diff options
Diffstat (limited to 'src/boost/libs/hana/example/count_if.cpp')
-rw-r--r-- | src/boost/libs/hana/example/count_if.cpp | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/count_if.cpp b/src/boost/libs/hana/example/count_if.cpp new file mode 100644 index 000000000..da7a42eba --- /dev/null +++ b/src/boost/libs/hana/example/count_if.cpp @@ -0,0 +1,32 @@ +// 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/count_if.hpp> +#include <boost/hana/equal.hpp> +#include <boost/hana/ext/std/integral_constant.hpp> +#include <boost/hana/integral_constant.hpp> +#include <boost/hana/mod.hpp> +#include <boost/hana/not_equal.hpp> +#include <boost/hana/tuple.hpp> +#include <boost/hana/type.hpp> + +#include <type_traits> +namespace hana = boost::hana; +using namespace hana::literals; + + +auto is_odd = [](auto x) { + return x % 2_c != 0_c; +}; + +int main() { + constexpr auto ints = hana::tuple_c<int, 1, 2, 3>; + BOOST_HANA_CONSTANT_CHECK(hana::count_if(ints, is_odd) == hana::size_c<2>); + + constexpr auto types = hana::tuple_t<int, char, long, short, char, double>; + BOOST_HANA_CONSTANT_CHECK(hana::count_if(types, hana::trait<std::is_floating_point>) == hana::size_c<1>); + BOOST_HANA_CONSTANT_CHECK(hana::count_if(types, hana::equal.to(hana::type_c<char>)) == hana::size_c<2>); + BOOST_HANA_CONSTANT_CHECK(hana::count_if(types, hana::equal.to(hana::type_c<void>)) == hana::size_c<0>); +} |