每个in，for或for_each中哪个更合适? [英] Which is preferable for each, in or for_each?

问题描述

使用Visual Studio时，至少可以通过以下三种方式编写容器遍历.哪种方法更可取?假设:

When using Visual Studio, I can write a container traversal in at least the following three ways. Which way is preferable? Assuming:

vector<CString> strings1;

方法1(使用带有lambda的 for_each 算法:

Method 1 (using the for_each algorithm with a lambda:

for_each(strings1.begin(), strings1.end(), [](CString s){
   _tprintf(_T("%s"), s);
}

方法2(对于Microsoft，特定于/，分别使用):

Method 2 (using for each, in, microsoft specific):

for each(auto s in strings1)
{
   _tprintf(_T("%s"), s);
}

方法3(使用数组语法处理向量):

Method 3 (treat the vector with array syntax):

for (int i=0; i<v.size(); ++i)
{
   _tprintf(_T("%s"), v[i]);
}

我知道方法2不是可移植的，但是我并不在乎是可移植的.这仅需要在Windows中工作.

I am aware that method 2 is not portable, but I don't care about being portable. This only needs to work in Windows.

推荐答案

就像斯蒂芬·拉瓦维(几天前)在"GoingNative 2012"会议上指出的那样，基于范围"的for循环将是其中的一部分新的Visual Studio即将发布的beta版本.所以这就是要走的路:

As Stephan T. Lavavej pointed out just a couple of days ago at the "GoingNative 2012" conference, the "official" range-based for loop will be part of the soon-to-be-released beta version of the new Visual Studio. So this will be the way to go:

for(auto s : strings1)
{
   _tprintf(_T("%s"), s);
}

或使用引用来减少按值使用的复制工作:

or use a reference to reduce copying effort for the by-value use:

for (auto &s : strings1)  ....

可以在此处

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