Install FLTK on VS 2013

[Kubani]

Hello all,

Is there a correct way of installing FLTK (say. 1.3.2) on vs 2013 and get it ran below code successfully?

#include <Simple_window.h>

int main()
{
	Simple_window win(Point(100, 100), 1000, 600, "test");
	Circle c(Point(200, 200), 50);
	win.attach(c);
	win.wait_for_button();
}

I got this error: Error 16 error C2440: 'return' : cannot convert from 'std::ifstream' to 'bool' c:\program files\microsoft visual studio 12.0\vc\include\graph.cpp 371 1 Win32Project1

[MiiNiPaa]

It looks that there is an error in graph.cpp which prevents this code to work on compilers which strictly adheres to standard.

Any chance you can post relevant line from graph.cpp?

[Kubani]

The problem has to do with this

bool can_open(const string& s)
            // check if a file named s exists and can be opened for reading
{
	ifstream ff(s.c_str());
	return ff;
}

part of the graph.cpp (http://www.stroustrup.com/Programming/PPP2code/Graph.cpp ). It's in lower parts of the file.

But when I install FLTK on vs 2012 I have no problem with the code (circle ....)!

[MiiNiPaa]

Basically you need to change line 5 to return static_cast<bool>(ff);

It looks like an error in original code. I am still not sure if it is that way, but it looks like returning a value implicitely convert it to return type (as opposed to explicitely)
As operator bool is explicit it cannot be used in implicit conversions.

[Kubani]

This way I get linking errors (5 ones), one of them:

Error 10 error LNK2001: unresolved external symbol "public: virtual void __thiscall Fl_Image::color_average(enum Fl_Color,float)" (?color_average@Fl_Image@@UAEXW4Fl_Color@@M@Z) C:\Users\CS\documents\visual studio 2013\Projects\Win32Project1\Win32Project1\fltkimagesd.lib(Fl_GIF_Image.obj) Win32Project1

I had that FLTK with vs 2012 but hadn't such a problem. My vs 2013 is update 3.