id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
10818	"A C4267 ""possible loss of data"" warning when compiling on VS2013 x64 with /W4"	kaa123@…	jsiek	"Example:
  boost::dynamic_bitset<> flags;
...
  bool b = flags[56];
Warning when calling the reference class constructor from the [] operator.

Compiler -- VS2013, Platform -- x64, Debug mode, Warning level -- /W4.

Fix:  I found if you changed the pos parameter of the reference class constructor to size_type, the warning went away.

From:
  reference(block_type & b, block_type pos)
To:
  reference(block_type & b, size_type pos)
Location Line 88 of dynamic_bitset.hpp


Actual error message:

4>C:\Boost\1_56_0-VS_2013-x64\include\boost-1_56\boost/dynamic_bitset/dynamic_bitset.hpp(296): warning C4267: 'argument' : conversion from 'size_t' to 'unsigned long', possible loss of data
4>          C:\Boost\1_56_0-VS_2013-x64\include\boost-1_56\boost/dynamic_bitset/dynamic_bitset.hpp(295) : while compiling class template member function 'boost::dynamic_bitset<unsigned long,std::allocator<Block>>::reference boost::dynamic_bitset<Block,std::allocator<Block>>::operator [](boost::dynamic_bitset<Block,std::allocator<Block>>::size_type)'


reference(block_type & b, size_type pos)"	Bugs	new	To Be Determined	dynamic_bitset	Boost 1.56.0	Cosmetic