dev-cpp-users

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

[Daniel G. <sp...@ho...>]

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.

Daniel


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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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