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is_sequence fix for MSVC 6.5/7.0

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[SVN r18785]
This commit is contained in:
Aleksey Gurtovoy
2003-06-12 10:17:31 +00:00
parent 85c3973c33
commit daf876a550
1 changed files with 7 additions and 2 deletions
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9
include/boost/mpl/is_sequence.hpp
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@@ -18,7 +18,7 @@
#define BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED #define BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED
#include "boost/mpl/not.hpp" #include "boost/mpl/not.hpp"
#include "boost/mpl/or.hpp" #include "boost/mpl/and.hpp"
#include "boost/mpl/begin_end.hpp" #include "boost/mpl/begin_end.hpp"
#include "boost/mpl/if.hpp" #include "boost/mpl/if.hpp"
#include "boost/mpl/bool.hpp" #include "boost/mpl/bool.hpp"
@@ -41,8 +41,13 @@ namespace boost { namespace mpl {
namespace aux { namespace aux {
// agurt, 11/jun/03:
// MSVC 6.5/7.0 fails if 'has_begin' is instantiated on a class type that has a
// 'begin' member that doesn't name a type; e.g. 'has_begin< std::vector<int> >'
// would fail; requiring 'T' to have _both_ 'tag' and 'begin' members workarounds
// the issue for most real-world cases
template< typename T > struct is_sequence_impl template< typename T > struct is_sequence_impl
: or_< : and_<
identity< aux::has_tag<T> > identity< aux::has_tag<T> >
, identity< aux::has_begin<T> > , identity< aux::has_begin<T> >
> >