id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11286	Code in boost/endian/buffers.hpp violates old C++03 Standard	Sergey.Sprogis@…	Beman Dawes	"1. Description of the failure. 

 endian/test/endian_in_union_test.cc fails with Oracle Studio C++ compiler on Solaris producing bunch of similar error message similar shown below::

 ""CC""   -KPIC -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I""../../.."" -o ""../../../bin.v2/libs/endian/test/endian_in_union_test.test/sun/release/stdlib-sun-stlport/threading-multi/endian_in_union_test.o"" ""endian_in_union_test.cpp""

""endian_in_union_test.cpp"", line 77: Error: A union member cannot have a user-defined assignment operator.

 2. Cause of the failure. 

 The failure can be demonstrated with 4 lines small independent t.cpp test:

   class endian_buffer {

      endian &endian_buffer = (int val);
   };

   union U { endian_buffer m; }; 

   CC -c t.cpp

   ""t.cc"", line 4: Error: A union member cannot have a user-defined assignment operator.

  Small test above has been  extracted  and slightly modified from the code shown below located under  boost/endian/buffers.hpp

    template <typename T, std::size_t n_bits>

    class endian_buffer< order::big, T, n_bits, align::no >

    {
        ....

        endian_buffer & operator=(T val) BOOST_NOEXCEPT   // Line 358
 
   C++03 Standard explicitly rejects the use of classes with user-defined assignment operators in unions:

   C++2003 9.5 [class.union]p1

   An object of a class with a ... non-trivial copy assignment operator (13.5.3, 12.8) cannot be a member of a union.

    In C++11  the code is valid, as a result of apply   ""Unrestricted Unions"" feature. 
    But since it is a C++11 feature, it should not  affect C++03 compilation. 

   Seems like g++  has a bug here compiling this code successfully in both C++03 and C++11 mode.
"	Bugs	closed	To Be Determined	endian	Boost 1.58.0	Problem	invalid		Aparna.Kumta@…