Re: try..catch in Lua

[James Porter <porterj@...>]

Hu Qiwei wrote:
> Traditional pcall() and xpcall() behavior is intact. You can nest 
> pcall() and try..catch as you want.
> The difference is, you can call coroutine.yield() (or lua_yield in C) 
> in try..catch block. The implementation
> is platform independent. It uses setjmp...longjmp mechanism so it may 
> not be quite compatible with
> C++.

A while back, I made a patch to Lua to implement full C++ exception 
handling, primarily to ensure that exceptions passing through the Lua 
state don't put it in an inconsistent, well, state. At the time, I 
designed it to catch std::exceptions in pcalls and turn them into Lua 
errors, but I think it would be preferable to have try/catch available 
for things like that.

I'm not sure how likely it is that my exception-handling changes will 
get rolled into Lua proper, but I think these two patches would benefit 
from being merged into a single, more thorough patch.

If there's interest, I'll post my patch again, though I want to make a 
few small changes to it first.

- Jim