C++ ifstream error using string as opening file path.

Question

I have:

string filename: 
ifstream file(filename);

The compilers complains about no match between ifstream file and a string. Do I need to

Answer 1

Change

ifstream file(filename);

to

ifstream file(filename.c_str());

Because the constructor for an ifstream takes a const char*, not a string pre-C++11.