test/util_allocator.h

/*
 * 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.
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 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
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 *
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#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 */