具有多个谓词的C ++ 11算法 [英] C++11 algorithms with multiple predicates

问题描述

算法标题中的 std :: find_if 等函数非常有用，是每个调用 count_if 只能使用1个谓词的事实。

Functions such as std::find_if from the algorithm header are really useful, but 1 serious limit for me is the fact that I can only use 1 predicate for each call to count_if.

例如给定一个容器 std :: vector 我想同时应用 find_if 的同一个迭代谓词在标准库中有一些可以保持这种功能的方法？

For example given a container like an std::vector I would like to apply, at the same time, with the same iteration of find_if, multiple predicates; there is something in the standard library that makes this possible while keeping this functional approach ?

推荐答案

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Just combine them with a lambda:

std::find_if(begin(vec), end(vec),
    [](elem_t val) {
        return f1(val) || f2(val);
    });

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