class with pointer member
1.三个特殊的函数
拷贝构造,拷贝赋值,析构
2.ctor 和 dtor
inline String::String(const char* cstr = 0)
{
if(cstr)
{
m_data = new char[strlen(cstr)+1];
strcpy(m_data, cstr);
}
else
{
m_data = new char[1];
*m_data = '\0';
}
}
inline String::~String()
{
delete[] m_data;
}
{
String s1();
String s2("hello");
String* p = new String("hello");
delete p;
}
3.带有指针的类必须有拷贝构造和拷贝赋值(自订)
深拷贝和浅拷贝
inline String& String::operator=(const String& str)
{
if(this == &str)
return *this;
delete[] m_data;
m_data = new char[strlen(str.m_data) + 1];
strcpy(m_data, str.m_data);
return *this;
}