diff options
Diffstat (limited to 'src/boost/libs/hana/example/at_key.cpp')
-rw-r--r-- | src/boost/libs/hana/example/at_key.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/at_key.cpp b/src/boost/libs/hana/example/at_key.cpp new file mode 100644 index 000000000..41f29b573 --- /dev/null +++ b/src/boost/libs/hana/example/at_key.cpp @@ -0,0 +1,27 @@ +// 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/at_key.hpp> +#include <boost/hana/integral_constant.hpp> +#include <boost/hana/map.hpp> +#include <boost/hana/pair.hpp> +#include <boost/hana/type.hpp> + +#include <string> +namespace hana = boost::hana; + + +int main() { + auto m = hana::make_map( + hana::make_pair(hana::type<int>{}, std::string{"int"}), + hana::make_pair(hana::int_<3>{}, std::string{"3"}) + ); + + BOOST_HANA_RUNTIME_CHECK(hana::at_key(m, hana::type<int>{}) == "int"); + + // usage as operator[] + BOOST_HANA_RUNTIME_CHECK(m[hana::type<int>{}] == "int"); + BOOST_HANA_RUNTIME_CHECK(m[hana::int_<3>{}] == "3"); +} |