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Diffstat (limited to 'boost/metaparse/v1/cpp11/first_of.hpp')
-rw-r--r-- | boost/metaparse/v1/cpp11/first_of.hpp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/boost/metaparse/v1/cpp11/first_of.hpp b/boost/metaparse/v1/cpp11/first_of.hpp new file mode 100644 index 0000000000..a0ad7f4acd --- /dev/null +++ b/boost/metaparse/v1/cpp11/first_of.hpp @@ -0,0 +1,36 @@ +#ifndef BOOST_METAPARSE_V1_CPP11_FIRST_OF_HPP +#define BOOST_METAPARSE_V1_CPP11_FIRST_OF_HPP + +// Copyright Abel Sinkovics (abel@sinkovics.hu) 2017. +// 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) + +#include <boost/metaparse/v1/cpp11/impl/nth_of_c.hpp> + +#include <boost/metaparse/v1/fail.hpp> +#include <boost/metaparse/v1/error/index_out_of_range.hpp> + +namespace boost +{ + namespace metaparse + { + namespace v1 + { + template <class... Ps> + struct first_of + { + typedef first_of type; + + template <class S, class Pos> + struct apply : impl::nth_of_c<0, S, Pos, Ps...> {}; + }; + + template <> + struct first_of<> : fail<error::index_out_of_range<0, -1, 0>> {}; + } + } +} + +#endif + |