Class Allocator

include/rabitqlib/utils/memory.hpp:55–75

    void deallocate(T* ptr, [[maybe_unused]] std::size_t n) { std::free(ptr); }
};

template <typename T>
struct Allocator {
   public:
    using value_type = T;

    constexpr Allocator() noexcept = default;

    template <typename U>
    explicit constexpr Allocator(const Allocator<U>&) noexcept {}

    [[nodiscard]] constexpr T* allocate(std::size_t n) { return ::new T[n]; }

    constexpr void deallocate(T* ptr, [[maybe_unused]] size_t n) noexcept {
        ::delete[] ptr;
    }

    // Intercept zero-argument construction to do default initialization.
    template <typename U>
    void construct(U* ptr) noexcept(std::is_nothrow_default_constructible_v<U>) {
        ::new (static_cast<void*>(ptr)) U;
    }
};