C++_STL_all_of

all_of

---

功能描述

如果在[first,last)范围内的数组进行判断，
如果pred返回true返回true
否则返回false
等同于

template<class InputIterator, class UnaryPredicate>
  bool all_of (InputIterator first, InputIterator last, UnaryPredicate pred)
{
  while (first!=last) {
    if (!pred(*first)) return false;
    ++first;
  }
  return true;
}

---

参数

• first last 数组的范围[first,last)
• pred 单个参数的函数，接受前面数组给的每个元素，判断并给出返回值

---

范例

#include <iostream>
#include <algorithm>
#include <array>

int main(){
    std::array<int,8> foo = {3,5,7,12,13,17,19,23};
    if(std :: all_of(foo.begin(),foo.begin() + 3,[](int i){return i%2;}))
        std::cout << "All the elements are odd numbers.
";
    else 
        std::cout << "Not all the elements are odd numbers.
";
    return 0;
}

输出:

Not all the elements are odd numbers.