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Diffstat (limited to 'src/boost/libs/hana/example/iterable/searchable.cpp')
-rw-r--r-- | src/boost/libs/hana/example/iterable/searchable.cpp | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/iterable/searchable.cpp b/src/boost/libs/hana/example/iterable/searchable.cpp new file mode 100644 index 000000000..a685361cf --- /dev/null +++ b/src/boost/libs/hana/example/iterable/searchable.cpp @@ -0,0 +1,47 @@ +// Copyright Louis Dionne 2013-2017 +// Distributed under the Boost Software License, Version 1.0. +// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) + +#include <boost/hana/assert.hpp> +#include <boost/hana/ext/std/integral_constant.hpp> +#include <boost/hana/find.hpp> +#include <boost/hana/find_if.hpp> +#include <boost/hana/functional/compose.hpp> +#include <boost/hana/integral_constant.hpp> +#include <boost/hana/optional.hpp> +#include <boost/hana/tuple.hpp> +#include <boost/hana/type.hpp> + +#include <type_traits> +namespace hana = boost::hana; + + +// First get the type of the object, and then call the trait on it. +constexpr auto is_integral = hana::compose(hana::trait<std::is_integral>, hana::typeid_); +constexpr auto is_class = hana::compose(hana::trait<std::is_class>, hana::typeid_); + +static_assert( + hana::find_if(hana::make_tuple(1.0, 2, '3'), is_integral) + == + hana::just(2) +, ""); + +BOOST_HANA_CONSTANT_CHECK( + hana::find_if(hana::make_tuple(1.0, 2, '3'), is_class) + == + hana::nothing +); + +BOOST_HANA_CONSTANT_CHECK( + hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<void>) + == + hana::just(hana::type_c<void>) +); + +BOOST_HANA_CONSTANT_CHECK( + hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<int>) + == + hana::nothing +); + +int main() { } |