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Diffstat (limited to 'boost/type_erasure/is_empty.hpp')
-rw-r--r-- | boost/type_erasure/is_empty.hpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/boost/type_erasure/is_empty.hpp b/boost/type_erasure/is_empty.hpp new file mode 100644 index 0000000000..3a6c004d61 --- /dev/null +++ b/boost/type_erasure/is_empty.hpp @@ -0,0 +1,28 @@ +// Boost.TypeErasure library +// +// Copyright 2012 Steven Watanabe +// +// Distributed under the Boost Software License Version 1.0. (See +// accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt) +// +// $Id$ + +#ifndef BOOST_TYPE_ERASURE_IS_EMPTY_HPP_INCLUDED +#define BOOST_TYPE_ERASURE_IS_EMPTY_HPP_INCLUDED + +#include <boost/type_erasure/detail/access.hpp> + +namespace boost { +namespace type_erasure { + +/** Returns true for an empty @ref any. */ +template<class T> +bool is_empty(const T& arg) { + return ::boost::type_erasure::detail::access::data(arg).data == 0; +} + +} +} + +#endif |