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Telegram/ThirdParty/range-v3/test/view/sample.cpp

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+#include <range/v3/view/sample.hpp>
+#include <range/v3/algorithm/equal.hpp>
+#include <numeric>
+#include <vector>
+#include <random>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+
+using namespace ranges;
+
+int main ()
+{
+    std::mt19937 engine;
+
+    std::vector<int> pop(100);
+    std::iota(std::begin(pop), std::end(pop), 0);
+    {
+        constexpr int N = 32;
+        std::array<int, N> tmp;
+        auto rng = pop | views::sample(N, engine);
+        using Rng = decltype(rng);
+        CPP_assert(input_range<Rng> && view_<Rng>);
+        CPP_assert(!forward_range<Rng>);
+        ranges::copy(rng, tmp.begin());
+        rng = pop | views::sample(N, engine);
+        CHECK(!ranges::equal(rng, tmp));
+        engine = decltype(engine){};
+        rng = pop | views::sample(N, engine);
+        CHECK(ranges::equal(rng, tmp));
+    }
+
+    {
+        int const some_ints[] = {0,1,2,3,4,5,6,7,8};
+        auto rng = debug_input_view<int const>{some_ints} | views::sample(4, engine);
+        using Rng = decltype(rng);
+        CPP_assert(input_range<Rng> && view_<Rng>);
+        CPP_assert(!forward_range<Rng>);
+        CHECK(ranges::distance(rng) == 4);
+    }
+
+    return ::test_result();
+}