Update supported compilers in documentation and README

.drone.jsonnet

@@ -249,12 +249,24 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
         { TOOLSET: 'msvc-14.1', CXXSTD: '14,17,latest' },
     ),
 
+    windows_pipeline(
+        "Windows VS2017 msvc-14.1 Strict",
+        "cppalliance/dronevs2017",
+        { TOOLSET: 'msvc-14.1', CXXSTD: '14,17,latest', CXXFLAGS: '/permissive-' },
+    ),
+
     windows_pipeline(
         "Windows VS2019 msvc-14.2",
         "cppalliance/dronevs2019",
         { TOOLSET: 'msvc-14.2', CXXSTD: '14,17,20,latest' },
     ),
 
+    windows_pipeline(
+        "Windows VS2019 msvc-14.2 Strict",
+        "cppalliance/dronevs2019",
+        { TOOLSET: 'msvc-14.2', CXXSTD: '14,17,20,latest', CXXFLAGS: '/permissive-' },
+    ),
+
     windows_pipeline(
         "Windows VS2022 msvc-14.3",
         "cppalliance/dronevs2022:1",

.drone/drone.bat

@@ -20,4 +20,5 @@ b2 -d0 headers
 
 if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
 if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
-b2 -j3 libs/%LIBRARY%/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release embed-manifest-via=linker
+if not "%CXXFLAGS%" == "" set CXXFLAGS=cxxflags=%CXXFLAGS%
+b2 -j3 libs/%LIBRARY%/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% %CXXFLAGS% variant=debug,release embed-manifest-via=linker

README.md

@@ -12,7 +12,7 @@ Supported compilers:
 
 * g++ 4.8 or later with `-std=c++11` or above
 * clang++ 3.9 or later with `-std=c++11` or above
-* Visual Studio 2015, 2017, 2019
+* Visual Studio 2015 or later
 
 Tested on [Github Actions](https://github.com/boostorg/variant2/actions) and
 [Appveyor](https://ci.appveyor.com/project/pdimov/variant2-fkab9).

appveyor.yml

@@ -21,6 +21,11 @@ environment:
       TOOLSET: msvc-14.1
       ADDRMD: 32,64
       CXXSTD: 14,17,latest
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc-14.1
+      ADDRMD: 32,64
+      CXXSTD: 14,17,latest
+      CXXFLAGS: /permissive-
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       TOOLSET: clang-win
       ADDRMD: 64
@@ -51,4 +56,5 @@ build: off
 test_script:
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
   - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
-  - b2 -j3 libs/variant2/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release embed-manifest-via=linker
+  - if not "%CXXFLAGS%" == "" set CXXFLAGS=cxxflags=%CXXFLAGS%
+  - b2 -j3 libs/variant2/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% %CXXFLAGS% variant=debug,release embed-manifest-via=linker

doc/variant2/changelog.adoc

@@ -1,5 +1,5 @@
 ////
-Copyright 2019-2021 Peter Dimov
+Copyright 2019-2022 Peter Dimov
 Distributed under the Boost Software License, Version 1.0.
 https://www.boost.org/LICENSE_1_0.txt
 ////
@@ -8,6 +8,10 @@ https://www.boost.org/LICENSE_1_0.txt
 # Revision History
 :idprefix: changelog_
 
+## Changes in 1.81.0
+
+* Added support for `boost::json::value_from` and `boost::json::value_to`.
+
 ## Changes in 1.79.0
 
 * Added `operator<<` for `monostate`.

doc/variant2/implementation.adoc

@@ -16,7 +16,7 @@ This implementation only depends on Boost.Config, Boost.Assert, and Boost.Mp11.
 
 * GCC 4.8 or later with `-std=c++11` or above
 * Clang 3.9 or later with `-std=c++11` or above
-* Visual Studio 2015, 2017, 2019
+* Visual Studio 2015 or later
 
 Tested on https://github.com/boostorg/variant2/actions[Github Actions] and
 https://ci.appveyor.com/project/pdimov/variant2-fkab9[Appveyor].

include/boost/variant2/variant.hpp

@@ -2448,6 +2448,11 @@ struct tag_invoke_L1
 {
     boost::json::value& v;
 
+#if defined(BOOST_MSVC) && BOOST_MSVC / 10 == 191
+    // msvc-14.1 with /permissive- needs this
+    explicit tag_invoke_L1( boost::json::value& v_ ): v( v_ ) {}
+#endif
+
     template<class T> void operator()( T const& t ) const
     {
         boost::json::value_from( t, v );