file.hpp

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#pragma once
 
#include <filesystem>
#include <string>
#include <functional>
#include <optional>
#include <cstdint>
#include <ios>
 
namespace Nui
{
    class AsyncFile
    {
      public:
        friend void openFile(
            char const* filename,
            std::ios_base::openmode mode,
            std::function<void(std::optional<AsyncFile>&&)> onOpen);
        friend void openFile(
            std::string const& filename,
            std::ios_base::openmode mode,
            std::function<void(std::optional<AsyncFile>&&)> onOpen);
        friend void openFile(
            std::filesystem::path const& filename,
            std::ios_base::openmode mode,
            std::function<void(std::optional<AsyncFile>&&)> onOpen);
 
      public:
        ~AsyncFile();
 
        void tellg(std::function<void(int32_t)> cb) const;
        void tellp(std::function<void(int32_t)> cb) const;
        void seekg(int32_t pos, std::function<void()> cb, std::ios_base::seekdir dir = std::ios_base::beg);
        void seekp(int32_t pos, std::function<void()> cb, std::ios_base::seekdir dir = std::ios_base::beg);
 
        void read(int32_t size, std::function<void(std::string&&)> cb);
        void readAll(std::function<void(std::string&&)> cb);
        void write(std::string const& data, std::function<void()> cb);
 
      private:
        AsyncFile(int32_t id);
 
      private:
        int32_t fileId_;
    };
    void openFile(
        char const* filename,
        std::ios_base::openmode mode,
        std::function<void(std::optional<AsyncFile>&&)> onOpen);
    void openFile(
        std::string const& filename,
        std::ios_base::openmode mode,
        std::function<void(std::optional<AsyncFile>&&)> onOpen);
    void openFile(
        std::filesystem::path const& filename,
        std::ios_base::openmode mode,
        std::function<void(std::optional<AsyncFile>&&)> onOpen);
}