To continue using the standard library Modules users will need /experimental:module as part of their command line options.Ĭ++20 added a new section to a primary Module interface known as the private Module fragment. The standard library Modules have not yet been standardized and as such remain experimental. The std.* Modules which ship with Visual Studio will not be available through /std:c++latest alone.The paper MSVC implements in order to convert module and import into keywords has even more scenarios: P1857R1. We have documented some of the common scenarios. Now that Modules are rolled into the latest language mode some code is subject to breakage due to module and import being converted into keywords.Note: enabling /permissive also disables the use of Modules. This means that customers currently relying on the permissive behavior of the compiler in combination with /std:c++latest are required to now apply /permissive on the command line. /std:c++latest now implies /permissive.There are a few caveats to implying C++ Modules under /std:c++latest: Since the merge of Modules into the C++20 standard (we can officially say C++20 now!) the compiler has been working towards C++20 Modules conformance until precisely such a time that we can confidently roll Modules into /std:c++latest. Since MSVC began down the path of implementing the Modules TS the toolset has always required the use of /experimental:module on any compilation. Project system changes to enable C++ Module scenarios.
Module linkage is a new type of linkage enforced by the back-end and linker.Include translation allows for easy adoption of header units without changing existing code.Private Module fragments are a new form of API encapsulation for primary Module interfaces.There is a lot to share, so let’s get right into it: What’s new? The toolset, project system, and IDE teams have been hard at work to create a first class C++ Modules experience in Visual Studio 2019. It has been some time since our last update regarding C++ Modules conformance. Please see our Visual Studio 2019 version 16.8 Preview 3 release notes for more of our latest features.
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