LibraryLoader.h

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#pragma once 
 
#include <windows.h>
#include <iostream>
 
namespace Core
{
class LibraryLoader final
{
public:
    HMODULE handle;
 
    LibraryLoader() : handle(nullptr) {}
    LibraryLoader(const wchar_t* fileName) : handle(LoadLibrary(fileName))
    {
        if (!handle)
            std::wcerr << "ERROR: unable to load library " << fileName<< ". Reason: " << GetLastError() << std::endl;
    }
    LibraryLoader(HMODULE h) : handle(h) {}
    LibraryLoader(LibraryLoader&& ll) : handle(ll.handle) { ll.handle = nullptr; }
    LibraryLoader& operator=(LibraryLoader&& ll)
    {
        if (handle)
            FreeLibrary(handle);
        handle = ll.handle;
        ll.handle = nullptr;
    }
    ~LibraryLoader()
    {
        if (handle)
            FreeLibrary(handle);
    }
 
    LibraryLoader(const LibraryLoader&) = delete;
    LibraryLoader& operator=(const LibraryLoader&) = delete;
 
    bool valid() const { return handle != nullptr; }
    bool load(const wchar_t* filename)
    {
        if (handle)
            FreeLibrary(handle);
        handle = LoadLibrary(filename);
        return handle != nullptr;
    }
    void free()
    {
        if (handle)
        {
            FreeLibrary(handle);
            handle = nullptr;
        }
    }
    template <typename T>
    T resolve(const char* funcName)
    {
        return reinterpret_cast<T>(GetProcAddress(handle, funcName));
    }
};
 
 
}  // namespace Core