Created
June 6, 2015 21:50
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Implentation of String class with rule of three
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| #include<iostream> | |
| #include<cstring> | |
| //Implentation of String class with rule of three | |
| class String | |
| { | |
| public: | |
| String(const char* args) | |
| : data_(new char[std::strlen(args) + 1]), length_(std::strlen(args)) | |
| { | |
| std::strcpy(data_,args); | |
| } | |
| String(const String& that) // copy constructor | |
| { | |
| copyOther(); | |
| } | |
| //assignment operator | |
| /* | |
| Handles the following cases | |
| 1. Self-assignment | |
| MyClass one; | |
| one = one; | |
| 2. Operator must yield result | |
| MyClass one, two, three; | |
| three = two = one; | |
| */ | |
| String& operator=(const String& other) { | |
| if(this != &other) { // To handle self-assignment | |
| clear(); | |
| copyOther (); | |
| } | |
| return *this; | |
| } | |
| ~String() //destructor | |
| { | |
| clear() | |
| } | |
| //helper function | |
| void copyOther() { | |
| data_ = new char[std::strlen(that.data_) + 1]; | |
| std::strcpy(data_, that.data_); | |
| length_ = that.length_; | |
| } | |
| void clear() { | |
| delete[] data_; | |
| } | |
| private : | |
| char* data_; | |
| size_t length_; | |
| //String& operator=(const String&); | |
| //String(const String& that); | |
| }; | |
| int main () { | |
| } |
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