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35cdf3b83a
This is done because the resulting macros are much more straightforward to debug when a user makes a mistake. Also, it avoids pulling yet another dependency. Also added some general purpose macros in detail/preprocessor.hpp.
90 lines
1.7 KiB
C++
90 lines
1.7 KiB
C++
/*
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@copyright Louis Dionne 2015
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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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*/
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#include <boost/hana.hpp>
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#include <iostream>
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#include <string>
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using namespace boost::hana::literals;
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using namespace boost::hana;
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using namespace std::literals;
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//! [BOOST_HANA_DEFINE_STRUCT]
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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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(int, age)
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);
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};
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//! [BOOST_HANA_DEFINE_STRUCT]
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int main() {
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//! [for_each]
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Person john{"John", 30};
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for_each(john, [](auto pair) {
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std::cout << to<char const*>(first(pair)) << ": " << second(pair) << std::endl;
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});
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// name: John
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// age: 30
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//! [for_each]
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//! [for_each.fuse]
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for_each(john, fuse([](auto name, auto member) {
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std::cout << to<char const*>(name) << ": " << member << std::endl;
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}));
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//! [for_each.fuse]
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#ifdef BOOST_HANA_CONFIG_ENABLE_STRING_UDL
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{
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//! [at_key]
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std::string name = at_key(john, "name"_s);
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BOOST_HANA_RUNTIME_CHECK(name == "John");
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int age = at_key(john, "age"_s);
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BOOST_HANA_RUNTIME_CHECK(age == 30);
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//! [at_key]
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}{
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//! [to<Map>]
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auto map = insert(to<Map>(john), make_pair("last name"_s, "Doe"s));
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std::string name = map["name"_s];
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BOOST_HANA_RUNTIME_CHECK(name == "John");
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std::string last_name = map["last name"_s];
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BOOST_HANA_RUNTIME_CHECK(last_name == "Doe");
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int age = map["age"_s];
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BOOST_HANA_RUNTIME_CHECK(age == 30);
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//! [to<Map>]
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}
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#endif
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}
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//! [BOOST_HANA_ADAPT_STRUCT]
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namespace not_my_namespace {
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struct Person {
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std::string name;
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int age;
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};
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}
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BOOST_HANA_ADAPT_STRUCT(not_my_namespace::Person,
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(std::string, name),
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(int, age)
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);
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//! [BOOST_HANA_ADAPT_STRUCT]
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