update boost

linx64/include/boost/callable_traits/detail/config.hpp

@@ -1,5 +1,5 @@
 /*
-@Copyright Barrett Adair 2016-2017
+@Copyright Barrett Adair 2016-2021
 
 Distributed under the Boost Software License, Version 1.0.
 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
@@ -57,11 +57,12 @@ Distributed under the Boost Software License, Version 1.0.
 #endif // #ifndef __clang__
 
 #ifdef _MSC_VER
-#  ifdef __clang__
-#    define BOOST_CLBL_TRTS_CLANG_C2
-#  else
+#  if !defined( __clang__ )
 #    define BOOST_CLBL_TRTS_MSVC
-#  endif // #ifdef __clang__
+#    if _MSC_VER < 1920
+#      define BOOST_CLBL_TRTS_OLD_MSVC
+#    endif // #if _MSC_VER < 1920
+#  endif // #if !defined( __clang__ )
 #endif // #ifdef _MSC_VER
 
 #define BOOST_CLBL_TRTS_IX_SEQ(...) ::std::index_sequence< __VA_ARGS__ >

linx64/include/boost/callable_traits/is_invocable.hpp

@@ -67,7 +67,7 @@ BOOST_CLBL_TRAITS_INLINE_VAR
 //->
 constexpr bool is_invocable_v = //see below
 //<-
-    detail::is_invocable_impl<detail::traits<T>, Args...>::type::value;
+    detail::is_invocable_impl<T, Args...>::type::value;
 //->
 
 // only available when variable templates are supported

linx64/include/boost/callable_traits/return_type.hpp

@@ -71,7 +71,7 @@ struct return_type : detail::return_type_impl<T> {};
 
 [heading Input/Output Examples]
 [table
-    [[`T`]                              [`return_type_t<T, std::tuple>`]]
+    [[`T`]                              [`return_type_t<T>`]]
     [[`void()`]                         [`void`]]
     [[`float(*)()`]                     [`float`]]
     [[`const char*(&)()`]               [`const char *`]]