让我们一起来实现一个完整的内存管理工具（线程，内存池，萃取）

;class String{ public:String():ptr(new char[1]){cout<<“String()”<<endl;ptr[0]=’\0′;}~String(){if(ptr){delete ptr;ptr = NULL;}}String([strlen(p)+1]){strcpy(ptr,p);}void Printf(){cout<<“liuhuiyan”<<endl;cout<<ptr<<endl;}String(const String& s):ptr(new char[strlen(s.ptr)+1]){strcpy(ptr,s.ptr);}String& operator = (const String &s){if(this!=&s){if(ptr)delete []ptr;ptr = (char *)malloc(strlen(s.ptr)+1);strcpy(ptr,s.ptr);}}char& operator [](int size){return ptr[size];} private:char *ptr;};///测试类struct Node{void *_P;size_t _Line;char *_Filename;size_t _Size;Node(void *q = NULL,size_t len = size_t(),\const char *name=””,int d=int()):_P(q),\_Line(len),_Filename(new char[strlen(name)+1]),_Size(d){strcpy(_Filename,name);}};<Node> mlist;//调用stl的一个链表保存.ostream& operator <<(ostream& os,const Node &node)//重载内存泄漏输出信息。{cout<<node._P<<endl;cout<<node._Line<<endl;cout<<node._Filename<<endl;cout<<node._Size<<endl; }///////////////////////////////////////////////struct _false{};triast{public:typedef _false _ISPOD_ ; };template<>class triast<int>//特化{public:typedef _true _ISPOD_;};template<>//特化。class triast<char>{public:typedef _true _ISPOD_;};<typename type>class Traist{public:typedef type _type_;};template<typename type>static void traits(type &val){typedef typename Traist<type> :: _type_ _TYPE_;*val=”123″;val->Printf();}<typename type>*_file_,int _line_,_true,type s1){//不需要调用构造函数的赖皮空间的方式如int *,char * void *p = malloc(size);Node node(p,size,_file_,_line_);mlist.push_back(node);return p;}template<typename type>*_file_,int _line_,_false,type s1){//需要调用构造函数的靠皮空间的方式如：String s();void *p = malloc(size);Node node(p,size,_file_,_line_);mlist.push_back(node);new(p)type();return p;}template<typename type>*_file_,int _line_,type s1){typedef typename triast<type> :: _ISPOD_ ispod;_ALLOC(size,_file_,_line_,ispod(),s1);}static void Printf(){list<Node> :: iterator it;it = mlist.begin();while(it!=mlist.end()){cout<<*it<<“\t”;++it;}}static void DELETE(void *p)//这里就需要类型萃取，，自动判别P的类型，看是否需要调用构造函数。{list<Node>::iterator it;it = mlist.begin();while(1){if(it->_P==p){mlist.erase(it);break;}it++;}}int main(){String *s = (String *)ALLOC(sizeof(String),String);traits(s);;}

不是每个人都一定快乐，不是每种痛都一定要述说。