C ++支持可变长度数组？ [英] Does C++ support Variable Length Arrays?

问题描述

不，等待，忍受我...

No, wait, bear with me...

VLA始终是GCC扩展，但它们被C99采用：

VLAs were always a GCC extension, but they were adopted by C99:

[C99：6.7.5.2/4]：如果大小不存在，数组类型是
不完整类型。如果大小是*而不是一个表达式，
数组类型是一个未指定大小的变量长度数组类型，其中
只能用于函数原型作用域的声明;这样的
数组仍然是完整的类型。 如果大小是整数
常量表达式，且元素类型具有已知的常量大小，
数组类型不是可变长度数组类型; 否则，
数组类型是一个变长数组类型。

[C99: 6.7.5.2/4]: If the size is not present, the array type is an incomplete type. If the size is * instead of being an expression, the array type is a variable length array type of unspecified size, which can only be used in declarations with function prototype scope; such arrays are nonetheless complete types. If the size is an integer constant expression and the element type has a known constant size, the array type is not a variable length array type; otherwise, the array type is a variable length array type.

ISO / IEC 9899：1999 。

现在：

[C ++ 11：1.1 / 2]： C ++是一种基于通用编程语言的
在ISO / IEC 9899：1999
（以下简称C标准）中规定的C编程语言。除了C提供的
设施外，C ++还提供了额外的数据类型，类，
模板，异常，命名空间，操作符重载，函数名
重载，引用，管理运营商和
额外的图书馆设施。

[C++11: 1.1/2]: C++ is a general purpose programming language based on the C programming language as specified in ISO/IEC 9899:1999 (hereinafter referred to as the C standard). In addition to the facilities provided by C, C++ provides additional data types, classes, templates, exceptions, namespaces, operator overloading, function name overloading, references, free store management operators, and additional library facilities.

推荐答案

这个余地的措辞并不意味着C99中的任何东西都是C ++ 11。您所引用的只是介绍性文字。

That leeway wording doesn't mean that any and everything in C99 is in C++11. What you quoted is just introductory text.

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