| 1 | // Copyright Louis Dionne 2013-2022 |
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| 2 | // Copyright Jason Rice 2017 |
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| 3 | // Distributed under the Boost Software License, Version 1.0. |
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| 4 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | #include <boost/hana/index_if.hpp> |
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| 7 | #include <boost/hana/integral_constant.hpp> |
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| 8 | |
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| 9 | #include <cstddef> |
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| 10 | #include <support/counter.hpp> |
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| 11 | |
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| 12 | namespace hana = boost::hana; |
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| 13 | |
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| 14 | |
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| 15 | int main() { |
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| 16 | // Tests hana::index_if on an infinite iterable |
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| 17 | constexpr Counter<> c{}; |
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| 18 | auto pred = [](auto i) { |
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| 19 | return [=](auto x) { |
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| 20 | return hana::bool_c<decltype(x)::value == decltype(i)::value>; |
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| 21 | }; |
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| 22 | }; |
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| 23 | |
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| 24 | static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<0>)).value()){}) == 0, "" ); |
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| 25 | static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<1>)).value()){}) == 1, "" ); |
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| 26 | static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<2>)).value()){}) == 2, "" ); |
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| 27 | static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<3>)).value()){}) == 3, "" ); |
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| 28 | static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<4>)).value()){}) == 4, "" ); |
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| 29 | static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<5>)).value()){}) == 5, "" ); |
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| 30 | static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<6>)).value()){}) == 6, "" ); |
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| 31 | } |
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| 32 | |
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