c++ - C++11 初始化列表可以与动态数组一起使用吗？

Question

初始化指向 nullptr 的动态指针数组的 C++ 是否有效？

int x = 10;
int** p = new int*[ x ]{ };

Answer 1

是的，代码是有效的，值初始化数组的每个元素。

有关标准引用，请参阅§5.3.4/17 [expr.new]

A new-expression that creates an object of type T initializes that object as follows:
— ...
— Otherwise, the new-initializer is interpreted according to the initialization rules of 8.5 for direct-initialization.

然后是§8.5/7 [dcl.init]

To value-initialize an object of type T means:
— ...
— if T is an array type, then each element is value-initialized;
— otherwise, the object is zero-initialized.

在这种情况下，最后一个项目符号适用于每个数组元素。