New name for polymorphic executor. Trait for detecting new executors

include/boost/beast/core/async_base.hpp

@@ -182,7 +182,7 @@ class async_base
 #endif
 {
     static_assert(
-        net::is_executor<Executor1>::value,
+        net::is_executor<Executor1>::value || net::execution::is_executor<Executor1>::value,
         "Executor type requirements not met");
 
     Handler h_;

include/boost/beast/core/basic_stream.hpp

@@ -182,7 +182,7 @@ namespace beast {
 
     @tparam Executor A type meeting the requirements of <em>Executor</em> to
     be used for submitting all completion handlers which do not already have an
-    associated executor. If this type is omitted, the default of `net::executor`
+    associated executor. If this type is omitted, the default of `net::any_io_executor`
     will be used.
 
     @par Thread Safety
@@ -197,7 +197,7 @@ namespace beast {
 */
 template<
     class Protocol,
-    class Executor = net::executor,
+    class Executor = net::any_io_executor,
     class RatePolicy = unlimited_rate_policy
 >
 class basic_stream
@@ -233,7 +233,8 @@ public:
     using endpoint_type = typename Protocol::endpoint;
 
 private:
-    static_assert(net::is_executor<Executor>::value,
+    static_assert(
+        net::is_executor<Executor>::value || net::execution::is_executor<Executor>::value,
         "Executor type requirements not met");
 
     struct impl_type

include/boost/beast/core/detail/get_io_context.hpp

@@ -56,7 +56,7 @@ get_io_context(net::strand<Executor> const& ex)
 template<
     class T,
     class = typename std::enable_if<
-        std::is_same<T, net::executor>::value>::type>
+        std::is_same<T, net::executor>::value || std::is_same<T, net::any_io_executor>::value>::type>
 net::io_context*
 get_io_context(T const& ex)
 {

include/boost/beast/core/tcp_stream.hpp

@@ -25,7 +25,7 @@ namespace beast {
 */
 using tcp_stream = basic_stream<
     net::ip::tcp,
-    net::executor,
+    net::any_io_executor,
     unlimited_rate_policy>;
 
 } // beast