Re: [boost] #pragma once

From: Gennaro Prota (gennaro_prota_at_[hidden])
Date: 2002-12-28 13:55:54

--- Alberto Barbati <abarbati_at_[hidden]> wrote:

> or even better:
> 
> #if _MSC_VER+0 >= 1020
> #pragma once
> #endif
> 
> But not only MS compilers have the pragma once, which is in my opinion 
> very useful.

IMHO a pragma once, or similar directive, is only useful in that it doesn't
force you to "invent" a unique name for the included source file (because it
specifies no name at all). The fact that it is useful to reduce compilation
time is just a result of some compiler writers' attitude to prefer encouraging
the use of non-standard features rather than e.g. recognizing the include guard
idiom and optimize away the subsequent #includes (as for instance g++ does).

Genny.

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