Re: [boost] std::map::find() wrapper

Subject: Re: [boost] std::map::find() wrapper
From: Denis Shevchenko (for.dshevchenko_at_[hidden])
Date: 2011-04-20 15:14:03

20.04.2011 18:54, Olaf van der Spek пишет:
> Hi,
>
> I've written a small wrapper for std::map::find() (and map-like
> containers/ranges) that returns a pointer to the value if found (or
> NULL if not found).
>
> See https://svn.boost.org/trac/boost/ticket/5227
>
> The advantage is that you don't need the container type name (for
> ::reference), you can initialize the pointer inside an if condition,
> you don't have to compare against ::end() and you don't have to use
> ->second.
Hmm... Why not use map::at()?

Compare:

if (very_long_type_name_t::mapped_type* i = find_ptr(very_long_name, 1)) 
cout << *i << "\n";

with:

try {
cout << very_long_name.at( 1 ) << endl;
} catch ( const std::exception& /* exc */ ) {
cout << "No value with key 1" << endl;
}

You don't like exceptions?

- Denis