No matching function – ifstream open()

by

Change to:

file.open(name.c_str());

or just use the constructor as there is no reason to separate construction and open:

std::ifstream file(name.c_str());

Support for std::string argument was added in c++11.

As loadNumbersFromFile() does not modify its argument pass by std::string const& to document that fact and avoid unnecessary copy.

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