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From "Eric Lemings" <>
Subject RE: implementation of Unary Traits
Date Thu, 26 Jun 2008 23:58:58 GMT

> -----Original Message-----
> From: Martin Sebor [] On Behalf Of Martin Sebor
> Sent: Thursday, June 26, 2008 5:45 PM
> To:
> Subject: implementation of Unary Traits
> The implementation of Unary Traits (e.g., is_void) uses explicit
> specialization on all four combinations of cv-qualifiers for each
> trait (plain, const, volatile, and const volatile). I'm wondering
> if the alternative approach of stripping the qualifiers before
> "dispatching" to just one explicit specialization has been
> considered. The potential advantage of this approach is fewer
> declarations, smaller translation units, and thus (presumably)
> faster compilation.

Though I'm using a relational (binary) type trait, I'm getting warnings
because the cv-qualifiers are not being stripped.

	gcc -c -I/work/stdcxx/branches/4.3.x/include/ansi -D_RWSTDDEBUG
-pthread -I/work/stdcxx/branches/4.3.x/include
-I/work/stdcxx/branches/4.3.x/tests/include  -std=gnu++0x
-D_RWSTD_EXT_CXX_0X -W -Wall -Wcast-qual -Winline -Wshadow
-Wwrite-strings -Wno-long-long -Wcast-align
	/work/stdcxx/branches/4.3.x/include/rw/_meta_rel.h: In
instantiation of '__rw::__rw_is_convertible_impl<const int, int>':
instantiated from '__rw::__rw_is_convertible_3<const int, int, false,
instantiated from '__rw::__rw_is_convertible_2<const int, int, false>'
instantiated from '__rw::__rw_is_convertible_1<const int, int, false,
instantiated from '__rw::__rw_is_convertible<const int, int>'
	/work/stdcxx/branches/4.3.x/include/tuple:68:   instantiated
from 'std::tuple<const int>::_C_is_compatible<int>'
	/work/stdcxx/branches/4.3.x/include/tuple:123:   instantiated
from 'std::tuple<_Types>::tuple(_TypesU&& ...) [with _TypesU = int,
_TypesT = const int]'
instantiated from here
	/work/stdcxx/branches/4.3.x/include/rw/_meta_rel.h:77: warning:
type qualifiers ignored on function return type


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