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#include <iostream>
#include <string>
 
// Class definition
template <typename T> class foo
{
public:
	// Constructor
	foo(T value) { this->value = value; }
	// Public function
	T twice() { return this->value + this->value; }
 
private:
	// Private function
	void bar() { }
	// Private member
	T value;
};
 
int main()
{
	foo f1(1);
	foo f2(std::string("1"));
 
	std::cout << f1.twice() << '\n';
	std::cout << f2.twice() << '\n';
	std::cout << foo<float>(3.14).twice() << '\n';
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:22:6: error: missing template arguments before ‘f1’
  foo f1(1);
      ^
prog.cpp:22:6: error: expected ‘;’ before ‘f1’
prog.cpp:23:6: error: missing template arguments before ‘f2’
  foo f2(std::string("1"));
      ^
prog.cpp:23:6: error: expected ‘;’ before ‘f2’
prog.cpp:25:15: error: ‘f1’ was not declared in this scope
  std::cout << f1.twice() << '\n';
               ^
prog.cpp:26:15: error: ‘f2’ was not declared in this scope
  std::cout << f2.twice() << '\n';
               ^

Standard output is empty