >
ExceptionTemplate< Super >::ExceptionTemplate< Super >(FILE *fp, const char *format, ...) : Super("")
{
        va_list args; 
        char    buffer[512];
        va_start(args,format);
        _vsnprintf(buffer,sizeof(buffer)-1,format,args);
    va_end(args);

    str = buffer;
    if (!fp) str += ": file i/o error (null file pointer)";
    else if (feof(fp)) str += ": reached end of file.";
    else if (ferror(fp)) str += ": error reading file.";
    else str += ": unknown error";
}



template< typename Super >
const char *ExceptionTemplate< Super >::what() const
{
    return str.c_str();
}


#endif // LOPER_EXCEPTIONS

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