Method reset

common/unordered_inline_set.h:45–63

public:
    SparseArray(size_t capacity) { reset(capacity); }
    void* reset(size_t new_capacity) {
        if (_size > 0)
            for (auto x: *this) ((T&)x).~T();
        if (new_capacity == _capacity)
            return buf();
        auto s = get_s(new_capacity) * sizeof(T);
        if (new_capacity > 0) {
            auto ptr = realloc(buf(), s + new_capacity * sizeof(T));
            memset(ptr, 0, s);
            _ptr = (T*)((char*)ptr + s);
            _capacity = new_capacity;
            _size = 0;
            return ptr;
        } else {
            free(buf());
            _capacity = _size = 0;
            return _ptr = nullptr;
        }
    }
    SparseArray(SparseArray&& rhs) { *this = std::move(rhs); }
    void operator=(SparseArray&& rhs) {
        reset(0);