Class TestItem

tests/misc/containers.cpp:256–286

// ============================================================================

struct TestItem {
    int value;
    int move_count = 0;
    int copy_count = 0;

    TestItem() : value(0) {}
    explicit TestItem(int v) : value(v) {}

    // Move constructor - tracks moves
    TestItem(TestItem&& other) noexcept
        : value(other.value), move_count(other.move_count + 1) {
        other.move_count++;
    }

    // Move assignment
    TestItem& operator=(TestItem&& other) noexcept {
        value = other.value;
        move_count = other.move_count + 1;
        other.move_count++;
        return *this;
    }

    // Delete copy constructor - prevents accidental copies
    TestItem(const TestItem&) = delete;
    TestItem& operator=(const TestItem&) = delete;

    // Equality for checking values
    bool operator==(const TestItem& other) const {
        return value == other.value;
    }
};

// ============================================================================
// COMPONENT 3: TEMPLATED VALIDATORS