是可变长度数组在c ++？ [英] Are variable length arrays there in c++?

问题描述

我一直认为c ++中不允许使用可变长度数组（请参阅：可变长度数组在C ++？）。但为什么这个代码编译和工作？

I had always thought that variable length arrays were not allowed in c++(Refer :Variable length arrays in C++?) .But than why does this code compile and work?

#include <iostream>
using namespace std;

int main () {

    int n;
    cin >> n;

    int a[n];

    for (int i=0; i<n; i++) {
        a[i] = i;
    }

    for (int i=0; i<n; i++) {
        cout << a[i] << endl;
    }
}

推荐答案

当前C ++标准不需要编译器VLA。但是，编译器供应商允许支持VLA作为扩展。

The current C++ standard does not require that compilers VLAs. However, compiler vendors are permitted to support VLAs as an extension.

最初建议VLA出现在C ++ 14中，但是建议没有成功。他们可能会返回C ++ 17。

It was originally proposed that VLAs would appear in C++14, however the proposal did not succeed. They may return for C++17.

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