32 lines
992 B
C++
32 lines
992 B
C++
// Copyright Louis Dionne 2013-2017
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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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#include <boost/hana/assert.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/ext/boost/mpl/vector.hpp>
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#include <boost/hana/ext/std/integral_constant.hpp>
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#include <boost/hana/fold_left.hpp>
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#include <boost/hana/if.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/plus.hpp>
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#include <boost/hana/type.hpp>
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#include <boost/mpl/vector.hpp>
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#include <type_traits>
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namespace hana = boost::hana;
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namespace mpl = boost::mpl;
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auto types = mpl::vector<long, float, short, float, long, long double>{};
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auto number_of_floats = hana::fold_left(types, hana::int_c<0>, [](auto count, auto t) {
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return hana::if_(hana::trait<std::is_floating_point>(t),
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count + hana::int_c<1>,
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count
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);
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});
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BOOST_HANA_CONSTANT_CHECK(number_of_floats == hana::int_c<3>);
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int main() { }
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