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50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
#include <vector>
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#include <range/v3/view/drop.hpp>
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#include <range/v3/view/view.hpp>
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#include "../simple_test.hpp"
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#include "../test_utils.hpp"
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using namespace ranges;
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struct my_drop_base_fn
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{
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template<typename Rng>
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auto operator()(Rng && rng, range_difference_t<Rng> n) const
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{
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return drop_view<views::all_t<Rng>>(views::all(static_cast<Rng &&>(rng)), n);
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}
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};
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struct my_drop_fn : my_drop_base_fn
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{
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using my_drop_base_fn::operator();
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template<typename Int>
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constexpr auto operator()(Int n) const
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{
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return make_view_closure([=](auto && rng) {
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return my_drop_base_fn{}(std::forward<decltype(rng)>(rng), n); });
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}
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};
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RANGES_INLINE_VARIABLE(my_drop_fn, my_drop)
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/// #https://github.com/ericniebler/range-v3/issues/1169
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void constexpr_test_1169()
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{
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#if RANGES_CXX_CONSTEXPR >= RANGES_CXX_CONSTEXPR_LAMBDAS
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constexpr auto const drop1 = my_drop(1);
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constexpr auto const drop3 = drop1 | my_drop(2);
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std::vector<int> vec = {1, 2, 3, 4};
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check_equal(vec | drop3, {4});
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#endif
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(void)my_drop;
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}
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int main()
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{
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constexpr_test_1169();
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return test_result();
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}
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