为什么我需要包含< vector>使用它们? [英] why do i need to include <vector> to use them?

问题描述

我是C ++的新手，试图弄清楚如何使用 vector .

I am new to C++ and trying to figure out how to use vector.

更具体地说，我想知道何时需要使用#include< vector> .我之所以这么问，是因为我看到过带有和不带有 #include 语句的程序，它们在程序中使用 vector .

More specifically, I want to know when I need to use #include<vector>. I am asking that because I have seen programs with and without the #include statement that use vector in the program.

推荐答案

当您看到使用 std :: vector 而不使用 #include< vector> 的代码>，该代码已损坏.期间.

When you see code that uses std::vector, but did not #include <vector>, that code is broken. Period.

在特定的编译器/标准库实现/平台/行星上工作可能恰好发生"，这取决于哪些其他恰好发生"的标准头文件已经包含了< vector> 供自己使用.不得依赖.

It may "just so happen" to work on particular compilers/standard library implementations/platforms/planets, depending on which other standard headers "just so happen" to already be including <vector> for their own use. This shall not be relied upon.

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