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

in c++-11 it can also be an std::string. So (installing c++-11 and) changing the dialect of you project to c++-11 could also fix the problem.

Answer 2

The ifstream constructor expects a const char*, so you need to do ifstream file(filename.c_str()); to make it work.

Answer 3

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.