For a project I'm doing for class I have to make a virtual method in a class. A subclass will inherit the virtual method and instantiate it in a separate .cpp file. The problem I'm having is that I need the class that has the virtual method to instantiate its version of the method as well as the subclass. I get an error that says "cannot instantiate an abstract class" even though it is instantiated in a .cpp.
Here's my code:
Subdomain.h
#pragma once
#include "String.h"
using namespace std;
class SubdomainPart
{
public:
SubdomainPart() {}
// Sets the Address
SubdomainPart(const String& address);
virtual bool IsValid() = 0;
private:
String Address;
};Subdomain.cpp
#include "SubdomainPart.h"
#include "Validation.h"
#include "Definitions.h"
#include "String.h"
SubdomainPart::SubdomainPart(const String& address)
{
Address = address;
}
// Implements subdomain validation rules
bool SubdomainPart::IsValid()
{
// 1) Check size
if(Address.GetLength() > MAX_DOMAIN_SIZE)
return false;
// 2) Check for valid characters
int check = Address.Find_First_Not_Of(VALID_LOCALPART_CHARS);
if(check != String::npos)
return false;
// 3) Check dot/dash rule
if(!DotDashRules(Address))
return false;
return true;
}Subclass.h:
#pragma once
#include "SubdomainPart.h"
#include "String.h"
#include "Vector.h"
using namespace std;
class TldPart : public SubdomainPart
{
public:
TldPart() {}
void Set(String &source);
static void PreloadTlds();
static Vector<String> Tlds;
bool IsValid();
private:
String Address;
};Subclass.cpp:
#pragma once
#include "SubdomainPart.h"
#include "String.h"
#include "Vector.h"
using namespace std;
bool TldPart::IsValid()
{
String newTld;
for(int i=0; i<Tlds.GetSize(); i++)
{
//Forces uppercase
toLower(Tlds[i]);
if(Tlds[i] != Address)
return false;
}
return true;
}