Re: [Boost-bugs] [Boost C++ Libraries] #1915: Nested matrix products with transposes causes compiler to complain error: invalid application of ‘sizeof’

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #1915: Nested matrix products with transposes causes compiler to complain error: invalid application of ‘sizeof’
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-05-14 21:56:28

#1915: Nested matrix products with transposes causes compiler to complain error:
invalid application of ‘sizeof’
-------------------------------------------+--------------------------------
  Reporter:  Leo Singer <aronnax_at_[hidden]>  |       Owner:  guwi17                    
      Type:  Support Requests              |      Status:  assigned                  
 Milestone:  To Be Determined              |   Component:  uBLAS                     
   Version:  Boost 1.34.1                  |    Severity:  Cosmetic                  
Resolution:                                |    Keywords:  ublas trans nested product
-------------------------------------------+--------------------------------
Changes (by guwi17):

  * keywords:  ublas trans => ublas trans nested product
  * status:  new => assigned
  * type:  Bugs => Support Requests
  * severity:  Problem => Cosmetic
  * milestone:  Boost 1.36.0 => To Be Determined

Comment:

 the compilation failure is by design. You see this from the
 STATIC_ASSERTION_FAILURE which causes a compiler error. However, I agree
 that the error message itself is not very helpful.

 Actually any nested product should cause a static assertion since the
 numerical complexity of the expression prod(prod(A,B),C) is far bigger
 that for the approach using a temporary: temp = prod(A,B); prod(temp,C);

 (see http://www.crystalclearsoftware.com/cgi-

 bin/boost_wiki/wiki.pl?Effective_UBLAS section "Controlling the complexity
 of nested products")

 Actually any nested product without temporaries should cause a static
 assertion. I'll check this in a few days.

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/1915#comment:1>
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