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#include <iostream>
#include <functional>
 
template <template <typename R,
    	    typename A> R func(A)>
struct S : std::unary_function<R, A>
{
    R operator()(A arg) const
    {
	return func(arg);
    }
};
 
int foo(int x)
{
    return x;
}
 
int main()
{
    S<foo> s;
 
    std::cout << s(42) << std::endl;
}

prog.cpp:5: error: expected `class' before ‘R’
prog.cpp:5: error: expected ‘>’ before ‘func’
prog.cpp:6: error: ‘A’ was not declared in this scope
prog.cpp:6: error: type/value mismatch at argument 1 in template parameter list for ‘template<class _Arg, class _Result> struct std::unary_function’
prog.cpp:6: error:   expected a type, got ‘R’
prog.cpp:6: error: template argument 2 is invalid
prog.cpp:8: error: ISO C++ forbids declaration of ‘R’ with no type
prog.cpp:8: error: expected ‘;’ before ‘operator’
prog.cpp:12: error: expected `;' before ‘}’ token
prog.cpp: In function ‘int main()’:
prog.cpp:21: error: type/value mismatch at argument 1 in template parameter list for ‘template<template<class R, class A> class R> struct S’
prog.cpp:21: error:   expected a class template, got ‘foo’
prog.cpp:21: error: invalid type in declaration before ‘;’ token
prog.cpp:23: error: ‘s’ cannot be used as a function

Standard output is empty