C++范围判断

template< class InputIt, class UnaryPredicate >
bool all_of( InputIt first, InputIt last, UnaryPredicate p );

template< class InputIt, class UnaryPredicate >
bool any_of( InputIt first, InputIt last, UnaryPredicate p );

template< class InputIt, class UnaryPredicate >
bool none_of( InputIt first, InputIt last, UnaryPredicate p );

#include <algorithm>
#include <vector>

int main(int argc, char *argv[])
{
    std::vector<int> v{1, 2, 3, 4, 5};
    if (std::all_of(v.cbegin(), v.cend(), [](int i){ return i % 2 == 0; })) {
        /* 条件成立，所有数都是偶数 */
    }
}