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What do the following phrases mean in C++: zero-, default- and value-initialization?
我正在阅读 this answer ，所以我遇到了第二个词:value-initialize。最初我认为这与 default-initialize 相同，但上下文提示我错了。
所以我的问题是:
default-initialize和value-initialize有什么区别？
我想通过一些例子来了解其中的区别。
最佳答案
根据标准(8.5/4,5):
To default-initialize an object of type T means:
— if T is a non-POD class type the default constructor for T is called (and the initialization is ill-formed if T has no accessible default constructor);
— if T is an array type, each element is default-initialized;
— otherwise, the object is zero-initialized.
To value-initialize an object of type T means:
— if T is a class type (clause 9) with a user-declared constructor (12.1), then the default constructor for T is called (and the initialization is ill-formed if T has no accessible default constructor);
— if T is a non-union class type without a user-declared constructor, then every non-static data member and base-class component of T is value-initialized;96)
— if T is an array type, then each element is value-initialized;
— otherwise, the object is zero-initialized
关于c++ - 默认初始化和值初始化之间的区别？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5610629/