id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7950	Eliminate W4-warnings under VS2005 - warning C4913: user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used	Peter Brockamp <p.brockamp@…>	viboes	"Try this code snippet:

{{{
#include <boost/circular_buffer.hpp>
#include <boost/date_time.hpp> // Including this causes the warnings

void ProvokeWarnings(void) {
  boost::circular_buffer<int> Test(100);
  Test.set_capacity(500); // This provokes the warnings
}
}}}

Compiling this with /W4 in VS2005 will give you a couple of warnings directed towards overloaded coma-operators. Overloading the coma-operator is done in several other libraries and some of them get pulled in to circular_buffer by including date_time.hpp:

{{{
\boost\circular_buffer\details.hpp(437) : warning C4913: user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used
\boost\circular_buffer\base.hpp(863) : see reference to function template instantiation 'ForwardIterator boost::cb_details::uninitialized_copy_with_alloc<boost::cb_details::iterator<Buff,Traits>,int*,std::allocator<_Ty>>(InputIterator,InputIterator,ForwardIterator,Alloc &)' being compiled
\boost\circular_buffer\base.hpp(856) : while compiling class template member function 'void boost::circular_buffer<T>::set_capacity(__w64 unsigned int)'
test.cpp(5) : see reference to class template instantiation 'boost::circular_buffer<T>' being compiled
1>        with
1>        [
1>            T=int
1>        ]

}}}

Attached a patch which silences these warnings (this is done similarly in other boost libraries fiddling with the coma-operator, circular_buffer is more or less a victim of these warnings here).

Probably it would be better to exclude these (obviously very special) overloads of operator ',' from the ADL in circular_buffer, but this will require changes to the libraries who overload the operator."	Patches	closed	Boost 1.55.0	circular_buffer	Boost 1.52.0	Cosmetic	fixed	warnings VS2005