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Maybe a Bug in Cygwin in using Pointers to class fuctions
- To: cygwin@sourceware.cygnus.com
- Subject: Maybe a Bug in Cygwin in using Pointers to class fuctions
- From: "Ward Correll" <wardless@hotmail.com>
- Date: Mon, 02 Aug 1999 16:52:14 EDT
Maybe a bug in Cygwin! I think that this sorce code is correct in the Final
ANSI\ISO standard on C++ so I think it could be cygwin. Please check it out
for me in this simple code.
//Maybe a bug (in Cygwin) in using a pointer to a class fuction
#include <iostream.h>
class Mammal
{
public:
Mammal():itsAge(1) { }
virtual ~Mammal() { }
virtual void Speak() const = 0;
virtual void Move() const = 0;
protected:
int itsAge;
};
class Dog : public Mammal
{
public:
void Speak()const { cout << "Woof!\n"; }
void Move() const { cout << "Walking to heel...\n"; }
};
class Cat : public Mammal
{
public:
void Speak()const { cout << "Meow!\n"; }
void Move() const { cout << "slinking...\n"; }
};
class Horse : public Mammal
{
public:
void Speak()const { cout << "Winnie!\n"; }
void Move() const { cout << "Galloping...\n"; }
};
int main()
{
void (Mammal::*pFunc)() const =0;
Mammal* ptr =0;
int Animal;
int Method;
bool fQuit = false;
while (fQuit == false)
{
cout << "(0)Quit (1)dog (2)cat (3)horse: ";
cin >> Animal;
switch (Animal)
{
case 1: ptr = new Dog; break;
case 2: ptr = new Cat; break;
case 3: ptr = new Horse; break;
default: fQuit = true; break;
}
if (fQuit)
break;
cout << "(1)Speak (2)Move: ";
cin >> Method;
switch (Method)
{
case 1: pFunc = Mammal::Speak; break;
default: pFunc = Mammal::Move; break;
}
(ptr->*pFunc)();
delete ptr;
}
return 0;
}
=========================OUTPUT FROM CYGWIN==========================
BASH.EXE-2.02$ c++ -o try try.cpp
test.cpp: In function `int main()':
test.cpp:66: assuming & on `Mammal::Speak'
test.cpp:67: assuming & on `Mammal::Move'
=====================================================================
I know I want the fuction pointer to assume on Mammal::Speak or Mammal::Move
when meets some conditions as you see. But cygwin won't let me do that.
Anyway to force compiling?
Thanks!!! if you gave it a try.
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