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AdeshAtole/MyString.cpp

Created August 10, 2016 05:06
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MyString.cpp
#include "MyString.h"
#include<stdexcept>
MyString::MyString()
{
string = NULL;
}
MyString::MyString(const char *string)
{
this->string = new char[strlen(string) + 1];
strcpy_s(this->string, strlen(string) + 1, string);
}
MyString::MyString(const MyString &string) {
if (string.string) {
this->string = new char[string.length() + 1];
strcpy_s(this->string, string.length() + 1, string.string);
}
else {
this->string = NULL;
}
}
size_t MyString::length() const {
if (string)
return strlen(string);
else
return 0;
}
MyString & MyString::operator=(const char * str)
{
if (string) {
delete string;
string = NULL;
}
this->string = new char[strlen(str) + 1];
strcpy_s(this->string, strlen(str) + 1, str);
return *this;
}
MyString & MyString::operator=(const MyString &string)
{
if (this->string) {
delete this->string;
this->string = NULL;
}
if (string.string) {
this->string = new char[strlen(string.string) + 1];
strcpy_s(this->string, strlen(string.string) + 1, string.string);
}
return *this;
}
bool MyString::operator<(const MyString & string) const
{
if (strcmp(this->string, string.string) < 0) {
return true;
}
return false;
}
bool MyString::operator==(const MyString & string) const
{
if (strcmp(this->string, string.string) == 0) {
return true;
}
return false;
}
bool MyString::operator!=(const MyString & string) const
{
return !(*this == string);
}
MyString MyString::operator+(const MyString & string)
{
if (this->string == NULL) {
*this = string;
return *this;
}
else {
char *temp;
temp = new char[strlen(this->string) + strlen(string.string) + 1];
strcpy_s(temp, strlen(this->string) + 1, this->string);
strcat(temp, string.string);
MyString myString(temp);
delete temp;
return myString;
}
}
ostream& operator<<(ostream &os, const MyString &string) {
if (string.string) {
os << string.string;
}
return os;
}
istream & operator >> (istream & is, MyString &string)
{
char buffer[1024];
is >> buffer;
if (string.string) {
delete string.string;
string.string = NULL;
}
string.string = new char[strlen(buffer) + 1];
strcpy_s(string.string, strlen(buffer) + 1, buffer);
return is;
}
const char* MyString::data() const {
return string;
}
char MyString::charAt(int index) const
{
if (index > length() - 1 || index<0) {
throw std::out_of_range("out of range");
}
return string[index];
}
MyString::~MyString()
{
if (string) {
delete string;
string = NULL;
}
}
Raw
MyString.h
#pragma once
#include<iostream>
#include<cstring>
using namespace std;
class MyString
{
char *string;
public:
MyString();
MyString(const char *string);
MyString(const MyString& string);
size_t length() const;
const char *data() const;
char charAt(int index)const;
MyString& operator=(const char* str);
MyString& operator=(const MyString &string);
bool operator<(const MyString &string) const;
bool operator==(const MyString &string) const;
bool operator!=(const MyString &string) const;
MyString operator+(const MyString &string);
virtual ~MyString();
friend ostream& operator<<(ostream &os, const MyString &string);
friend istream& operator >> (istream &is, MyString &string);
};
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