Create MyString.cpp

类和对象/强化-重载-字符串封装/MyString.cpp

@@ -0,0 +1,123 @@
+#include "Mystring.h"
+//有参构造
+
+MyString::MyString()
+{
+	this->m_MyString = new char[10];
+	//memset(m_MyString, 0, 10);
+	cout << "无参构造函数调用" << endl;
+}
+
+MyString::MyString(char *S)
+{
+	cout << "有参构造函数调用" << endl;
+	this->m_MyString = new char[strlen(S) + 1];
+	strcpy(m_MyString, S);
+	this->m_Size = strlen(S) ;
+}
+
+
+
+MyString::MyString(const MyString & p)
+{
+	cout << "拷贝函数调用" << endl;
+	this->m_MyString = new char[strlen(p.m_MyString) + 1];
+	strcpy(this->m_MyString, p.m_MyString);
+}
+
+MyString & MyString::operator=(const MyString & p)
+{
+	//判断
+	if(this->m_MyString!=NULL)
+	{
+		delete[] this->m_MyString;
+		this->m_MyString = NULL;
+	}
+	this->m_MyString = new char[strlen(p.m_MyString) + 1];
+	strcpy(this->m_MyString , p.m_MyString);
+	return *this;
+}
+
+MyString MyString::operator=(const char * S)
+{
+	if (this->m_MyString != NULL)
+	{
+		delete[] this->m_MyString;
+		this->m_MyString = NULL;
+	}
+	this->m_MyString = new char[strlen(S) + 1];
+	strcpy(this->m_MyString, S);
+	return *this;
+}
+
+   char& MyString::operator[](int index)
+{
+	return  m_MyString[index];
+}
+
+
+
+MyString MyString::operator+(char * S)
+{
+	char * temp;
+	int NewSize = this->m_Size + strlen(S) + 1;
+	temp = new char[NewSize];
+	memset(temp, 0, NewSize);
+	strcat(temp, this->m_MyString);
+	strcat(temp, S);
+
+	MyString p1 = temp;//相当于有参构造
+
+	return  p1;
+}
+
+MyString MyString::operator+(MyString & p)
+{
+	char * temp;
+	int NewSize = this->m_Size + p.m_Size+1 ;
+	temp = new char[NewSize];
+	memset(temp, 0, NewSize);
+	strcat(temp, this->m_MyString);
+	strcat(temp, p.m_MyString);
+	MyString p1 = temp;//相当于有参构造
+
+	return  p1;
+}
+
+char * MyString::GetString()
+{
+
+	return this->m_MyString;
+}
+
+MyString::~MyString()
+{
+	cout << "析构函数调用" << endl;
+	if(this->m_MyString!=NULL)
+	{
+		delete [] this->m_MyString;
+		this->m_MyString = NULL;
+	}
+}
+// 左移位运算符重载<<
+ostream & operator<<(ostream &cout, MyString & p) 
+{
+	cout << p.GetString() << endl;
+	// TODO: 在此处插入 return 语句
+	return cout;
+}
+istream & operator>>( istream &cin,MyString & p)
+{
+	if (p.m_MyString != NULL)
+	{
+		delete[] p.m_MyString;
+		p.m_MyString = NULL;
+	}
+	//char * buf;  //不能这样创建一个数组指针去接收 用户输入的东西
+	char buf[1024];//要创建具体空间去接受用户输入的东西
+	p.m_MyString = new char[strlen(buf) + 1];
+	cin >> buf;
+	strcpy(p.m_MyString,buf );
+	// TODO: 在此处插入 return 语句
+	return cin;
+}