[問題] vector的push_back?
請問一下vector的push_back一些問題，例如我自定一個class A，然後再
建立一個pool，用vector存，如下所示：
class A
{
public:
A() {}
~A() {}
private:
int m_test;
}
然後main裡：
vector<A> pool_a;
A a1;
pool_a.push_back(a);
然後我做了copy constructor和operator=：
public:
A(const A& rhs) { ....; }
A& operator= (const A& rhs) { ...; }
我想問的是，push_back會到copy constructor裡，但不會到operator=，
如果我把operator=拿到private，complier又會跟我說operator=無法存取
private成員，請問是為什麼呢？
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