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From: Ian Collins <ian-news@hotmail.com>
Newsgroups: comp.lang.c++
Subject: Re: call member function without object-compile error
Date: Wed, 22 Jun 2011 16:43:29 +1200
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On 06/22/11 04:36 PM, eric wrote:
> -------------------------
> my g++ reponse linker error
> --------------
> eric@eric-laptop:~/CppPrimer3$ g++ p904.cpp
> /tmp/ccBLCYgi.o: In function `NameQuery::NameQuery()':
> p904.cpp:(.text._ZN9NameQueryC2Ev[_ZN9NameQueryC5Ev]+0xe): undefined
> reference to `Query::Query()'
> p904.cpp:(.text._ZN9NameQueryC2Ev[_ZN9NameQueryC5Ev]+0x17): undefined
> reference to `vtable for NameQuery'
> /tmp/ccBLCYgi.o: In function `NameQuery::~NameQuery()':
> p904.cpp:(.text._ZN9NameQueryD2Ev[_ZN9NameQueryD5Ev]+0xc): undefined
> reference to `vtable for NameQuery'
> collect2: ld returned 1 exit status
> eric@eric-laptop:~/CppPrimer3$
> ----------------------------------
> Need any advancer's suggestion and help again, and thanks a lot in
> advance, Eric

Your base class default constructor and virtual method don't have bodies.

-- 
Ian Collins