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Re: TRY_CATCH()


Andrew Cagney wrote:

PS: I recall this being proposed years ago, but the mechanism proposed at the time had a more cumbersom syntax, from memory something like:

TRY_BEGIN
... do stuff ...
TRY_END;



I saw something similar to this that worked really well but was not quite as generic. Basically you would have to add a 'TryStack' member to whatever data structure you were planning to capture exceptions on. The TryStack was a stack of jmp_bufs. Then you'd do something like


if((error = TRY(mystruct)) == 0){
   do_stuff(mystruct);
   TRY_END(mystruct->try_stack);
}
else{
   CATCH(mystruct, error);
   handle_error();
}

The TRY would push a new jmp_buf onto the TryStack and the TRY_END and CATCH would pop one. The various macros would be like #define TRY(foo) is try_push(foo->try_stack) and so on. It's actually quite clever: If something THROWs, it also pops but CATCH only pops if the error value is zero so that you can have multiple tries and catches on a single block.

Anyway, interesting stuff.

cheers,

Kris


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