memfun4.cpp

来自「C++编程思想第二版第一册答案」· C++ 代码 · 共 31 行

//: C21:MemFun4.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Using the SGI STL compose1 function
#include "NumStringGen.h"
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
#include <functional>
using namespace std;

int main() {
  const int sz = 9;
  vector<string> vs(sz);
  // Fill it with random number strings:
  generate(vs.begin(), vs.end(), NumStringGen());
  copy(vs.begin(), vs.end(), 
    ostream_iterator<string>(cout, "\t"));
  cout << endl;
  vector<double> vd;
  transform(vs.begin(), vs.end(), back_inserter(vd),
    compose1(ptr_fun(atof), 
      mem_fun_ref(&string::c_str)));
  copy(vd.begin(), vd.end(), 
    ostream_iterator<double>(cout, "\t"));
  cout << endl;
} ///:~