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Re: .h and .cpp

From "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com>
Newsgroups comp.lang.c++
Subject Re: .h and .cpp
Date 2011-11-29 10:57 +0100
Organization A noiseless patient Spider
Message-ID <jb2aa1$g0$1@dont-email.me> (permalink)
References <d30834a8-3bf4-49a4-b1eb-b66aef965475@i8g2000vbh.googlegroups.com> <72e0c6ca-1269-4e1d-9cf9-be78ec0c4584@y6g2000yqe.googlegroups.com>

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On 28.11.2011 19:58, Goran wrote:
> On Nov 28, 6:20 pm, Christopher<cp...@austin.rr.com>  wrote:
>
>> 1b) A .h file should never contain class implementation (except for
>> inline functions or methods)
>
> Purely mechanically, this doesn't work due to C compilation model: if
> the class parts are defined in a header, and said header is included
> in more than one translation unit (source file), linker will encounter
> duplicate symbols.

I think the above is perhaps too vaguely expressed.

First, a "class definition" does not necessarily include definitions of 
member functions.

Secondly, it's quite common to put also definitions of member functions 
in a header. They need then to be either templates or `inline`. For 
example, many Boost sub-libraries are header only.


Cheers & hth.,

- Alf

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Thread

.h and .cpp Christopher <cpisz@austin.rr.com> - 2011-11-28 09:20 -0800
  Re: .h and .cpp Leigh Johnston <leigh@i42.co.uk> - 2011-11-28 17:30 +0000
    Re: .h and .cpp Christopher <cpisz@austin.rr.com> - 2011-11-28 10:39 -0800
      Re: .h and .cpp Tobias Müller <troplin@bluewin.ch> - 2011-11-28 19:09 +0000
  Re: .h and .cpp ralph <nt_consulting64@yahoo.net> - 2011-11-28 12:37 -0600
    Re: .h and .cpp Christopher <cpisz@austin.rr.com> - 2011-11-28 10:48 -0800
      Re: .h and .cpp ralph <nt_consulting64@yahoo.net> - 2011-11-28 14:24 -0600
      Re: .h and .cpp yatremblay@bel1lin202.(none) (Yannick Tremblay) - 2011-11-30 11:24 +0000
        Re: .h and .cpp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-12-01 21:42 +0000
          Re: .h and .cpp Rui Maciel <rui.maciel@gmail.com> - 2011-12-02 02:03 +0000
            Re: .h and .cpp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-12-02 20:59 +0000
  Re: .h and .cpp "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2011-11-28 19:45 +0100
    Re: .h and .cpp Leigh Johnston <leigh@i42.co.uk> - 2011-11-28 19:03 +0000
      Re: .h and .cpp "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2011-11-28 20:36 +0100
    Re: .h and .cpp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-28 22:52 +0000
      Re: .h and .cpp yatremblay@bel1lin202.(none) (Yannick Tremblay) - 2011-11-30 11:39 +0000
        Re: .h and .cpp Juha Nieminen <nospam@thanks.invalid> - 2011-11-30 12:50 +0000
          Re: .h and .cpp yatremblay@bel1lin202.(none) (Yannick Tremblay) - 2011-11-30 13:57 +0000
            Re: .h and .cpp Juha Nieminen <nospam@thanks.invalid> - 2011-11-30 15:06 +0000
          Re: .h and .cpp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-30 16:21 +0000
        Re: .h and .cpp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-30 16:12 +0000
  Re: .h and .cpp Goran <goran.pusic@gmail.com> - 2011-11-28 10:58 -0800
    Re: .h and .cpp Christopher <cpisz@austin.rr.com> - 2011-11-28 13:30 -0800
      Re: .h and .cpp Tobias Müller <troplin@bluewin.ch> - 2011-11-29 06:44 +0000
      Re: .h and .cpp Goran <goran.pusic@gmail.com> - 2011-11-29 01:17 -0800
      Re: .h and .cpp Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-30 00:53 -0800
    Re: .h and .cpp "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2011-11-29 10:57 +0100
    Re: .h and .cpp yatremblay@bel1lin202.(none) (Yannick Tremblay) - 2011-11-30 12:05 +0000
  Re: .h and .cpp Rui Maciel <rui.maciel@gmail.com> - 2011-11-28 20:07 +0000
  Re: .h and .cpp Geoff <geoff@invalid.invalid> - 2011-11-28 12:17 -0800
    Re: .h and .cpp Ian Collins <ian-news@hotmail.com> - 2011-11-29 11:41 +1300
      Re: .h and .cpp gwowen <gwowen@gmail.com> - 2011-11-29 07:37 -0800
    Re: .h and .cpp Goran <goran.pusic@gmail.com> - 2011-11-29 00:08 -0800
    Re: .h and .cpp Daniel <danielaparker@gmail.com> - 2011-11-29 08:31 -0800
      Re: .h and .cpp ralph <nt_consulting64@yahoo.net> - 2011-11-29 14:49 -0600
        Re: .h and .cpp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-30 00:21 +0000
  Re: .h and .cpp Andy Champ <no.way@nospam.invalid> - 2011-11-28 21:30 +0000
  Re: .h and .cpp Paavo Helde <myfirstname@osa.pri.ee> - 2011-11-28 18:05 -0600
  Re: .h and .cpp Paavo Helde <myfirstname@osa.pri.ee> - 2011-11-28 18:27 -0600
  Re: .h and .cpp Juha Nieminen <nospam@thanks.invalid> - 2011-11-29 07:55 +0000
    Re: .h and .cpp Christopher <cpisz@austin.rr.com> - 2011-11-29 12:15 -0800
      Re: .h and .cpp Leigh Johnston <leigh@i42.co.uk> - 2011-11-29 20:19 +0000
        Re: .h and .cpp Christopher <cpisz@austin.rr.com> - 2011-11-29 12:31 -0800
          Re: .h and .cpp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-30 00:31 +0000
        Re: .h and .cpp Juha Nieminen <nospam@thanks.invalid> - 2011-11-30 09:43 +0000
      Re: .h and .cpp Ian Collins <ian-news@hotmail.com> - 2011-11-30 09:23 +1300

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