[Boost-bugs] [Boost C++ Libraries] #3739: Generalizing identity_property_map for arbitrary types

Subject: [Boost-bugs] [Boost C++ Libraries] #3739: Generalizing identity_property_map for arbitrary types
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-12-08 23:55:06

#3739: Generalizing identity_property_map for arbitrary types
------------------------------+---------------------------------------------
 Reporter:  noel_belcourt     |       Owner:  jewillco      
     Type:  Feature Requests  |      Status:  new           
Milestone:  Boost 1.42.0      |   Component:  property_map  
  Version:  Boost 1.41.0      |    Severity:  Not Applicable
 Keywords:                    |  
------------------------------+---------------------------------------------
 On Tue, 8 Dec 2009, Belcourt, Kenneth wrote:

 Hi,

 I've found the property map library to be very useful and would like to
 propose a minor enhancement to permit the identity_property_map to work
 for
 arbitrary types.  The reason for this is that some computationally
 intensive
 algorithms suffer noticeable performance degradation when I convert them
 to
 generic algorithms using property maps.  Having a typed identity property
 map
 that returns, for example, the double passed into it significantly speeds
 up
 our algorithms, at least for those fields that are not mutable.

 I've attached a patch, and could supply a motivating example, if anyone is
 interested.

 -- Noel

 I don't see a patch attached to your email.  Could you please file a
 feature request on Trac for property_map?  Thank you.

 -- Jeremiah Willcock
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Ticket URL: <https://svn.boost.org/trac/boost/ticket/3739>
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