可以（C / C ++）数组初始化引用本身吗？ [英] Can a (C/C++) array initialization reference itself?

问题描述

我想知道下列形式的初始化：

I was wondering about an initialization of the following form:

int  array[] = {
v - 1,
array[0] + 1
} ;

在初始化第二个元素时，使用第一个元素的值，但整个数组是尚未初始化。这发生在使用g ++编译，但是我不确定这是否实际上是可移植的和一个很好定义的结构。

In the initialization of the second element, the value of the first is used, but the entire array is not yet initialized. This happens to compile with g++, but I was unsure whether this is actually portable and a well defined construct?

推荐答案

2声明点：

名称的声明点紧接在其完整声明符（第8条）之后，在
初始化程序（如果有），除非另有说明。 [示例：

The point of declaration for a name is immediately after its complete declarator (Clause 8) and before its initializer (if any), except as noted below. [ Example:

int x = 12;
{ int x = x; }

这里，第二个x被初始化为它自己的。 -end example]

Here the second x is initialized with its own (indeterminate) value. —end example ]

所以你是指正确的数组，它的名字在 = 。

So you are referring to the array correctly, its name is known after the =.

然后，8.5.1汇总：

Then, 8.5.1 Aggregates:

一个聚合是数组或类[...]

An aggregate is an array or a class [...]

17：初始化子句中的完整表达式按照它们出现的顺序进行计算。

17: The full-expressions in an initializer-clause are evaluated in the order in which they appear.

但是，我没有看到评估值实际写入数组的引用，因此我不会依赖于此，甚至会声明你的代码没有被很好地定义。

However, I see no reference to when the evaluated values are actually written into the array, so I wouldn't rely on this and would even go so far to declare your code as not well defined.

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