Re: for_each loop on a map without a functor

On Jan 18, 3:41 pm, nguillot <nicolas.guil...@gmail.com> wrote:


Visual Sutdio 2005 compiles the following just fine:
=== begine code ===
#include <algorithm>
#include <map>

using namespace std;

typedef int k;

class d {
public:
   void setIntMember( int i ) { }
};

template < typename Pair, typename Op >
class CallFuncOn2nd_t {
   Op fn;
public:
   CallFuncOn2nd_t( Op fn ): fn(fn) { }
   typename Op::result_type operator()( Pair& v ) const {
      return fn( v.second );
   }
};

template < typename Pair, typename Op >
CallFuncOn2nd_t<Pair, Op> callFuncOn2nd( Op fn ) {
   return CallFuncOn2nd_t<Pair, Op>( fn );
}

typedef std::map<k, d> tMap;

int main(){
   tMap m;
   for_each(m.begin(), m.end(),
 
callFuncOn2nd<tMap::value_type>( bind2nd( mem_fun_ref( &d::setIntMember ),
4 ) ) );
}
=== end code ===