cpp1x

Controls whether or not to enable support to experimental features made available in the 1x version of C++ standard.

  #pragma cpp1x on | off | reset  

If you enable this pragma, you can use the following extensions to the 1x or 05 version of the C++ standard that would otherwise be invalid:

• Enables support for __alignof__.
• Enables support for __decltype__, which is a reference type preserving typeof.
• Enables support for nullptr.
• Enables support to allow >> to terminate nested template argument lists.
• Enables support for __static_assert.
  Note: This pragma enables support to experimental and unvalidated implementations of features that may or may not be available in the final version of the C++ standard. The features should not be used for critical or production code.