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Editing: is_placeholder.hpp
// Boost.TypeErasure library // // Copyright 2011 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_DETAIL_IS_PLACEHOLDER_HPP_INCLUDED #define BOOST_TYPE_ERASURE_DETAIL_IS_PLACEHOLDER_HPP_INCLUDED #include <boost/mpl/bool.hpp> namespace boost { namespace type_erasure { #ifdef BOOST_TYPE_ERASURE_DOXYGEN /** A metafunction that indicates whether a type is a @ref placeholder. */ template<class T> struct is_placeholder {}; #else template<class T, class Enable = void> struct is_placeholder : ::boost::mpl::false_ {}; template<class T> struct is_placeholder<T, typename T::_boost_type_erasure_is_placeholder> : ::boost::mpl::true_ {}; #endif } } #endif
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