git.sesse.net Git - casparcg/blob - common/concurrency/com_context.h

   1 #pragma once\r
   2 \r
   3 #include "executor.h"\r
   4 \r
   5 #define NOMINMAX\r
   6 #define WIN32_LEAN_AND_MEAN\r
   7 \r
   8 #include <Windows.h>\r
   9 \r
  10 #include <boost/noncopyable.hpp>\r
  11 \r
  12 #include <functional>\r
  13 \r
  14 namespace caspar {\r
  15 \r
  16 template<typename T>\r
  17 class com_context : public executor\r
  18 {\r
  19         std::unique_ptr<T> instance_;\r
  20 public:\r
  21         com_context(const std::wstring& name) : executor(name)\r
  22         {\r
  23                 executor::begin_invoke([]\r
  24                 {\r
  25                         ::CoInitialize(nullptr);\r
  26                 });\r
  27         }\r
  28 \r
  29         ~com_context()\r
  30         {\r
  31                 executor::invoke([&]\r
  32                 {\r
  33                         instance_.reset(nullptr);\r
  34                         ::CoUninitialize();\r
  35                 });\r
  36         }\r
  37         \r
  38         void reset(const std::function<T*()>& factory = nullptr)\r
  39         {\r
  40                 executor::invoke([&]\r
  41                 {\r
  42                         instance_.reset();\r
  43                         if(factory)\r
  44                                 instance_.reset(factory());\r
  45                 });\r
  46         }\r
  47 \r
  48         T& operator*() const { return *instance_.get();}  // noexcept\r
  49 \r
  50         T* operator->() const { return instance_.get();}  // noexcept\r
  51 \r
  52         T* get() const { return instance_.get();}  // noexcept\r
  53 \r
  54         operator bool() const {return get() != nullptr;}\r
  55 };\r
  56 \r
  57 }