Re: [boost] [Boost.Regex] Not compiling without exceptions.

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-03-08 08:17:43

"Lars Gullik Bjønnes" wrote:
> In cpp_regex_traits.cpp line 76 there is a re-throw. This does not
> work when compiling without exceptions. [...]

> To allow compiling I did this:
>
> --- ../../boost/boost/throw_exception.hpp       2004-08-05
> 17:24:43.000000000 +0200 +++ boost/throw_exception.hpp   2005-03-08
> 03:04:27.066704153 +0100 @@ -32,6 +32,8 @@
>
> void throw_exception(std::exception const & e); // user defined
>
> +#define BOOST_THROW_EXCEPTION_AGAIN

throw_exception.hpp doesn't contain helper TRY/CATCH/RETHROW macros for two 
reasons:

1. Most non-g++ compilers accept the exception handling constructs in "no 
exceptions" mode;

2. The proper way to fix code that relies on catch(...)+throw is to 
introduce a RAII guard. This also helps with other catch(...)-related 
problems.

This reminds me that I need to fix shared_count.hpp to not contain a 
rethrow.

However, last time we discussed the issue, it was pointed out that the RAII 
way has performance implications compared to catch(...)+throw. This lead to 
detail/no_exception_support.hpp, which does contain a BOOST_RETHROW macro.