On Sun, Sep 7, 2008 at 12:37 PM, Victor V. Terber <victor@terber.de> wrote:
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.
I think that means for libraries it makes more sense to use angle brackets. Boost headers don't rely on any such thing as a "current directory", they require the boost path in the include search path, therefore, the semantics (and maybe performance?) favor angle brackets.
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".
Thanks for the reference, I didn't have a copy handy at home (only at work). --Michael Fawcett