[Boost-bugs] [Boost C++ Libraries] #7365: warning: type qualifiers ignored on function return type

Subject: [Boost-bugs] [Boost C++ Libraries] #7365: warning: type qualifiers ignored on function return type
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-09-11 10:03:52

#7365: warning: type qualifiers ignored on function return type
------------------------------+---------------------------------------------
 Reporter:  anonymous         |       Owner:  rogeeff
     Type:  Bugs              |      Status:  new    
Milestone:  To Be Determined  |   Component:  test   
  Version:  Boost 1.50.0      |    Severity:  Problem
 Keywords:                    |  
------------------------------+---------------------------------------------
 Dears,

 I have some flood of warnings like:

 ../../../../externals/boost/test/utils/basic_cstring/basic_cstring.hpp: In
 instantiation of 'boost::unit_test::basic_cstring<const char>':
 ../../../../externals/boost/test/predicate_result.hpp:73:   instantiated
 from here
 ../../../../externals/boost/test/utils/basic_cstring/basic_cstring.hpp:209:
 warning: type qualifiers ignored on function return type
 ../../../../externals/boost/test/utils/basic_cstring/basic_cstring.hpp:218:
 warning: type qualifiers ignored on function return type

 My explanation is that, the problem is in basic_cstring function, that
 works with "const T" and "T" as template, but return type ignores "const"
 qualifier when returns copy of the object.

 The compiler ignores in return type when using const T instead of T.

 It seems to be because:

 basic_cstring<CharT>::value_type

 for

 "basic_cstring<const char>::value_type == const char" but
 "const char == char" when returned as value.

 I do not see simple patch without using e.g. Boost::MPL and remove const
 when return value is done as copy by value.

 Regards,

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7365>
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