Use of angle brackets around file names for include statements

[elfring]

Would you like to replace any double quotes by angle brackets around file names for include statements?

[animetrics]

I'm not sure that is necessary. I prefer the double quotes because most compiler implementations search the local directory of the file with the include statement first, which does not force the user to install in a standard location. Whereas using <> does force the user to install in a standard location because most implementations will not search the local directory.

Both <> and "" are implementation dependent according to the standard anyway.

On Tue, Nov 10, 2015 at 10:11:39AM -0800, Markus Elfring wrote:

Would you like to replace any double quotes by angle brackets around file names for include statements?

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[elfring]

I suggest to reconsider the consequences of the following wording from the section "16.2 Source file inclusion" in the standard specification for the programming language "C++".

…
The named source file is searched for in an implementation-defined manner. If this search is not supported, or if the search fails, the directive is reprocessed as if it read

#include <h-char-sequence> new-line
…

• How do you think about to avoid "a duplicated file search" here?
• Would you like to restrict the searched directories for header files of your software?

[animetrics]

I do not understand the problem you are trying to solve?

On Tue, Nov 10, 2015 at 10:55:41AM -0800, Markus Elfring wrote:

I suggest to reconsider the consequences of the following wording from the section "16.2 Source file inclusion" in the standard specification for the programming language "C++".

… The named source file is searched for in an implementation-defined manner. If this search is not supported, or if the search fails, the directive is reprocessed as if it read

#include new-line …

• How do you think about to avoid "a duplicated file search" here? • Would you like to restrict the searched directories for header files of your software?

— Reply to this email directly or view it on GitHub.*

[elfring]

There are different opinions about the handling of the involved implementation-defined behaviour.

• Will header files be also searched outside the specified include directories if double quotes are used for the discussed preprocessor statement?
• Is there a speed difference measurable if a file is not found there and the search will be retried with "the angle brackets inclusion method"?