tinyobjloader/experimental/lfpAlloc/Pool.hpp

#ifndef LF_POOL_ALLOC_POOL
#define LF_POOL_ALLOC_POOL

#include <lfpAlloc/Utils.hpp>
#include <lfpAlloc/ChunkList.hpp>

namespace lfpAlloc {
template <std::size_t Size, std::size_t AllocationsPerChunk>
class Pool {
    using ChunkList_t = ChunkList<Size, AllocationsPerChunk>;

public:
    static constexpr auto CellSize =
        (Size > sizeof(void*)) ? Size - sizeof(void*) : 0;
    using Cell_t = Cell<CellSize>;

    Pool() : head_(nullptr) {}

    ~Pool() { ChunkList_t::getInstance().deallocateChain(head_); }

    void* allocate() {
        // Head loaded from head_
        Cell_t* currentHead = head_;
        Cell_t* next;

        // Out of cells to allocate
        if (!currentHead) {
            currentHead = ChunkList_t::getInstance().allocateChain();
        }

        next = currentHead->next_;
        head_ = next;
        return &currentHead->val_;
    }

    void deallocate(void* p) noexcept {
        auto newHead = reinterpret_cast<Cell_t*>(p);
        Cell_t* currentHead = head_;
        newHead->next_ = currentHead;
        head_ = newHead;
    }

private:
    Cell_t* head_;
};
}

#endif