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- // Copyright Louis Dionne 2013-2017
- // Copyright Jason Rice 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/index_if.hpp>
- #include <boost/hana/integral_constant.hpp>
- #include <cstddef>
- #include <support/counter.hpp>
- namespace hana = boost::hana;
- int main() {
- // Tests hana::index_if on an infinite iterable
- constexpr Counter<> c{};
- auto pred = [](auto i) {
- return [=](auto x) {
- return hana::bool_c<decltype(x)::value == decltype(i)::value>;
- };
- };
- static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<0>)).value()){}) == 0, "");
- static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<1>)).value()){}) == 1, "");
- static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<2>)).value()){}) == 2, "");
- static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<3>)).value()){}) == 3, "");
- static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<4>)).value()){}) == 4, "");
- static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<5>)).value()){}) == 5, "");
- static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<6>)).value()){}) == 6, "");
- }
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