编写类String的构造函数，拷贝构造函数，析构函数和赋值函数

最新推荐文章于 2019-12-31 14:50:42 发布

原创最新推荐文章于 2019-12-31 14:50:42 发布 · 443 阅读

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#string #null #delete #include

本文介绍了一个简单的C++自定义字符串类的实现过程，包括构造函数、拷贝构造函数、析构函数及赋值运算符重载等核心成员函数。通过这些函数确保了类能够正确地管理内存并支持基本的字符串操作。

#include <assert.h> #include <string> class String { public: String(const char* pChar); String(const String& other); ~String(); String & operator=(const String & other); private: char * m_Char; }; //Construct function String::String(const char * pChar) { if( pChar == NULL) { assert((m_Char = new char[1]) != NULL); *m_Char = '/0'; } else { assert((m_Char = new char[strlen(pChar) + 1]) != NULL); strcpy(m_Char, pChar); } } // Copy Construct function String::String(const String& other) { if(other.m_Char == NULL) m_Char = NULL; else { assert((m_Char = new char[strlen(other.m_Char) + 1]) != NULL); strcpy(m_Char, other.m_Char); } } //Destruct function String::~String() { delete [] m_Char; m_Char = NULL; } // operator = function String& String::operator =(const String &other) { assert(this != &other); delete [] m_Char; if(other.m_Char == NULL) m_Char = NULL; else { assert((m_Char = new char[strlen(other.m_Char) + 1]) != NULL); strcpy(m_Char, other.m_Char); } return *this; }