masfj/unique_ptr<CFURLRef>.md

Last active December 12, 2015 03:39

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愚直に書くと発狂しそうになるシリーズ

Raw

    std::unique_ptr<std::remove_pointer<CFURLRef>::type, decltype(&CFRelease)> file(CFURLCreateFromFileSystemRepresentation(nullptr,
                                                                                                                        reinterpret_cast<const unsigned char*>(filename.c_str()),
                                                                                                                        filename.length(),
                                                                                                                        false),
                                                                                CFRelease);
std::unique_ptr<std::remove_pointer<decltype(CFURLCreateFromFileSystemRepresentation(std::declval<CFAllocatorRef>(), std::declval<const unsigned char*>(), std::declval<CFIndex>(), std::declval<bool>()))>::type, decltype(&CFRelease)> file{CFURLCreateFromFileSystemRepresentation(nullptr,
                                                                                                                                                                                                                                                                                      reinterpret_cast<const unsigned char*>(filename.c_str()),
                                                                                                                                                                                                                                                                                      filename.length(),
                                                                                                                                                                                                                                                                                      false),
                                                                                                                                                                                                                                              CFRelease};

  

Author

masfj commented Dec 12, 2015

struct deleter
{
  using pointer = decltype(CFURLCreateFromFileSystemRepresentation(std::declval<CFAllocatorRef>(),
                                                                   std::declval<const unsigned char*>(),
                                                                   std::declval<CFIndex>(),
                                                                   std::declval<bool>()));
  void
  operator()(pointer obj)
  {
    CFRelease(obj);
  }
}; // struct deleter

std::unique_ptr<deleter::pointer, deleter> file{CFURLCreateFromFileSystemRepresentation(nullptr,
                                                                                        reinterpret_cast<const unsigned char*>(filename.c_str()),
                                                                                        filename.length(),
                                                                                        false),
                                                deleter{}};

Author

masfj commented Dec 12, 2015

1statementでがんばろうとしてはいけない