On Wed, Jun 8, 2011 at 9:26 PM, eric lin <ericlin@xxxxxxxxxxxxx> 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
