[Boost-bugs] [Boost C++ Libraries] #2127: function_equal should work with nested binds

Subject: [Boost-bugs] [Boost C++ Libraries] #2127: function_equal should work with nested binds
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-07-18 13:33:46

#2127: function_equal should work with nested binds
-----------------------------------------------------------------------------+
 Reporter:  Gareth Sylvester-Bradley <gareth.sylvester-bradley_at_[hidden]>  |       Owner:  pdimov 
     Type:  Bugs                                                             |      Status:  new    
Milestone:  Boost 1.35.1                                                     |   Component:  bind   
  Version:  Boost 1.35.0                                                     |    Severity:  Problem
 Keywords:                                                                   |  
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 http://lists.boost.org/Archives/boost/2008/07/139992.php


 To fix the compiler error in the program below, add the following (e.g. to
 boost/bind.hpp) -

 {{{
 namespace boost
 {
   namespace _bi
   {
     template<class R, class F, class L> bool ref_compare( bind_t<R,F,L>
 const & a, bind_t<R,F,L> const & b, long )
     {
       return a.compare(b);
     }
   }
 }
 }}}
 -- main.cpp --
 {{{
 #include <boost/function_equal.hpp>
 #include <boost/bind.hpp>

 void f( int ) {}
 int g( int i ) { return i+5; }

 template < typename F > bool self_equal( F f_ )
 {
   return function_equal( f_, f_ );
 }

 int main( int argc, char * const argv[] )
 {
   self_equal( boost::bind( f, _1 ) ); // OK
   self_equal( boost::bind( g, _1 ) ); // OK
   self_equal( boost::bind( f, boost::bind( g, _1 ) ) ); // compiler
 error
   return 0;
 }
 }}}

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/2127>
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