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Diffstat (limited to '')
-rw-r--r-- | src/boost/libs/hana/example/accessors.cpp | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/accessors.cpp b/src/boost/libs/hana/example/accessors.cpp new file mode 100644 index 000000000..cbc489019 --- /dev/null +++ b/src/boost/libs/hana/example/accessors.cpp @@ -0,0 +1,42 @@ +// 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/accessors.hpp> +#include <boost/hana/assert.hpp> +#include <boost/hana/at.hpp> +#include <boost/hana/define_struct.hpp> +#include <boost/hana/equal.hpp> +#include <boost/hana/first.hpp> +#include <boost/hana/integral_constant.hpp> +#include <boost/hana/second.hpp> +#include <boost/hana/string.hpp> + +#include <string> +namespace hana = boost::hana; + + +struct Person { + BOOST_HANA_DEFINE_STRUCT(Person, + (std::string, name), + (unsigned short, age) + ); +}; + +int main() { + constexpr auto accessors = hana::accessors<Person>(); + BOOST_HANA_CONSTANT_CHECK( + hana::first(accessors[hana::size_c<0>]) == BOOST_HANA_STRING("name") + ); + + BOOST_HANA_CONSTANT_CHECK( + hana::first(accessors[hana::size_c<1>]) == BOOST_HANA_STRING("age") + ); + + constexpr auto get_name = hana::second(accessors[hana::size_c<0>]); + constexpr auto get_age = hana::second(accessors[hana::size_c<1>]); + + Person john{"John", 30}; + BOOST_HANA_RUNTIME_CHECK(get_name(john) == "John"); + BOOST_HANA_RUNTIME_CHECK(get_age(john) == 30); +} |