[Boost-bugs] [Boost C++ Libraries] #3984: utility/swap std_bitset regression failure on msvc-10 (RC)

Subject: [Boost-bugs] [Boost C++ Libraries] #3984: utility/swap std_bitset regression failure on msvc-10 (RC)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-03-07 10:55:08

#3984: utility/swap std_bitset regression failure on msvc-10 (RC)
--------------------------+-------------------------------------------------
 Reporter:  niels_dekker  |       Owner:  niels_dekker
     Type:  Bugs          |      Status:  new         
Milestone:  Boost 1.43.0  |   Component:  utility     
  Version:  Boost 1.42.0  |    Severity:  Problem     
 Keywords:                |  
--------------------------+-------------------------------------------------
 [https://svn.boost.org/trac/boost/browser/trunk/libs/utility/swap/test/std_bitset.cpp?rev=53141

 boost/trunk/libs/utility/swap/test/std_bitset.cpp revision 53141] does:
 {{{
     typedef std::bitset<8> bitset_type;
     const bitset_type initial_value1 = 1ul;
     const bitset_type initial_value2 = 2ul;
 }}}

 Microsoft Visual C++ 10 RC rejects this piece of code, according to
 http://www.boost.org/development/tests/trunk/developer/output/RWVC10

 -boost-bin-v2-libs-utility-swap-test-std_bitset-test-msvc-10-0-debug-
 threading-multi.html which says:
 {{{
  Test output: RWVC10 - utility/swap - std_bitset / msvc-10.0
 Rev 60096 / Wed, 3 Mar 2010 11:41:12 +0000
 Report Time: Wed, 3 Mar 2010 23:58:03 +0000

 Compile [2010-03-03 16:35:50 UTC]: fail

     call "C:/Program Files (x86)/Microsoft Visual Studio
 10.0/VC/vcvarsall.bat" x86 >nul
 cl /Zm800 -nologo
 @"C:\run\results\boost\bin.v2\libs\utility\swap\test\std_bitset.test\msvc-10.0\debug
 \threading-multi\std_bitset.obj.rsp"

 std_bitset.cpp
 ..\libs\utility\swap\test\std_bitset.cpp(20) : error C2440: 'initializing'
 : cannot convert from 'unsigned long' to 'std::bitset<_Bits>'
         with
         [
             _Bits=8
         ]
         No constructor could take the source type, or constructor overload
 resolution was ambiguous
 ..\libs\utility\swap\test\std_bitset.cpp(21) : error C2440: 'initializing'
 : cannot convert from 'unsigned long' to 'std::bitset<_Bits>'
         with
         [
             _Bits=8
         ]
         No constructor could take the source type, or constructor overload
 resolution was ambiguous
 }}}

 This is caused by a bug, reported to Microsoft by Richard Webb:
 https://connect.microsoft.com/VisualStudio/feedback/details/532897

 /problems-constructing-a-bitset-from-an-unsigned-long-in-the-vc-rc

 Juergen Hunold tested various workarounds at msvc-10.0, msvc-9.0 and
 gcc-4.4.  See also ''[boost] [utility/swap] MSVC 10 test failure, unsigned
 long to std::bitset conversion invalid?'',
 http://lists.boost.org/Archives/boost/2010/03/162690.php

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3984>
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