std::for_each 优于 for 循环的优点

2021-12-26 00:00:00 coding-style foreach c++ stl

std::for_each有什么优势吗?a> 超过 for 循环?对我来说，std::for_each 似乎只会阻碍代码的可读性.为什么有些编码标准推荐使用它?

Are there any advantages of std::for_each over for loop? To me, std::for_each only seems to hinder the readability of code. Why do then some coding standards recommend its use?

推荐答案

C++11(以前称为 C++0x)，就是这个令人厌烦的争论将得到解决.

The nice thing with C++11 (previously called C++0x), is that this tiresome debate will be settled.

我的意思是，想遍历整个集合的心智正常的人不会仍然使用它

I mean, no one in their right mind, who wants to iterate over a whole collection, will still use this

for(auto it = collection.begin(); it != collection.end() ; ++it)
{
   foo(*it);
}

或者这个

for_each(collection.begin(), collection.end(), [](Element& e)
{
   foo(e);
});

当基于范围的for循环语法可用时:

when the range-based for loop syntax is available:

for(Element& e : collection)
{
   foo(e);
}

这种语法在 Java 和 C# 中已经有一段时间了，实际上，在每个最近的 Java 中，foreach 循环比经典的 for 循环更多我看到的 C# 代码.

This kind of syntax has been available in Java and C# for some time now, and actually there are way more foreach loops than classical for loops in every recent Java or C# code I saw.

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