class IBackend {
public:
    virtual ~IBackend() = default;
    virtual void test() = 0;
    virtual void init() = 0;
    virtual void cleanup() = 0;
};

extern "C" {
    __declspec(dllexport) IBackend* CreateBackend();
    __declspec(dllexport) void ReleaseBackend(IBackend* backend);
}
typedef IBackend* (*CreateBackendFunc)();
typedef void (*ReleaseBackendFunc)(IBackend*);
#pragma once