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Committed experimental version that doesn't pass UDT's through (...)

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[SVN r16030]
This commit is contained in:
John Maddock
2002-10-31 12:32:52 +00:00
parent 38f7de18d8
commit dbe91fcc3a
1 changed files with 13 additions and 6 deletions
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19
include/boost/type_traits/is_convertible.hpp
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@@ -78,7 +78,7 @@ struct is_convertible_impl
{
};
#elif defined(__BORLANDC__)
#elif defined(__BORLANDC__) && (__BORLANDC__ < 0x560)
//
// special version for Borland compilers
// this version breaks when used for some
@@ -102,8 +102,9 @@ struct is_convertible_impl
#pragma option pop
};
#elif defined(__GNUC__)
// special version for gcc compiler
#elif defined(__GNUC__) || defined(__BORLANDC__)
// special version for gcc compiler + recent Borland versions
// note that this does not pass UDT's through (...)
struct any_conversion
{
@@ -127,15 +128,21 @@ struct is_convertible_impl
#else
struct any_conversion
{
template <typename T> any_conversion(const T&);
template <typename T> any_conversion(T&);
};
template <typename From, typename To>
struct is_convertible_impl
{
static ::boost::type_traits::no_type BOOST_TT_DECL _m_check(...);
static ::boost::type_traits::yes_type BOOST_TT_DECL _m_check(To);
static ::boost::type_traits::no_type BOOST_TT_DECL _m_check(any_conversion ...);
static ::boost::type_traits::yes_type BOOST_TT_DECL _m_check(To, int);
static From _m_from;
BOOST_STATIC_CONSTANT(bool, value =
sizeof( _m_check(_m_from) ) == sizeof(::boost::type_traits::yes_type)
sizeof( _m_check(_m_from, 0) ) == sizeof(::boost::type_traits::yes_type)
);
};