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#include <iostream>
#include <string>
 
class Base
{
public:
	virtual std::string Foo()
	{
		return "Base";
	}
};
 
template <typename T>
class Derived : public Base
{
public:
	typename std::enable_if<std::is_same<T, float>::value, std::string>::type 
	virtual Foo() override
	{
		return "Derived";
	}
};
 
int main()
{
	Derived<int> testInt;
	std::cout << testInt.Foo() << std::endl;
 
	Derived<float> testFloat;
	std::cout << testFloat.Foo() << std::endl;
}

prog.cpp: In instantiation of ‘class Derived<int>’:
prog.cpp:26:15:   required from here
prog.cpp:18:10: error: no type named ‘type’ in ‘struct std::enable_if<false, std::basic_string<char> >’
  virtual Foo() override
          ^

Standard output is empty