How to determine which header file a function is associated with?

[neuronet]

Say I am using code with like 20 headers in it, and want to figure out which header file a given function goes with. Is there an easy way to do this in code::blocks? For instance, right click 'std::cout' and is there an option that will let me know that cout goes with <iostream>? This is helpful for me as when I write new functions, I need to know which header files to include but I do not have the standard library, and all its header files, memorized. Yet.

[oBFusCATed]

Select -> right click -> Go to declaration then pray to work

[neuronet]

Select -> right click -> Go to declaration then pray to work

Thanks that usually gives me something intelligible. I wish it would literally just tell me which declaration it is associated with in the file I am checking, rather than open some file with a name loosely associated (sometimes) with the header declaration I have used.