Boost.Hana: boost::fusion::tuple< T > Struct Template Reference

| Boost.Hana 1.7.1 Your standard library for metaprogramming |

boost::fusion::tuple< T > Struct Template Reference
External adapters » Boost.Fusion adapters

## Description

### template<typename ... T>
struct boost::fusion::tuple< T >

Adapter for Boost.Fusion tuples.

## Modeled concepts

A Fusion 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 a 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/boost/fusion/tuple.hpp>
#include <boost/hana/integral_constant.hpp>
#include <boost/hana/transform.hpp>
#include <boost/fusion/include/make_tuple.hpp>
#include <boost/fusion/include/tuple.hpp>
#include <string>
namespace fusion = boost::fusion;
namespace hana = boost::hana;
struct Fish { std::string name; };
struct Cat { std::string name; };
struct Dog { std::string name; };
int main() {
fusion::tuple<Fish, Cat, Dog> animals{Fish{"Nemo"}, Cat{"Garfield"}, Dog{"Snoopy"}};
hana::front(animals).name = "Moby Dick";
auto names = hana::transform(animals, [](auto a) {
return a.name;
});
BOOST_HANA_RUNTIME_CHECK(hana::equal(
names,
fusion::make_tuple("Moby Dick", "Garfield", "Snoopy")
));
}
assert.hpp
Defines macros to perform different kinds of assertions.
equal.hpp
Defines boost::hana::equal.
tuple.hpp
Adapts boost::fusion::tuple for use with Hana.
boost::hana::equal
constexpr auto equal
Returns a Logical representing whether x is equal to y.
Definition: equal.hpp:64
boost::hana::front
constexpr auto front
Returns the first element of a non-empty iterable.
Definition: front.hpp:32
BOOST_HANA_RUNTIME_CHECK
#define BOOST_HANA_RUNTIME_CHECK(...)
Equivalent to BOOST_HANA_RUNTIME_ASSERT, but not influenced by the BOOST_HANA_CONFIG_DISABLE_ASSERTIO...
Definition: assert.hpp:209
integral_constant.hpp
Defines boost::hana::integral_constant.
boost::hana
Namespace containing everything in the library.
Definition: accessors.hpp:20
transform.hpp
Defines boost::hana::transform.