C++ 程序员应该避免 memset 吗?

2022-01-18 00:00:00 initialization c++ memset

听说c++程序员应该避免memset，

I heard a saying that c++ programmers should avoid memset,

class ArrInit {
    //! int a[1024] = { 0 };
    int a[1024];
public:
    ArrInit() {  memset(a, 0, 1024 * sizeof(int)); }
};

所以考虑到上面的代码，如果你不使用 memset，你怎么能让一个 [1..1024] 填充零?C++ 中的 memset 有什么问题?

so considering the code above,if you do not use memset,how could you make a[1..1024] filled with zero?Whats wrong with memset in C++?

谢谢.

推荐答案

问题不在于在内置类型上使用 memset()，而是在类(也称为非 POD)类型上使用它们.这样做几乎总是会做错事，而且经常会做致命的事――例如，它可能会踩到虚函数表指针.

The issue is not so much using memset() on the built-in types, it is using them on class (aka non-POD) types. Doing so will almost always do the wrong thing and frequently do the fatal thing - it may, for example, trample over a virtual function table pointer.

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