C ++中的VTable何时创建？ [英] When is VTable in C++ created?

问题描述

我想知道何时创建vtable？
是在main（）之前的启动代码中还是在其他时间？

I would like to know when is a vtable created? Whether its in the startup code before main() or is it at some other point of time??

推荐答案

vtable 不是C ++概念，因此是否使用它们以及何时使用它们将取决于实现。

A vtable isn't a C++ concept so if they are used and when they are created if they are used will depend on the implementation.

通常， vtables 是在编译时创建的结构（因为它们可以在编译时确定）。在运行时创建特定类型的对象时，它们将具有一个 vptr ，它将在构造时初始化为指向静态 vtable 。

Typically, vtables are structures created at compile time (because they can be determined at compile time). When objects of a particular type are created at runtime they will have a vptr which will be initialized to point at a static vtable at construction time.

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