operator new()

operator new()是一个用于动态分配内存的函数。它被用来在堆上分配一片指定大小的内存空间，并返回一个指向该内存空间的指针。 通常情况下，当我们使用new运算符来创建一个对象时，实际上会调用operator new()来分配内存，并调用相应的构造函数来创建对象。 operator new()可以被重载，但new操作符本身是不能被重载的。 当类A重载了operator new()函数时，就会使用A::operator new()来分配内存；否则，会使用全局::operator new()来分配内存。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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