c/c++ new 与malloc

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总结下：¨    New .vs. malloc

①    new按照类型自动分配空间，而不需要sizeof

②    new自动返回指定类型指针，而不需要强制类型转换。

③    new和delete可以重载

④    new可以使用变量来动态地建立数组（即上面所列举的格式二）。

new会自动调用构造函数，并完成初始化（即使是=也是调用拷贝构造函数，而不是调用重载的=）。