根据allocator的标准接口，编写的功能、接口不齐全的allocator

#ifndef MYALLOC_H#define MYALLOC_H#include<new>//for placement new#include<cstddef>//for ptrdiff_t size_t#include<cstdlib>//for exit#include<climits>//for unit_Max#include<iostream>namespace JJ{template<class T>inline T* _allocate(ptrdiff_t size,T *){set_new_handler(0);T* tmp = (T*)operator new((size_t)(size*sizeof(T)));if(NULL == tmp){cout<<"out of memory"<<endl;exit(1);}return tmp;}template<class T>inline void _deallocate(T* buf){::operator delete(buf);}template<class T1,class T2>inline void _construct(T1 *p,const T2& value){new(p)T1(value);}template<class T>inline void _destroy(T* ptr){ptr->~T();}template<class T>class allocator{public:typedef T         value_type;typedef T*        pointer;typedef const T*  const_pointer;typedef T&        reference;typedef const T&  const_reference;typedef size_t    size_type;typedef ptrdiff_t difference_type;template<class U>struct rebind{typedef allocator<U> other;};    pointer allocate(size_type n,const void* hint=0){return _allocate(difference_type(n),(pointer)0);}void deallocate(pointer ptr,size_type n){_deallocate(ptr);}void construct(pointer ptr,const T& t){_construct(ptr,t);};void distroy(pointer ptr){_destroy(ptr);}pointer address(reference x){return (pointer)&x;}const_pointer const_address(reference x)const{return (const_pointer)&x;}size_type max_size() const{return size_type(UINT_MAX/sizeof(T));}};};#endif