Re: [Dev-C++] Creating a basic exception class

[Teodorescu C. <te...@xt...>]

Daniel Glenfield wrote:

>
> Hi everyone,
> I want to create a basic exception class so my constructors can throw 
> objects if they fail. Constructors will be the only things that throw 
> exceptions, but the class will most likely be expanded in the future 
> so other functions can throw.
>
> What do I need to include in an exception class? I think an error log 
> text file would be good (I've done them before using ofstream objects) 
> but what data members should the file have? I've not done these before 
> so any suggestions would be great.

this is my exception class and usually i have a function that write 
exception and time stamp into a log file
class Exception{
    int no    /*<0*/
    string   msg  /*Optional */
    string GetMessage(int no);//get the message for that exception from 
a file .... use when multiple languages
    string function /* only in debug mode  function who throw exception */
}
how to use it
function dummy (int x )
{
    if (x<0){   
        Exception x;
        x.no=-10;
        x.function=dummy
        throw x;  
    };
}

function dummy2 ( ...)
{
    try {
        dummy(-1)
    }catch(Exception ex){
        //do clean up       
        //log and ...
    };
};
if  you use it in classes constructor
 ....
try {
//here constructor is called;
    my_class a;

}catch(Exception x)
{
};
Don't try this.
Don't throw exception in constructor;
I ussualy use a tricky way  
My class have function init who throw exception.
and if this fail ... cleanup and stuff.

>
> Daniel
>
>
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