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c++ vector指针变量进行reserve出现段错误

c++ vector指针变量进行reserve出现段错误是什么原因?

vector<int>* pp;
pp->reserve(5);
如上代码会出现段错误,但是如果把不用指针则不会段错误。
如下代码则不会出现段错误:

vector<int> pp;
pp.reserve(5);


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