?? typenamedid.cpp
字號:
//: C03:TypenamedID.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Using 'typename' to say it's a type,
// and not something other than a type
template<class T> class X {
// Without typename, you should get an error:
typename T::id i;
public:
void f() { i.g(); }
};
class Y {
public:
class id {
public:
void g() {}
};
};
int main() {
Y y;
X<Y> xy;
xy.f();
} ///:~
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