c++ allocator

C++中的`allocator`是一个模板类，用于在动态内存中分配和释放内存。它是STL容器（如vector、list等）的默认空间分配器。通过`allocate`方法可以分配一块指定大小的内存空间，返回指向该空间的指针。而通过`deallocate`方法可以释放先前分配的内存空间。当使用`allocator`时，还可以使用`construct`方法在已分配的内存空间中构造对象，使用`destroy`方法销毁对象，从而更方便地进行内存管理。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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