56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/at_key.hpp>
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#include <boost/hana/define_struct.hpp>
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#include <boost/hana/string.hpp>
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#include <string>
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namespace hana = boost::hana;
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struct Person {
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BOOST_HANA_DEFINE_STRUCT(Person,
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(std::string, name),
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(std::string, last_name),
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(int, age)
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);
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};
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int main() {
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// non-const ref
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{
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Person john{"John", "Doe", 30};
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std::string& name = hana::at_key(john, BOOST_HANA_STRING("name"));
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std::string& last_name = hana::at_key(john, BOOST_HANA_STRING("last_name"));
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int& age = hana::at_key(john, BOOST_HANA_STRING("age"));
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name = "Bob";
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last_name = "Foo";
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age = 99;
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BOOST_HANA_RUNTIME_CHECK(john.name == "Bob");
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BOOST_HANA_RUNTIME_CHECK(john.last_name == "Foo");
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BOOST_HANA_RUNTIME_CHECK(john.age == 99);
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}
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// const ref
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{
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Person john{"John", "Doe", 30};
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Person const& const_john = john;
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std::string const& name = hana::at_key(const_john, BOOST_HANA_STRING("name"));
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std::string const& last_name = hana::at_key(const_john, BOOST_HANA_STRING("last_name"));
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int const& age = hana::at_key(const_john, BOOST_HANA_STRING("age"));
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john.name = "Bob";
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john.last_name = "Foo";
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john.age = 99;
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BOOST_HANA_RUNTIME_CHECK(name == "Bob");
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BOOST_HANA_RUNTIME_CHECK(last_name == "Foo");
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BOOST_HANA_RUNTIME_CHECK(age == 99);
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}
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}
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