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Telegram/ThirdParty/range-v3/test/action/take_while.cpp

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+// Range v3 library
+//
+//  Copyright Eric Niebler 2014-present
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+
+#include <vector>
+#include <range/v3/core.hpp>
+#include <range/v3/view/iota.hpp>
+#include <range/v3/algorithm/move.hpp>
+#include <range/v3/action/take_while.hpp>
+#include "../simple_test.hpp"
+#include "../test_utils.hpp"
+
+int main()
+{
+    using namespace ranges;
+    using namespace std::placeholders;
+
+    auto v = views::ints(1,21) | to<std::vector>();
+    auto & v2 = actions::take_while(v, std::bind(std::less<int>(), _1, 18));
+    CHECK(&v2 == &v);
+    CHECK(v.size() == 17u);
+    CHECK(v.back() == 17);
+
+    v = std::move(v) | actions::take_while([](int i){return i < 15;});
+    CHECK(v.size() == 14u);
+    CHECK(v.back() == 14);
+
+    v |= actions::take_while([](int i){return i < 12;});
+    CHECK(v.size() == 11u);
+    CHECK(v.back() == 11);
+
+    v |= actions::take_while([](int){return true;});
+    CHECK(v.size() == 11u);
+
+    v |= actions::take_while([](int){return false;});
+    CHECK(v.size() == 0u);
+
+    return ::test_result();
+}