Re: [Boost-users] [ptr_container] Pair type for boost::ptr_map?

From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2008-04-19 10:19:30

Nat Goodspeed skrev:
> Robert Dailey wrote:
> 
>> I have the following code:
>>
>> void HandlePair( std::pair<int, char*>& mypair )
>> {
>> }
>>
>> void main()
>> {
>>         boost::ptr_map<int, char> mymap;
>>         HandlePair( *mymap.begin() );
>> }
>>
>>
>> What's the proper way to accept pairs in the HandlePair function? 
> 
> I'd suggest basing it on your actual ptr_map type, e.g.:
> void HandlePair(const boost::ptr_map<int, char>::value_type& mypair) {}

Actually, using

void HandlePair(boost::ptr_map<int, char>::const_reference mypair);

is better, since the reference type is not a real reference. So
don't rely on map::reference to be equal to map::value_type&.

HTH

-Thorsten