std::pair< First, Second > Struct Template Reference
External adapters » Standard library adapters

## Description

### template<typename First, typename Second>
struct std::pair< First, Second >

Adaptation of `std::pair` for Hana.

## Modeled concepts

A `std::pair` models exactly the same concepts as a `hana::pair`. Please refer to the documentation of `hana::pair` for details.

// 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/ext/std/pair.hpp>
#include <boost/hana/first.hpp>
#include <boost/hana/less.hpp>
#include <boost/hana/not_equal.hpp>
#include <boost/hana/second.hpp>
namespace hana = boost::hana;
constexpr auto pair = std::make_pair(1, 'x');
static_assert(hana::first(pair) == 1, "");
static_assert(hana::second(pair) == 'x', "");
static_assert(hana::not_equal(pair, std::make_pair(3, 'z')), "");
static_assert(hana::less(pair, std::make_pair(3, 'x')), "");
int main() { }