diff -r 2e6e9d9f2159 -r c9d008861178 tests/util_allocator.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/util_allocator.h	Wed Feb 08 20:26:26 2023 +0100
@@ -0,0 +1,81 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. 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 HOLDER 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.
+ */
+
+#ifndef UCX_UTIL_ALLOCATOR_H
+#define UCX_UTIL_ALLOCATOR_H
+
+#include "cx/allocator.h"
+
+#include <set>
+
+struct CxTestingAllocator : public CxAllocator {
+    /**
+     * Total number of all allocations (malloc, calloc, realloc).
+     * A realloc() does only count when the memory has to be moved.
+     */
+    unsigned alloc_total = 0;
+    /**
+     * Number of failed allocations (malloc, calloc, realloc).
+     */
+    unsigned alloc_failed = 0;
+    /**
+     * Total number of freed pointers.
+     * A reallocation also counts as a free when the memory has to be moved.
+     */
+    unsigned free_total = 0;
+    /**
+     * Number of failed free invocations.
+     * A free() is considered failed, if it has not been performed on tracked memory.
+     */
+    unsigned free_failed = 0;
+    /**
+     * The set of tracked memory blocks.
+     */
+    std::set<void *> tracked;
+
+    /**
+     * Constructs a new testing allocator.
+     */
+    CxTestingAllocator();
+
+    /**
+     * Verifies that this allocator has been used.
+     *
+     * @return true if any allocation was attempted using this allocator
+     */
+    [[nodiscard]] bool used() const;
+
+    /**
+     * Verifies that all allocated memory blocks are freed and no free occurred twice.
+     *
+     * @return true iff all tracked allocations / deallocations were valid
+     */
+    [[nodiscard]] bool verify() const;
+};
+
+#endif // UCX_UTIL_ALLOCATOR_H