libcruft-util/test/pool.cpp

#include "../pool.hpp"

#include "../tap.hpp"

#include <set>
#include <vector>
#include <algorithm>


//-----------------------------------------------------------------------------
void
check_single (cruft::TAP::logger &tap)
{
    // Ensure a single element doesn't break the circular linked list
    cruft::pool<uint64_t> single(1);
    tap.expect_nothrow ([&] {
        single.deallocate (single.allocate ());
    }, "single element acquire-release");
}


//-----------------------------------------------------------------------------
void
check_unique_ptr (cruft::TAP::logger &tap)
{
    constexpr std::size_t element_count = 1025;
    cruft::pool<uint64_t> uintpool (element_count);
    std::set<uint64_t *> uintset;

    // Take all pointers out, checking they are unique, then replace for destruction.
    while (!uintpool.full ())
        uintset.insert (uintpool.allocate ());

    tap.expect_eq (uintset.size (), uintpool.capacity (), "extracted maximum elements");

    for (auto i: uintset)
        uintpool.deallocate (i);

    tap.expect_eq (uintpool.size (), 0u, "re-inserted maximum elements");
    uintset.clear ();

    // Do the above one more time to ensure that releasing works right
    while (!uintpool.full ())
        uintset.insert (uintpool.allocate ());
    tap.expect_eq (uintset.size (), uintpool.capacity (), "re-extracted maximum elements");
}


//-----------------------------------------------------------------------------
void
check_keep_value (cruft::TAP::logger &tap)
{
    // Ensure that items keep their values.
    cruft::pool<std::size_t> uintpool(256);
    std::vector<std::size_t*> uintvector;
    uintvector.reserve(uintpool.capacity ());

    // Give every item a unique value
    for (std::size_t i = 0; i < uintpool.capacity (); ++i) {
        std::size_t *item = uintpool.allocate ();
        *item = i;

        uintvector.push_back(item);
    }

    CHECK_EQ (uintvector.size (), uintpool.capacity ());

    // Ensure they're all still present
    std::vector<bool> present(uintpool.capacity (), false);
    for (auto i = uintvector.begin (); i != uintvector.end (); ++i) {
        CHECK (**i < uintpool.capacity ());
        CHECK (present[**i] != true);

        present[**i] = true;
    }

    // All must have been marked as present...
    tap.expect (std::find (present.begin (), present.end (), false) == present.end (), "values retained");

    // Release all back into the pool for destruction
    //for (auto i = uintvector.begin (); i != uintvector.end (); ++i)
    //    uintpool.release (*i);
    //uintvector.clear ();
}


//-----------------------------------------------------------------------------
void
check_keep_variadic_value (cruft::TAP::logger &tap)
{
    struct foo_t {
        foo_t (uint64_t _a, uint64_t _b, uint64_t _c, uint64_t _d):
            a (_a),
            b (_b),
            c (_c),
            d (_d)
        { ; }

        uint64_t a, b, c, d;
    };

    cruft::pool<foo_t> alloc (512);

    bool success = true;

    for (uint64_t a = 0; a < 8; ++a)
        for (uint64_t b = 0; b < 8; ++b)
            for (uint64_t c = 0; c < 8; ++c) {
                uint64_t d = (a << 24) | (b << 16) | (c << 8);
                auto ptr = alloc.construct (a, b, c, d);

                if (ptr->a != a || ptr->b != b || ptr->c != c || ptr->d != d) {
                    success = false;
                    goto done;
                }
            }

done:
    tap.expect (success, "variadiac construction retains values");
}


//-----------------------------------------------------------------------------
void
check_size_queries (cruft::TAP::logger &tap)
{
    cruft::pool<int> data (8);

    tap.expect_eq (data.size (), 0u, "initial size is zero");
    tap.expect (data.empty (),  "initial object is empty");

    auto first = data.allocate ();
    tap.expect_eq (data.size (), 1u, "1 allocation has size of 1");
    tap.expect (!data.empty (), "1 allocation is not empty");

    data.deallocate (first);
    tap.expect (data.empty (), "full deallocation is empty");
}


//-----------------------------------------------------------------------------
int
main (int, char **)
{
    return cruft::TAP::logger::run ([] (auto &tap) {
        check_single (tap);
        check_unique_ptr (tap);
        check_keep_value (tap);
        check_keep_variadic_value (tap);
        check_size_queries (tap);
    });
}