reference.cpp

ThinkingC++中文版

//: C11:Reference.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Simple C++ references

int* f(int* x) 
{
	int a=1;
	x=&a;

  (*x)++;
  return x; // Safe, x is outside this scope
}

string str;

int& g(int& x) {
  x++; // Same effect as in f()
  return x; // Safe, outside this scope
}

int& h() {
  //int q;
  //return q;  // Error
  static int x;
  return x; // Safe, x lives outside this scope
}

int main() {
  int a = 0;
  f(&a); // Ugly (but explicit)
  g(a);  // Clean (but hidden)
  g(a) = 6;	 //be equivalent to a++; a=6;
} ///:~