Re: call member function without object-compile error

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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 15:12:35 +1200
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On 06/22/11 03:01 PM, eric wrote:
> Dear c++ advancer:
>    I have a simple c++ file, which is I copy and try to test from a
> book (C++ Primer 3rd Ed, by Stanley B. Lippman and Josee Lajoie,
> around page 904, chapter 17.3 Base Class Member Access)
> the following is my program:

<snip for brevity>

> -----------------------------
> the following is my g++ result(4.5.2)
> --------------------
> eric@eric-laptop:~/CppPrimer3$ g++ p904.cpp
> p904.cpp: In member function ‘bool NameQuery::compare0(const Query*)’:
> p904.cpp:36:24: error: ‘std::vector<std::pair<short int, short int>  >
> Query::_loc’ is protected
> p904.cpp:88:30: error: within this context
> p904.cpp: In function ‘int main()’:
> p904.cpp:96:30: error: cannot call member function ‘bool
> NameQuery::compare0(const Query*)’ without object
> eric@eric-laptop:~/CppPrimer3$
> --------------------------------------
> I just like to know how to fix (88:30) and (96:30)
> thanks a lot in advance, Eric

For the protected access, provide a public member function to return the 
vector size.

For the call, you have to have an instance of NameQuery to call a 
non-static member function.

As a general point, names starting with leading underscores may clash 
with names used by your implementation.

-- 
Ian Collins

Thread

call member function without object-compile error eric <cneric12lin0@gmail.com> - 2011-06-21 20:01 -0700
  Re: call member function without object-compile error Ian Collins <ian-news@hotmail.com> - 2011-06-22 15:12 +1200
    Re: call member function without object-compile error eric <cneric12lin0@gmail.com> - 2011-06-21 20:28 -0700
      Re: call member function without object-compile error Ian Collins <ian-news@hotmail.com> - 2011-06-22 15:55 +1200
        Re: call member function without object-compile error eric <cneric12lin0@gmail.com> - 2011-06-21 21:36 -0700
          Re: call member function without object-compile error Ian Collins <ian-news@hotmail.com> - 2011-06-22 16:43 +1200
            Re: call member function without object-compile error eric <cneric12lin0@gmail.com> - 2011-06-21 21:54 -0700

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