std::integral_constant< T, v > Struct Template Reference

Description

template<typename T, T v>
struct std::integral_constant< T, v >

Adapter for std::integral_constants.

Provided models

1. Constant and IntegralConstant
   A std::integral_constant is a model of the IntegralConstant and Constant concepts, just like hana::integral_constants are. As a consequence, they are also implicitly a model of the concepts provided for all models of Constant.

   // 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/integral_constant.hpp>
   #include <boost/hana/integral_constant.hpp>
   #include <boost/hana/not_equal.hpp>
   
   #include <type_traits>
   namespace hana = boost::hana;
   
   
   static_assert(hana::value(std::integral_constant<int, 3>{}) == 3, "");
   static_assert(std::integral_constant<int, 3>::value == 3, "");
   
   BOOST_HANA_CONSTANT_CHECK(hana::equal(std::integral_constant<int, 3>{}, hana::int_c<3>));
   BOOST_HANA_CONSTANT_CHECK(hana::equal(std::integral_constant<int, 3>{}, hana::long_c<3>));
   BOOST_HANA_CONSTANT_CHECK(hana::not_equal(std::integral_constant<int, 3>{}, hana::int_c<0>));
   
   int main() { }