From: Joel de Guzman (djowel_at_[hidden])
Date: 2002-10-12 00:28:47
----- Original Message -----
From: "Carl Daniel" <cpdaniel_at_[hidden]>
> More nits:
> Exception classes thrown by Spirit (parser_error<>, illegal_backtracking)
> don't derive from std::exception - shouldn't they?
I'm not sure. Should it? What will be the benefits in doing so?
The truth is, I'm not quite happy with the standard C++ exceptions.
For one, it's hard coded the what() to be a string.
Perhaps the language lawyers will correct me if I'm lost. :-)
> parser_error<> derives from parser_error_base, but illegal_backtracking
> (multi_pass.hpp) doesn't - shouldn't it?
Multi-pass is designed to be independent from Spirit. Doing
so will make it dependent.
> fixed_size_queue (usable with multi_pass_iterator) silently fails if too
> much source text is pushed. Wouldn't throwing an exception be more
The fixed sized queue is designed to be used in cases where the lookahead
is known. There are lots of grammars that require only very limited lookahead
for example; many times, only 1. In such cases, a fixed lookahead is
guaranteed not to be overrun. fixed_size_queue is optional however.
If the user is unsure, she can always use the std::queue.
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