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Subject: Re: [boost] Mixed use of "include" directives with quoted vs. angle-bracketed params, causing havoc
From: Victor V. Terber (victor_at_[hidden])
Date: 2008-09-07 12:37:11

Michael Fawcett wrote:
> Now, isn't there a slight performance and semantic difference?
Semantic difference: With quotes you search an implementation defined path
first, only then search the (also implementation-defined) paths you would
have searched with angled bracket.

> performance
Not generally predictable, as it depends where the files are actually
placed. But the maximum number of places to look at is guaranteed to be
equal or less with angled brackets than with quotes.

> Doesn't <> mean search compiler dependent search path for file, then
> search user supplied paths in order supplied, and "" means search
> user supplied path in order supplied, then fall back to compiler
> dependent path?
No, that is not guaranteed. It's wholly implementation-defined (according
to the standard, paragraph 16.2.3). That may (or may not) involve e.g.
concepts like "current directory", "any directories in the call graph" etc.
  As it says: "implementation-defined".

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