C++函数在STL的<algorithm>库中定义。此函数可在整个数组元素范围内运行，并且可以节省时间运行循环以逐个检查每个元素。它检查每个元素上的给定属性，并在范围内的每个元素满足指定属性时返回true，否则返回false。句法：
template <class InputIterator, class UnaryPredicate> bool all_of (InputIterator first, InputIterator last, UnaryPredicate pred); first:Input iterators to the initial positions in a sequence. last: Input iterators to the final positions in a sequence. pred: An unary predicate function that accepts an element and returns a bool.
异常：如果谓词或迭代器上的操作抛出异常，则抛出异常。
例子：
// C++ code to demonstrate working of all_of()
#include <vector>
#include <algorithm>
#include <iostream>
int main()
{
std::vector<int> v(10, 2);
// illustrate all_of
if (std::all_of(v.cbegin(), v.cend(), [](int i){ return i % 2 == 0; }))
{
std::cout << "All numbers are even\n";
}
}输出：
All numbers are even
// C++ code to demonstrate working of all_of()
#include<iostream>
#include<algorithm> // for all_of()
using namespace std;
int main()
{
// Initializing array
int ar[6] = {1, 2, 3, 4, 5, -6};
// Checking if all elements are positive
all_of(ar, ar+6, [](int x) { return x>0; })?
cout << "All are positive elements" :
cout << "All are not positive elements";
return 0;
}输出：
All are not positive elements
在上面的代码中，-6为负元素会否定条件并返回false。
相关用法
注：本文由纯净天空筛选整理自 std::all_of() in C++。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。