Please help me with this error. Thank you in advance
[Linker error] undefined reference to `Simple_window::Simple_window(Point, int, int, String const&)'

that error means you failed to implement that function in your *.cpp or *.h file. Also recheck spelling and capitalization to make sure they are consistent.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.