Library.h

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#pragma once
 
#ifndef _LIBRARY_H
#define _LIBRARY_H
 
#include <iostream>
 
#if defined(__linux__) || defined(__APPLE__)
 
#include <dlfcn.h>
 
#elif defined(_WIN32)
 
#include <windows.h>
#undef min
#undef max
 
#endif
 
namespace Utils {
 
class Library {
 public:
  Library(const Library &) = delete;
  Library &operator=(const Library &) = delete;
  Library(Library &&) = default;
  Library &operator=(Library &&) = default;
 
  Library() noexcept {}
 
  virtual ~Library() {
    if (handle)
#if defined(__linux__) || defined(__APPLE__)
      dlclose(handle);
#elif defined(_WIN32)
      FreeLibrary(handle);
#endif
  }
 
  virtual bool Init(const char *libName) noexcept {
#if defined(__linux__) || defined(__APPLE__)
    handle = dlopen(libName, RTLD_NOW);
 
    if (handle == nullptr) {
      const char *dlsym_error = dlerror();
      if (!mute && dlsym_error)
        std::cerr << "Library: Unable to load library, error: " << dlsym_error
                  << std::endl;
 
      return false;
    }
#elif defined(_WIN32)
    handle = LoadLibraryA(libName);
    if (handle == nullptr) {
      const DWORD error = GetLastError();
      if (!mute)
        std::cerr << "Library: Unable to load library, error code: " << error
                  << std::endl;
      return false;
    }
#endif
 
    return true;
  }
 
  void *GetFunction(const char *funcName) noexcept {
#if defined(__linux__) || defined(__APPLE__)
    return dlsym(handle, funcName);
#elif defined(_WIN32)
    return GetProcAddress(handle, funcName);
#endif
  }
 
  const void *GetHandle() const noexcept { return handle; }
 
  bool IsMuted() const noexcept { return mute; }
 
  void SetMute(bool m) noexcept { mute = m; }
 
 private:
#if defined(__linux__) || defined(__APPLE__)
  void *handle = nullptr;
#elif defined(_WIN32)
  HINSTANCE handle = nullptr;
#endif
  bool mute = false;
};
 
}  // namespace Utils
 
#endif