[Boost-bugs] [Boost C++ Libraries] #11663: No way to query file extension without allocating memory

Subject: [Boost-bugs] [Boost C++ Libraries] #11663: No way to query file extension without allocating memory
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-09-17 06:44:37

#11663: No way to query file extension without allocating memory
--------------------------------+--------------------------
 Reporter:  matthew.chaplain@…  |      Owner:  bemandawes
     Type:  Feature Requests    |     Status:  new
Milestone:  To Be Determined    |  Component:  filesystem
  Version:  Boost 1.57.0        |   Severity:  Optimization
 Keywords:                      |
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 the function .extension() returns an fs::path, containing a fresh string
 that contains the extension.  On certain library implementations that
 don't implement the SSO -- or, I guess, for files with very long
 extensions -- there will be a memory allocation each time the function is
 called.

 That means that for solutions implementing search-by-extension such as is
 written in:

 http://stackoverflow.com/questions/11140483/how-to-get-list-of-files-

 with-a-specific-extension-in-a-given-folder

 there could be hundreds of memory allocations for just iterating a
 directory structure.  IMO, there really shouldn't be.

 I propose adding the function bool path::has_extension(string const&)
 which can compare the extension in a memory-friendly way.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11663>
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