countnotequal.cpp

c++编程思想2TICPP-2nd-ed-Vol-two.zip

//: C06:CountNotEqual.cpp
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Count elements not equal to 20.
#include <algorithm>
#include <cstddef>
#include <functional>
#include <iostream>
using namespace std;

int main() {
  int a[] = { 10, 20, 30 };
  const size_t SIZE = sizeof a / sizeof a[0];
  cout << count_if(a, a + SIZE,
                   not1(bind1st(equal_to<int>(), 20)));// 2
} ///:~