Build Error, Undefined reference to [function]

BecauseOthersWereTaken (2)
Hi, so I have written a program to help me learn virtual methods, and I get an error every time i build it, saying:
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<path>\12-10_DataSlicingWhenPassingByValue.o:12-10_DataSlicingWhenPassingByValue.cpp|| undefined reference to `PtrFunction(Mammal*)'|
||=== Build finished: 1 errors, 0 warnings ===|

even though I have clearly defined the function and implemented it
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#include <iostream>

using namespace std;

class Mammal
{
    public:
        Mammal():itsAge(1) {}
        virtual ~Mammal()  {}       //I suspect destructor needs to be virtual so that the derived class's destructor can be called?
        virtual void Speak() const {cout<< "Mammal speak!\n"; }

    protected:
        int itsAge;
};

class Dog : public Mammal
{
    public:
        void Speak() const {cout<< "Woof!\n";}

};

class Cat: public Mammal
{
    public:
        void Speak() const {cout<< "Meow!\n";}
};

void ValueFunction(Mammal);
void PtrFunction(Mammal*);
void RefFunction(Mammal&);

int main()
{
    Mammal* ptr = 0;
    int choice;
    while(1)
    {
        bool fQuit = false;
        cout<< "(1)dog (2)cat (0)Quit: ";
        cin >> choice;
        switch (choice)
        {
            case 0: fQuit = true;
                    break;
            case 1: ptr = new Dog;
                    break;
            case 2: ptr = new Cat;
                    break;
            default: ptr = new Mammal;
                     break;
        }

        if (fQuit == true)
            break;

        PtrFunction(ptr);
        RefFunction(*ptr);
        ValueFunction(*ptr);
    }//end while

    return 0;
}

void ValueFunction(Mammal MammalValue)
{
    MammalValue.Speak();
}

void PrtFunction(Mammal* pMammal)
{
    pMammal -> Speak();
}

void RefFunction(Mammal & rMammal)
{
    rMammal.Speak();
}


Is there something I am doing wrong?
Thanks in advance.

Edit: I have just realized this should probably be in beginner's forum, my apologies
Last edited on
guestgulkan (2942)
Spot the spelling mistake :-)
BecauseOthersWereTaken (2)
*facepalm
thanks!
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