void* memcpy1(void *dst,const void *src,int count){

	assert(dst != NULL && src!= NULL && count>=0);
	void *temp = dst;
	char *pdst = (char*)dst;
	char *psrc = http://www.mamicode.com/(char*)src;>
2 string 类的部分实现

class MyString{
public:
	friend ostream& operator<<(ostream&,const MyString&);
	MyString(const char *str = NULL){
		if(NULL == str)
			m_data = http://www.mamicode.com/0;>