awaitable examples.

Closes #2104.

example/advanced/CMakeLists.txt

@@ -9,3 +9,4 @@
 
 add_subdirectory (server)
 add_subdirectory (server-flex)
+add_subdirectory (server-flex-awaitable)

example/advanced/Jamfile

@@ -11,3 +11,6 @@ build-project server ;
 
 # SSL
 build-project server-flex ;
+
+# C++20
+build-project server-flex-awaitable ;

example/advanced/server-flex-awaitable/CMakeLists.txt

@@ -0,0 +1,31 @@
+#
+# Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+#
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#
+# Official repository: https://github.com/boostorg/beast
+#
+
+if (OPENSSL_FOUND)
+    GroupSources(include/boost/beast beast)
+    GroupSources(example/common common)
+    GroupSources(example/advanced/server-flex-awaitable "/")
+
+    add_executable (advanced-server-flex-awaitable
+        ${BOOST_BEAST_FILES}
+        ${PROJECT_SOURCE_DIR}/example/common/server_certificate.hpp
+        Jamfile
+            advanced_server_flex_awaitable.cpp
+    )
+
+    set_property(TARGET advanced-server-flex-awaitable PROPERTY FOLDER "example-advanced-server")
+    
+    target_link_libraries (advanced-server-flex-awaitable
+        OpenSSL::SSL OpenSSL::Crypto
+        lib-asio
+        lib-asio-ssl
+        lib-beast
+        )
+
+endif()

example/advanced/server-flex-awaitable/Jamfile

@@ -0,0 +1,22 @@
+#
+# Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+#
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#
+# Official repository: https://github.com/boostorg/beast
+#
+
+import ac ;
+
+project
+    : requirements
+        [ ac.check-library /boost/beast//lib-asio-ssl : <library>/boost/beast//lib-asio-ssl/<link>static : <build>no ]
+    ;
+
+exe advanced-server-flex-awaitable :
+    advanced_server_flex_awaitable.cpp
+    :
+    <variant>coverage:<build>no
+    <variant>ubasan:<build>no
+    ;