inject-templated-friend.cpp [plain text]
struct std_ostream
{
int dummy;
};
std_ostream cout;
template <typename STRUCT_TYPE>
struct Streamer
{
friend std_ostream& operator << (std_ostream& o, const Streamer& f) {
Streamer s(f);
s(o);
return o;
}
Streamer(const STRUCT_TYPE& s) : s(s) {}
const STRUCT_TYPE& s;
void operator () (std_ostream&) const;
};
typedef struct Foo {} Foo;
std_ostream& operator << (std_ostream&, const Streamer<Foo>&);
#ifdef REDEFINE
std_ostream& operator << (std_ostream& o, const Streamer<Foo>&) {
return o;
}
#endif
template <>
void Streamer<Foo>::operator () (std_ostream& o) const {
}
int main(void)
{
Foo foo;
cout << foo;
}