[b]1. 概述 [/b]STL Allocator是STL的内存管理器，也是最低调的部分之一，你可能使用了3年stl，但却不知其为何物。 [b]STL标准如下介绍Allocator [/b]the STL includes some low-level mechanisms for allocating and deallocating memory. Allocators are very specialized, and you can safely ignore them for almost all purposes. Allocators encapsulate allocation and deallocation of memory. They provide a low-level interface that permits efficient allocation of many small objects; different allocator types represent different schemes for memory management. <STL 源码剖析>将其描述为空间配置器，理由是allocator可以将其它存储介质（例如硬盘）做为stl 容器的存储空间。由于内存是allocator管理的主要部分，因此，本文以STL内存管理为出发点介绍allocator。 Allocator就在我们身边，通常使用STL的方式： #include <vector> std::vector<int> Array(100); 本质上，调用的是： #include <vector> std::vector<int,[b]std::allocator[/b]> Array(100); std::allocator就是一个简单的Allocator [b]2. 使用 [/b]针对不同的应用场合，STL中实现了不同的Allocator，如下（gcc-3.4：[url=http://www.cs.huji.ac.il/~etsman/Docs/gcc-3.4-base/libstdc++/html/20_util/allocator.html]http://www.cs.huji.ac.il/~etsman/Docs/gcc-3.4-base/libstdc++/html/20_util/allocator.html[/url]）: __gnu_cxx::new_allocator<T> Simply wraps ::operator new and ::operator delete. __gnu_cxx::malloc_allocator<T> Simply wraps malloc and free. There is also a hook for an out-of-memory handler __gnu_cxx::debug_allocator<T> A wrapper around an arbitrary allocator A. It passes on slightly increased size requests to A, and uses the extra memory to store size information. __gnu_cxx::__pool_alloc<bool, int> A high-performance, single pool allocator. The reusable memory is shared among identical instantiations of this type. __gnu_cxx::__mt_alloc<T> A high-performance fixed-size allocatorthat was initially developed specifically to suit the needs of multi threaded applications __gnu_cxx::bitmap_allocato A high-performance allocator that uses a bit-map to keep track of the used and unused memory locations 例如，在多线程环境下，可以使用： [b]3.一个简单的Allocator实现 [/b]我们可以实现自己的allocator