consttemporary.cpp

Thinking in c++ 2nd edition,c++编程思想（第2版）

//: C08:ConstTemporary.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Temporaries are const

class X {};

X f() { return X(); } // Return by value

void g1(X&) {} // Pass by non-const reference
void g2(const X&) {} // Pass by const reference

int main() {
  // Error: const temporary created by f():
//!  g1(f());
  // OK: g2 takes a const reference:
  g2(f());
} ///:~