std::tuple< T > Struct Template Reference

Description

template<typename... T>
struct std::tuple< T >

Adapter for std::tuples.

Modeled concepts

A std::tuple is a model of the Sequence concept, and all the concepts it refines. That makes it essentially the same as a Hana tuple, although the complexity of some operations might differ from that of Hana's tuple.

// 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/equal.hpp>
#include <boost/hana/ext/std/tuple.hpp>
#include <boost/hana/integral_constant.hpp>
#include <boost/hana/transform.hpp>

#include <string>
#include <tuple>
namespace hana = boost::hana;


struct Fish { std::string name; };
struct Cat  { std::string name; };
struct Dog  { std::string name; };

int main() {
    std::tuple<Fish, Cat, Dog> animals{{"Nemo"}, {"Garfield"}, {"Snoopy"}};
    hana::front(animals).name = "Moby Dick";

    auto names = hana::transform(animals, [](auto a) {
      return a.name;
    });

    BOOST_HANA_RUNTIME_CHECK(hana::equal(
        names,
        std::make_tuple("Moby Dick", "Garfield", "Snoopy")
    ));
}