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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 15:55:59 +1200
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On 06/22/11 03:28 PM, eric wrote:
> On Jun 21, 8:12 pm, Ian Collins<ian-n...@hotmail.com>  wrote:
>> 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.
>
> Thanks your reply and suggestion
> but after I change leading underscore to a_ (add an "a" in front of
> all _variablename)
> my g++ still response name error : Cann't call memeber function
> without object on (88:30 and 96:30) /* try by yourself */
> so
> still need any advancer's help and suggestion and thanks a lot in
> advance, Eric

What about the other two suggestion to fix your actual problem?

-- 
Ian Collins