#include<iostream>
#include<string>
#include"String.h"

using namespace std;

String::String()
{
	pString = NULL;
}

String::String( const char* const newString )
{
	pString = NULL;
	set( newString );
}

String::String( const String& newString )
{
	pString = NULL;
	set( newString.pString);
}

String::~String()
{
	destroy();
}

void String::destroy()
{
	if( pString != NULL )
	{
		delete []pString;
		pString = NULL;
	}
}

void String::set( const char* const newString )
{
	destroy();

	if( newString != NULL )
	{
		pString = new char[strlen(newString) + 1];
		strcpy( pString, newString );
	}
	else
	{
		pString = NULL;
	}
}
void String::set( const String& newString )
{
	set( newString.pString );
}

bool String::isEmpty()
{
	//when pString is null the condition will short circuit
	return ( pString == NULL  || strlen( pString ) == 0 );
}

void String::write(ostream& out)
{
	if( pString != NULL)
	{
		out << pString;
	}
}