#pragma once
#include "ncx_slab.h"

class mempool {
public:
    mempool(size_t pool_size = 1024000) {
        const auto space = (u_char*)malloc(pool_size);

        mem_pool_ = (ncx_slab_pool_t*)space;
        mem_pool_->addr = space;
        mem_pool_->min_shift = 3;
        mem_pool_->end = space + pool_size;

        ncx_slab_init(mem_pool_);
    }
    ~mempool() {
        free(mem_pool_->addr);
    }
    [[nodiscard]] void* alloc(size_t size) const {
        return ncx_slab_alloc(mem_pool_, size);
    }

    template<typename T, typename ...Args>
    [[nodiscard]] T* alloc(Args&&... args) const {
        T* out = (T*)alloc(sizeof(T));
        new (out) T(std::forward<Args>(args)...);
        return out;
    }
    template<typename T>
    [[nodiscard]] T* alloc() const {
        T* out = (T*)alloc(sizeof(T));
        new (out) T();
        return out;
    }

    void free(void* p) const {
        ncx_slab_free(mem_pool_, p);
    }
    [[nodiscard]] ncx_slab_stat_t stat() const {
        ncx_slab_stat_t out;
        ncx_slab_stat(mem_pool_, &out);
        return out;
    }
private:
    ncx_slab_pool_t* mem_pool_ = nullptr;
};