reapack

Package manager for REAPER
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dllimport.hpp (1526B)

      1 /* ReaPack: Package manager for REAPER
      2  * Copyright (C) 2015-2025  Christian Fillion
      3  *
      4  * This program is free software: you can redistribute it and/or modify
      5  * it under the terms of the GNU Lesser General Public License as published by
      6  * the Free Software Foundation, either version 3 of the License, or
      7  * (at your option) any later version.
      8  *
      9  * This program is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12  * GNU Lesser General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Lesser General Public License
     15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
     16  */
     17 
     18 #ifndef REAPACK_DLLIMPORT_HPP
     19 #define REAPACK_DLLIMPORT_HPP
     20 
     21 #ifndef _WIN32
     22 #  error This file should not be included on non-Windows systems.
     23 #endif
     24 
     25 #include <windows.h>
     26 
     27 template<typename Proc, typename = std::enable_if_t<std::is_function_v<Proc>>>
     28 class DllImport {
     29 public:
     30   DllImport(const wchar_t *dll, const char *func)
     31   {
     32     if (m_lib = LoadLibrary(dll))
     33       m_proc = reinterpret_cast<Proc *>(GetProcAddress(m_lib, func));
     34     else
     35       m_proc = nullptr;
     36   }
     37 
     38   ~DllImport()
     39   {
     40     if (m_lib)
     41       FreeLibrary(m_lib);
     42   }
     43 
     44   operator bool() const { return m_proc != nullptr; }
     45 
     46   template<typename... Args>
     47   auto operator()(Args&&... args) const { return m_proc(std::forward<Args>(args)...); }
     48 
     49 private:
     50   HINSTANCE m_lib;
     51   Proc *m_proc;
     52 };
     53 
     54 #endif