#pragma once
#include "ncx_slab.h"
#include <cstdlib>

template<int32_t alignment = 64>
class mempool {
public:
    mempool(size_t pool_size = 1024000) { // 1024KB
        // 分配一个缓存对齐的内存
        // const auto space = static_cast<u_char*>(operator new(pool_size, std::align_val_t(alignment)));
        const auto space = static_cast<u_char*>(malloc(pool_size));

        mem_pool_            = reinterpret_cast<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() {
        // operator delete(mem_pool_->addr, std::align_val_t(alignment));
        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;
};