FFaDynamicLibraryBase.H

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// SPDX-FileCopyrightText: 2023 SAP SE
//
// SPDX-License-Identifier: Apache-2.0
//
// This file is part of FEDEM - https://openfedem.org
 
#ifndef FFA_DYNAMIC_LIBRARY_BASE_H
#define FFA_DYNAMIC_LIBRARY_BASE_H
 
#include <map>
#include <vector>
#include <string>
 
#if defined(win32) || defined(win64)
#define NOGDI
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
typedef void (*DLPROC) ();
#else
typedef void* DLPROC;
#endif
 
 
class FFaDynamicLibraryBase
{
protected:
  FFaDynamicLibraryBase() {}
  virtual ~FFaDynamicLibraryBase() { this->unloadAll(); }
 
  enum LanguageBinding { Undefined, C, Fortran };
 
public:
  bool load(const std::string& libName, bool silence = false);
  bool unload(const std::string& libName, bool silence = false);
  void unloadAll();
  bool areLibsLoaded() const { return !myLibHandles.empty(); }
  const char* getLibrary(size_t idx = 1) const;
 
protected:
  DLPROC getProcAddr(const std::string& fName, bool silence = false) const;
  DLPROC getProcAddr(const std::string& cName, const std::string& fName,
                     LanguageBinding& lang, bool silence = false) const;
  DLPROC getProcAddress(const std::string& fName, size_t procID) const;
  DLPROC getProcAddress(const std::string& cName, const std::string& fName,
                        LanguageBinding& lang, size_t procID) const;
 
private:
#if defined(win32) || defined(win64)
  typedef std::pair<LanguageBinding,HINSTANCE> LibHandle;
#else
  typedef std::pair<LanguageBinding,void*> LibHandle;
#endif
  typedef std::pair<DLPROC,LanguageBinding> cache_info;
 
  mutable std::vector<cache_info> myProcCache;  
  std::map<std::string,LibHandle> myLibHandles; 
 
  static DLPROC getAddress(const LibHandle& lib, const std::string& fname);
};
 
#endif