Re: Forritunarverkefni 3 -- Tolvunarfraedi2-04

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Subject: Re: Forritunarverkefni 3

Author:
Hj�lmt�r

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Date Posted: 19:45:11 04/18/04 Sun
In reply to: 's message, "Forritunarverkefni 3" on 18:40:28 04/18/04 Sun

>Til gamans langadi mig ad spyrja hvad thessar
>setningar gerdu i leikm.h sem thu settir a netid.
>
>#ifndef LEIKM_H
>#define LEIKM_H

�etta er standardtrikk til �ess a� skilgreiningar komi ekki fyrir oftar en einu sinni. Ef vi� h�fum skilgreiningar
� .h-skr� �� urfa kannski margar .cpp-skr�r a� hafa ��r me�, sem er gert me� '#include "leikm.h"'. �a� ��ir ��
a� sami klasi er skilgreindur oft (eins oft og .h-skr�in er include-eru�). Til a� innihald .h-skr�rinnar s� a�eins
��tt einu sinni �� er �a� afmarka� me�:



#ifndef XXXX

#define XXXX

  [einhverjar skilgreiningar]

#endif

Allar skipanir sem byrja � # eru fyrir "for��anda" (e. preprocessor), sem skilur skipanir sem ekki eru beint C++.
H�r ��ir fyrsta skipunina a� ef t�kni� XXXX er ekki skilgreint ��... S��an er t�kni� XXXX skilgreint. Ef
for��andinn s�r �essa skr� aftur �� ver�ur if-setninging ekki s�nn (�.e. t�kni� XXXX hefur veri� skilgreint) og
innihaldi .h-skr�rinnar er sleppt og vi� f�um �v� ekki endurteknar skilgreiningar.

Einfaldasta lei�in til a� sj� hvernig �etta virkar er a� kippa �essum l�num �t og sj� hva�a ��endavillu �i� f�i�.
��r ver�a eitthva� um "Multiple definition of...".

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