C ++ sizeof包装类 [英] C++ sizeof wrapper class

问题描述

假设我有一个类A，不继承任何东西，没有虚拟方法，只有一个类型T的变量。C ++保证 sizeof（A）== sizeof（T）？

编辑：

此外，如果T是复合类型，差异？

不，可能超过 sizeof（T）由于填充。

Suppose I have a class A that does not inherit from anything, has no virtual methods, and has exactly one variable of type T. Does C++ guarantee sizeof(A) == sizeof(T)?

EDIT:

Also if T were a composite type, would it make a difference?

解决方案

No, it might be more than sizeof(T) due to padding.

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