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Suppress nasty GCC warnings

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[SVN r12968]
This commit is contained in:
Dave Abrahams
2002-02-28 00:22:31 +00:00
parent 1f0a9440b0
commit ecaab696b7
1 changed files with 34 additions and 10 deletions
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44
include/boost/type_traits/composite_traits.hpp
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@ -372,24 +372,48 @@ public:
* is_enum
*
**********************************************/
namespace detail{
struct int_convertible
namespace detail
{
int_convertible(int);
};
struct int_convertible
{
int_convertible(int);
};
// Don't evaluate convertibility to int_convertible unless the type
// is non-arithmetic. This suppresses warnings with GCC.
template <bool arithmetic_or_reference>
struct is_enum_helper
{
template <class T>
struct type
{
BOOST_STATIC_CONSTANT(bool, value = false);
};
};
template <>
struct is_enum_helper<false>
{
template <class T>
struct type
: ::boost::is_convertible<T,::boost::detail::int_convertible>
{
};
};
} // namespace detail
#ifndef __BORLANDC__
template <typename T> struct is_enum
{
private:
typedef typename ::boost::add_reference<T>::type r_type;
public:
BOOST_STATIC_CONSTANT(bool, value =
(::boost::type_traits::ice_and<
::boost::type_traits::ice_not< ::boost::is_arithmetic<T>::value>::value,
::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value,
::boost::is_convertible<r_type, detail::int_convertible>::value
BOOST_STATIC_CONSTANT(bool, selector =
(::boost::type_traits::ice_or<
::boost::is_arithmetic<T>::value
, ::boost::is_reference<T>::value
>::value));
typedef typename ::boost::detail::is_enum_helper<selector>::template type<r_type> helper;
public:
BOOST_STATIC_CONSTANT(bool, value = helper::value);
};
// Specializations suppress some nasty warnings with GCC