Compile Errors in Visual Studio 2019 about totalregistry

[zodiacon]

I don't get any issues. Do you have the C++ workload properly installed, along with the Windows SDK?

[steenstra]

I've installed 'Desktop development with C++', but not Universal Windows Platform Development, is that the one you mean with Windows SDK?

[zodiacon]

No. UWP is not required (although doesn't hurt). I can't tell what the issue is, but you could try installing the SDK by searching for "Windows 10 SDK Download" and installing that.

[steenstra]

The Windows SDK was already installed multiple times (different versions), apparently, but I removed them all and installed only the latest. When I try to build the solution, it fails in the same way.

In the console, there's this warning, it doesn't seem to be relevant, but just to be sure:

Build started...
1>------ Build started: Project: WTLHelper, Configuration: Debug x64 ------
1>cl : command line warning D9002: ignoring unknown option '/std:c++20'

[zodiacon]

Ah, it may be relevant. Change the project properties compiler settings to use C++17 or C++(latest)

[steenstra]

Changing it to C++17 almost works:

Severity	Code	Description	Project	File	Line	Suppression State
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Error	C7582	'Key': default member initializers for bit-fields requires at least '/std:c++latest'	RegExp	C:\path\to\repo\RegExp\RegExp\Registry.h	14	
Warning		The 'packages' element is not declared.	WTLHelper	C:\path\to\repo\RegExp\WTLHelper\packages.config	2	

When I changed it to 'Preview - Features from the Latest C++ Working Draft (/std:c++latest)', I got no errors!

========== Build All: 2 succeeded, 0 failed, 0 skipped ==========

Thanks for your help!