Re: adapter function for for_each
On Aug 20, 4:55 am, dominolog <dominiktomc...@gmail.com> wrote:
I've got following container:
std::vector<boost::shared_ptr<std::string> > strings;
strings.push_back( boost::shared_ptr<std::string> ( new
std::string("AAA") ) );
strings.push_back( boost::shared_ptr<std::string> ( new
std::string("BBB") ) );
strings.push_back( boost::shared_ptr<std::string> ( new
std::string("BBB") ) );
std::for_each( strings.begin(), strings.end(),
std::mem_fun( &std::length ) );
Now I want a 0-parameter method from std::string to be called on every
element from the sequence. I tried to use std::mem_fun (as above), but
it claims as follows:
cannot convert parameter 1 from 'boost::shared_ptr<T>' to 'const std::=
basic_string<_Elem,_Traits,_Ax> *'
The question is - how to construct a correct adapter for it, not using
a custom operand class. I want to use only stl stuff.
Since you're using Boost (or TR1), you can use boost::mem_fn (or
std::tr1::mem_fn) or boost::bind (or std::tr1::bind):
std::for_each( strings.begin(), strings.end(),
boost::mem_fn(&std::string::length));
Or
std::for_each( strings.begin(), strings.end(),
std::tr1::mem_fn(&std::string::length));
Or
std::for_each( strings.begin(), strings.end(),
boost::bind(&std::string::length, _1));
Or
std::for_each( strings.begin(), strings.end(),
std::tr1::bind(&std::string::length, std::tr1::placeholders::_1));
Cheers! --M