Code-Bin #667

untitled C++ Code
Posted by: bk | June 2, 2010 @ 10:10pm

C++ Code

#include <cstring>
#include "string.h"

namespace ctm {
	int string::num_strings = 0; //initialize static class member
	
	int string::HowMany() {		 //static method
		return num_strings;
	}
	
	//class methods
	string::string(const char *s) { //construt string from c-string
		len = std::strlen(s);		//set size
		str = new char [len + 1];	//allocate proper memory size
		std::strcpy(str, s);		//initialize pointer
		
		num_strings++;
	}
	
	string::string() {
		len = 4;
		str = new char [4];
		str[0] = '\0';
		
		num_strings++;
	}
	
	string::string(const string &st) {
		num_strings++;
		len = st.len; //same length
		str = new char [len + 1];
		std::strcpy(str, st.str); //copy string to new location
	}
	
	string::~string() {
		--num_strings;
		delete [] str;
	}
	
	//overloaded operators
	
	//assign a string to a string
	string &string::operator=(const string &st) { //assignment
		if (this == &st) 
			return *this;
		
		delete [] str;
		len = st.len;
		str = new char [len + 1];
		std::strcpy(str, st.str);
		
		return *this;
	}
	
	//assign a c-string to a string
	string &string::operator=(const char *s) {
		delete [] str;
		len = std::strlen(s);
		str = new char [len + 1];
		std::strcpy(str, s);
		
		return *this;
	}
	
	//read-write char access for NON-CONST string
	char &string::operator[](int i) {
		return str[i];
	}
	
	//read-only acess access for cons string
	const char &string::operator[](int i) const {
		return str[i];
	}
	
	//overloaded friends
	bool operator<(const string &st, const string &st2) {
		return (std::strcmp(st.str, st2.str) < 0);
	}
	
	bool operator>(const string &st, const string &st2) {
		return (st2.str < st.str);
	}
	
	
	bool operator==(const string &st, const string &st2) {
		return (std::strcmp(st.str, st2.str) == 0);
	}
	 
	
	//output and input
	
	std::ostream &operator<<(std::ostream &os, const string &st) {
		os << st.str;
		
		return os;
	}
	
	/*std::istream &operator>>(std::istream &is, const string &st) {
		char temp[string::CINLIM];
		is.get(temp, string::CINLIM);
		if (is) {
			st = temp;
		}
		
		while (is && is.get() != '\n') {
			continue;
		}
		
		return is;
	}*/
	
}

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