constvol.cpp

来自「Thinking in C++ 2nd edition source code 」· C++ 代码 · 共 19 行

//: C03:Constvol.cpp
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Const AND volatile together
class Comm {
  unsigned char databyte;
public:
  Comm() { databyte = 0; }
  unsigned char read() const volatile {
    return databyte;
  }
};
int main() {
  const volatile Comm port;
  port.read();
} ///:~