是否允许递归初始化数组？
Is it allowed to initialize array recursively?
我有以下代码片段：
int i[] = {42, i[0]};
是否允许这样的初始化或导致未定义的行为？
三大编译器（gcc、clang、msvc）给我 42 for i[1]。因此看起来是合法的，但我想看到这个案例的标准引用。
是的，定义明确。
int i[] = {42, i[0]};
这是一个聚合1初始化2。聚合初始化遵守这条规则：
[dcl.init.aggr]/6
The initializations of the elements of the aggregate are evaluated in the element order. That is, all value computations and side effects associated with a given element are sequenced before those of any element that follows it in order.
我有以下代码片段：
int i[] = {42, i[0]};
是否允许这样的初始化或导致未定义的行为？
三大编译器（gcc、clang、msvc）给我 42 for i[1]。因此看起来是合法的，但我想看到这个案例的标准引用。
是的，定义明确。
int i[] = {42, i[0]};
这是一个聚合1初始化2。聚合初始化遵守这条规则：
[dcl.init.aggr]/6The initializations of the elements of the aggregate are evaluated in the element order. That is, all value computations and side effects associated with a given element are sequenced before those of any element that follows it in order.