static_cast void* - > string

weixin_30470857

于 2018-11-22 19:13:00 发布

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原文链接：http://www.cnblogs.com/wllwqdeai/p/10003321.html

本文演示了如何使用C++中的static_cast进行类型转换，将动态分配的字符串转换为void指针，并在后续中如何将其转回字符串指针。通过实例展示了内存管理的重要性，包括如何正确地分配和释放内存。

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// Cast a dynamically allocated string to 'void*'.
void *vp = static_cast<void*>(new std::string("it's easy to break stuff like this!"));

// Then, in the function that's using the UserEvent:
// Cast it back to a string pointer.
std::string *sp = static_cast<std::string*>(vp);//vp=void*
// You could use 'sp' directly, or this, which does a copy.
std::string s = *sp;
// Don't forget to destroy the memory that you've allocated.
delete sp;