undefined reference, plz help

[Brian Budge]

On Wed, Jun 8, 2011 at 9:26 PM, eric lin <ericlin@fsshl.zzn.com> wrote:
>
> Dear gcc programers:
>
>  what may cause compile error (on 4.5.2 or maybe not)
> ------
>  g++ pg49.cpp
> /tmp/ccUvNoPf.o: In function `main':
> pg49.cpp:(.text+0x42): undefined reference to `IntArray::IntArray(int*, int)'
> pg49.cpp:(.text+0x5e): undefined reference to `IntArrayRC::IntArrayRC(int*, int)'
> /tmp/ccUvNoPf.o: In function `IntArray::~IntArray()':
> pg49.cpp:(.text._ZN8IntArrayD2Ev[_ZN8IntArrayD5Ev]+0xb): undefined reference to `vtable for IntArray'
> /tmp/ccUvNoPf.o: In function `IntArrayRC::~IntArrayRC()':
> pg49.cpp:(.text._ZN10IntArrayRCD2Ev[_ZN10IntArrayRCD5Ev]+0xb): undefined reference to `vtable for IntArrayRC'
> collect2: ld returned 1 exit status
> --------
> eric  /* I am happy to supply code I compiled, plz show up your private email address or email me privately */
>
>
>
>

This means that you've declared, but not defined those constructors.
At link time, the linker cannot find the code for those functions.

  Brian