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diff --git a/vendor/CppQuickCheck-2018-03-28/examples/src/TestSlowShrinking.cpp b/vendor/CppQuickCheck-2018-03-28/examples/src/TestSlowShrinking.cpp
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+/*
+ * Copyright (c) 2016, Philipp Classen All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "cppqc.h"
+
+#include <vector>
+#include <chrono>
+#include <thread>
+#include <atomic>
+
+// This simulates a test that is extremely slow. For such tests,
+// shrinking can become a problem, as it can take quite a while.
+struct PropTestSlowFunction: cppqc::Property<std::vector<int>>
+{
+    mutable std::atomic<bool> shrinking{false};
+
+    bool check(const std::vector<int> &v) const override
+    {
+        if (shrinking) {
+            std::cout << "Sleeping..." << std::endl;
+            std::this_thread::sleep_for(std::chrono::seconds(1));
+        }
+
+        if (v.size() >= 4 && (v[3] % 5) == 1) {
+            shrinking = true;
+            return false;
+        }
+        return true;
+    }
+    std::string name() const override
+    {
+        return "Sorting should be sorted";
+    }
+};
+
+int main()
+{
+    cppqc::quickCheckOutput(PropTestSlowFunction());
+}