Re: [Boost-users] [program_options] Clearing variables_map

Subject: Re: [Boost-users] [program_options] Clearing variables_map
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2010-04-09 02:38:14

Jason Reich wrote:

> Hello,
> 
> I'm using boost::program_options to parse an command line within a running
> program (i.e. not just at startup, whenever a new command comes in), and am
> trying to avoid memory deallocation/reallocation.  Is there any way reuse a
> variable_map that has already had options stored into it?
> 
> If I use the std::map<>.clear() it seems to clear the stored values, but
> when I next try to parse, the results are still empty.  I think this is
> happening because the m_final variable (as far as I can understand).
> 
> Is there some reason why the variables_map can't be cleared and reused?

Why do you think that calling clear() and using the same variables_map again
will cut down on memory deallocation/reallocation? It does not seem obvious
to me that it will.

- Volodya