lookup2.cpp

c++编程思想2TICPP-2nd-ed-Vol-two.zip

//: C05:Lookup2.cpp {-bor}{-g++}{-dmc}
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Microsoft: use option -Za (ANSI mode)
#include <algorithm>
#include <iostream>
#include <typeinfo>
using std::cout;
using std::endl;

void g() { cout << "global g()" << endl; }

template<class T> class Y {
public:
  void g() {
    cout << "Y<" << typeid(T).name() << ">::g()" << endl;
  }
  void h() {
    cout << "Y<" << typeid(T).name() << ">::h()" << endl;
  }
  typedef int E;
};

typedef double E;

template<class T> void swap(T& t1, T& t2) {
  cout << "global swap" << endl;
  T temp = t1;
  t1 = t2;
  t2 = temp;
}

template<class T> class X : public Y<T> {
public:
  E f() {
    g();
    this->h();
    T t1 = T(), t2 = T(1);
    cout << t1 << endl;
    swap(t1, t2);
    std::swap(t1, t2);
    cout << typeid(E).name() << endl;
    return E(t2);
  }
};

int main() {
  X<int> x;
  cout << x.f() << endl;
} ///:~