progvals.cpp

C++编程思想第二版第一册答案

//: C20:ProgVals.cpp {O}
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
#include "ProgVals.h"
using namespace std;

ProgVals::ProgVals(
  std::string defaults[][2], int sz) {
  for(int i = 0; i < sz; i++)
    insert(make_pair(
      defaults[i][0], defaults[i][1]));
}

void ProgVals::parse(int argc, char* argv[],
  string usage, int offset) {
  // Parse and apply additional
  // command-line arguments:
  for(int i = offset; i < argc; i++) {
    string flag(argv[i]);
    int equal = flag.find('=');
    if(equal == string::npos) {
      cerr << "Command line error: " <<
        argv[i] << endl << usage << endl;
      continue; // Next argument
    }
    string name = flag.substr(0, equal);
    string value = flag.substr(equal + 1);
    if(find(name) == end()) {
      cerr << name << endl << usage << endl;
      continue; // Next argument
    }
    operator[](name) = value;
  }
}

void ProgVals::print(ostream& out) {
  out << "Program values:" << endl;
  for(iterator it = begin(); it != end(); it++)
    out << (*it).first << " = "
        << (*it).second << endl;
} ///:~