Unable to initialize winrt::hstring using nullptr

[trenthoppe]

When attempting to initialize a null winrt::hstring using the documented syntax:

winrt::hstring{ nullptr }

I receive - Error C228 'winrt::hstring::hstring(std::nullptr_t)': attempting to reference a deleted function.

If I initialize it using an empty string: L"", which is identical to null, it works fine. Is this the correct way to initialize a null winrt::hstring? Or is this unintended behavior?

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 853d8f9e-c1eb-7fe8-4ce2-a476d8cb1fc9
• Version Independent ID: 924da36c-5517-190d-edda-5bd500830d81
• Content: Move to C++/WinRT from C++/CX - Windows UWP applications
• Content Source: windows-apps-src/cpp-and-winrt-apis/move-to-winrt-from-cx.md
• Product: uwp
• Technology: platform
• GitHub Login: @stevewhims
• Microsoft Alias: stwhi

[stevewhims]

Yes, that looks like it was meant to be hstring{} instead of the syntactically invalid hstring{ nullptr}. I just published a fix to the topic (in the two places it was wrong).

To create a local, "null", hstring, I'd write

winrt::hstring myString;

To pass a "null" hstring into a function that takes an hstring, I'd write

winrt::hstring myString;
Foo(myString);

// Or

Foo(winrt::hstring{});

I'll go ahead and close the issue. Thanks for finding this!

Steve