backend_loader.h

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#pragma once
 
#include <knp/core/backend.h>
#include <knp/core/impexp.h>
 
#include <filesystem>
#include <memory>
#include <string>
#include <unordered_map>
 
 
namespace knp::framework
{
 
class KNP_DECLSPEC BackendLoader
{
public:
    std::shared_ptr<core::Backend> load(const std::filesystem::path &backend_path);
    static bool is_backend(const std::filesystem::path &backend_path);
 
public:
    typedef std::shared_ptr<core::Backend>(BackendCreateFunction)();
 
protected:
    std::function<BackendCreateFunction> make_creator(const std::filesystem::path &backend_path);
 
private:
    // std::filesystem::path doesn't work on any compilers.
    std::unordered_map<std::string, std::function<BackendCreateFunction>> creators_;
};
 
}  // namespace knp::framework