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A marker type used to indicate that the type is the outer class of a composable class.
winrt::composing struct (C++/WinRT)
C++
09/20/2023
language-reference
windows 10, uwp, standard, c++, cpp, winrt, projection, api, reference, marker, type
cplusplus

winrt::composing marker struct (C++/WinRT)

A marker type used to indicate to the implements base struct that the type is the outer class of a composable class. This marker type is generated automatically by cppwinrt.exe when necessary, and you should avoid using it manually. For a usage example of marker types, see Marker types.

Syntax

struct winrt::composing

Remarks

If your runtime class derives from another runtime class, you can call methods on your base class by using the base_type type alias.

Requirements

Minimum supported SDK: Windows SDK version 10.0.17134.0 (Windows 10, version 1803)

Namespace: winrt

Header: %WindowsSdkDir%Include<WindowsTargetPlatformVersion>\cppwinrt\winrt\base.h (included by default)

See also