There's a regression failure of Microsoft Visual C++ 10 on a unit test of the boost::swap utility:
..\libs\utility\swap\test\std_bitset.cpp(20) : error C2440: 'initializing' : cannot convert from 'unsigned long' to 'std::bitset<_Bits>' No constructor could take the source type, or constructor overload resolution was ambiguous
..\libs\utility\swap\test\std_bitset.cpp(21) : error C2440
See http://www.boost.org/development/tests/trunk/developer/output/RWVC10-boost-b... Do I understand correctly that MSVC 10 does not support implicit conversion from unsigned long to std::bitset<N>? The program "std_bitset.cpp" is at http://svn.boost.org/svn/boost/trunk/libs/utility/swap/test/std_bitset.cpp It does: #include <bitset> int test_main(int, char*[]) { typedef std::bitset<8> bitset_type; const bitset_type initial_value1 = 1ul; // Line 20. const bitset_type initial_value2 = 2ul; // Line 21. // [...] return 0; } Can anyone here reproduce the compile error? If so, would it be helpful to replace line 20 and 21 by using parentheses? As follows: const bitset_type initial_value1(1ul); const bitset_type initial_value2(2ul); Kind regards, Niels -- Niels Dekker http://www.xs4all.nl/~nd/dekkerware Scientific programmer at LKEB, Leiden University Medical Center