Re: [Boost-users] bind: what am I doing wrong here?

Subject: Re: [Boost-users] bind: what am I doing wrong here?
From: Noah Roberts (roberts.noah_at_[hidden])
Date: 2009-04-15 12:02:17

Peter Dimov wrote:
> Noah Roberts:
> 
>>   // won't compile:
>>   std::transform(m.begin(), m.end(), keys.begin(), 
>> boost::bind(&std::pair<std::string,Test>::first, _1));
> 
> The value type of the map m is pair<string const, Test> - note the 
> const. Use the value_type typedef:
> 
> typedef std::map<std::string, Test> map_type;
> 
> std::transform( m.begin(), m.end(), keys.begin(),
>    boost::bind(&map_type::value_type::first, _1) );

It would be something basic.  Thanks.