#pragma once equivalent for c++builder

Question

Is there anything equivalent to #pragma once for Codegear RAD Studio 2009?

I am using the precompiled header wizard and I would like to know if it is still necessary to use include guards when including header files?

what would have speaken against trying it out yourself? – Sebastian Mach Feb 09 '10 at 08:49 — Sebastian Mach, Feb 09 '10 at 08:49

score 5 · Accepted Answer · answered Feb 10 '10 at 17:26

Support for #pragma once was added in C++Builder 2010 In C++Builder 2009 and earlier, the unknown pragma will simply be ignored. I would suggest using

#ifndef X 
#define X
//code 
#endif

style header guards in the versions of C++Builder that do not support #pragma once.

score 1 · Answer 2 · answered Feb 09 '10 at 06:09

1

Rad Studio supports #pragma once, along with all of the following.

answered Feb 09 '10 at 06:09

JRL

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Excellent. The installed help must have been out of date. – Seth Feb 09 '10 at 06:32
1

Please note that support for #pragma once was only added in C++Builder 2010 and was not available in C++Builder 2009 and earlier. – David Dean Feb 09 '10 at 16:29
oh in that case - unmarking as correct answer. @David you should post that comment as the correct answer. – Seth Feb 09 '10 at 22:49
@David see follow up question regarding if 2009 has header-include-guard-optimisation, even though it doesn't use the `#pragma once` directive. http://stackoverflow.com/questions/2233401/are-redundant-include-guards-necessary – Seth Feb 10 '10 at 00:11
I'm not getting anything under http://docwiki.embarcadero.com/RADStudio/en/Pragma_Directives_Overview_Index -> 503 Service Unavailable – Wolf Nov 21 '17 at 15:28

#pragma once equivalent for c++builder

2 Answers2