fork download

copy

#include <iostream>
#include <utility>
#include <boost/type_traits.hpp>
 
struct Bar { virtual ~Bar() {} };
struct Foo: Bar {};
struct Faz {};
 
template <typename T>
typename boost::enable_if<boost::is_base_of<Bar, T>>::type
foo(char const* type, T) {
    std::cout << type << " is derived from Bar\n";
}
template <typename T>
typename boost::disable_if<boost::is_base_of<Bar, T>>::type
 
foo(char const* type, T) {
    std::cout << type << " is NOT derived from Bar\n";
}
 
int main()
{
    foo("Foo", Foo());
    foo("Faz", Faz());
}

prog.cpp:10: error: ‘enable_if’ in namespace ‘boost’ does not name a type
prog.cpp:10: error: expected unqualified-id before ‘<’ token
prog.cpp:15: error: ‘disable_if’ in namespace ‘boost’ does not name a type
prog.cpp:15: error: expected unqualified-id before ‘<’ token
prog.cpp: In function ‘int main()’:
prog.cpp:23: error: ‘foo’ was not declared in this scope

Standard output is empty