What is the easiest way to "cast" a member function pointer to a function pointer in C ++?

Question

I want to provide a member function for the "comp" parameter for an STL algorithm such as lower_bound (..., Compare comp). The comp () function refers to a non-stationary element, so it must be a non-stationary member, but the type of non-static pointer of a user function is different from the type of a regular function pointer.

What is the best way to solve this problem?

Answer 1

This is the most common use of std::mem_fun and std::mem_fun_ref . These are patterns that create functors that call the specified member function. TR1 adds std::tr1::bind , which is also useful and universal (and if you don't have TR1, then it is based on Boost::bind ). C ++ 0x will include std::bind in the standard library (almost unchanged with TR1).

Answer 2

It looks like you want something like boost::bind to bind a member function pointer to an instance of this class.

Could you tell us a little more about what you are trying to do? Code example etc.?

Answer 3

 #include<tr1/functional> 

and use mem_fn ()