id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
1095	GCC warnings with -Wsign-promo	Joaquín M López Muñoz	Daniel James	"The mere inclusion of <boost/functional/hash.hpp> produces warnings
in GCC for Boost 1.34 when -Wsign-promo is set:

In file included from /.../boost/functional/hash.hpp:10,
 from ...
/.../boost/functional/hash/hash.hpp: In member function
 `size_t boost::hash<bool>::operator()(bool) const':
/.../boost/functional/hash/hash.hpp:353: warning: passing
 `bool' chooses `int' over `long unsigned int'
[...]

In Boost 1.33.1, the warnings only appear when hash<bool>,
hash<ungisned char>, hash<wchar_t> or hash<short unsigned int>
are instantiated --the difference between that 1.33.1 and
1.34 is that the latter automatically instantiates a number
of specialization for integral types, among them the offending
ones.

Although the warnings seem unharmful, it'd be great if they can
be silenced by providing overloads of hash_value for all C++ 
integral types, so that no integral promotions occur."	Bugs	closed	Boost 1.35.0	hash	Boost 1.34.0	Cosmetic	fixed