dynamicdebugflags.cpp

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

//: C03:DynamicDebugFlags.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
#include <iostream>
#include <string>
using namespace std;
// Debug flags aren't necessarily global:
bool debug = false;

int main(int argc, char* argv[]) {
  for(int i = 0; i < argc; i++)
    if(string(argv[i]) == "--debug=on")
      debug = true;
  bool go = true;
  while(go) {
    if(debug) {
      // Debugging code here
      cout << "Debugger is now on!" << endl;
    } else {
      cout << "Debugger is now off." << endl;
    }  
    cout << "Turn debugger [on/off/quit]: ";
    string reply;
    cin >> reply;
    if(reply == "on") debug = true; // Turn it on
    if(reply == "off") debug = false; // Off
    if(reply == "quit") break; // Out of 'while'
  }
} ///:~