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#include <iostream>
 
template <class B>
class A
{
public:
   void Foo(B& b)
   {
   	   static_cast<void (B::*)(float)>(&B::Bar);
 
       b.Bar(0.5);
   }
};
 
class B
{
public:
    //void Bar(float) {}
    void Bar(double) {}
    void Bar(int) {}
};
 
int main() {
	A<B> a;
	B b;
	a.Foo(b);
 
	return 0;
}

prog.cpp: In instantiation of ‘void A<B>::Foo(B&) [with B = B]’:
prog.cpp:26:9:   required from here
prog.cpp:9:8: error: no matches converting function ‘Bar’ to type ‘void (class B::*)(float)’
        static_cast<void (B::*)(float)>(&B::Bar);
        ^
prog.cpp:20:10: note: candidates are: void B::Bar(int)
     void Bar(int) {}
          ^
prog.cpp:19:10: note:                 void B::Bar(double)
     void Bar(double) {}
          ^

Standard output is empty