c++ - 局部作用域变量是初始化为未确定的值，还是未初始化？

Question

迂腐地说，x是否在下面的代码中初始化了？

int main()
{
    int x;
}

8.5 Initializers [dcl.init](对于 C++11)中有一些关于它的段落，但没有任何示例支持。

Answer 1

它是正式的默认初始化，这意味着对于int，不执行任何初始化。

[dcl.init]/12 (N3797)

If no initializer is specified for an object, the object is default-initialized; if no initialization is performed, an object with automatic or dynamic storage duration has indeterminate value

[dcl.init]/7

To default-initialize an object of type T means:

• if T is a (possibly cv-qualified) class type, the default constructor for T is called [...];

• if T is an array type, each element is default-initialized;

• otherwise, no initialization is performed.