I am using Dev-C++ and lambda expression.I wrote the following lines:

...................

typedef std::map<int, int> IIPrimemap;
IIPrimemap primemapvec;

......................

 void a(){
   primemapvec[1]=3;
   bind(&IIPrimemap::value_type::second,(*bind(static_cast<IIPrimemap::iterator (IIPrimemap::*)()> (&IIPrimemap::end),var(primemapvec))))++;
   return;

}
.....................

but after the program ran,

the primemapvec[1] is still 3, not 4.

I am puzzled about that.

How can I change primemapvec to 4 ?

Can anyone with kindness help me?