typenamedid.cpp

来自「很经典的书籍」· C++ 代码 · 共 24 行

//: C05:TypenamedID.cpp
//{-bor}
// Uses 'typename' as a prefix for nested types

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() {
  X<Y> xy;
  xy.f();
} ///:~