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hana/example/searchable/none.cpp

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967 B
C++

/*
@copyright Louis Dionne 2014
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/detail/assert.hpp>
#include <boost/hana/detail/constexpr.hpp>
#include <boost/hana/ext/std/integral_constant.hpp>
#include <boost/hana/integral.hpp>
#include <boost/hana/list/instance.hpp>
#include <boost/hana/type.hpp>
#include <type_traits>
using namespace boost::hana;
using namespace literals;
int main() {
//! [main]
BOOST_HANA_CONSTEXPR_LAMBDA auto odd = [](auto x) {
return x % 2_c != 0_c;
};
BOOST_HANA_CONSTANT_ASSERT(none(list(2_c, 4_c), odd));
BOOST_HANA_CONSTEXPR_ASSERT(!none(list(1, 2), odd));
BOOST_HANA_CONSTANT_ASSERT(
!none(list(type<void>, type<char&>), trait<std::is_void>)
);
BOOST_HANA_CONSTANT_ASSERT(
none(list(type<void>, type<char&>), trait<std::is_integral>)
);
//! [main]
}