CMakeLists.txt: requires C++23 standard

CMakeLists.txt: add compiler version checks
adc_netserver.h: add AdcTrivialLogger class (use of 'deduced this'
feature of C++23 standard); AdcGenericNetServer class now has basic
based on std::basic_ostream logging capability

CMakeLists.txt

@@ -4,10 +4,31 @@ project(ADC LANGUAGES CXX)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}")
 
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # set(CMAKE_BUILD_TYPE Release)
 
+#
+# check compiler version to ensure supporting of
+# 'deducing this' C++23 feature
+#
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 14.0)
+        message(FATAL_ERROR "GCC version must be at least 14.0!")
+    endif()
+elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
+        message(FATAL_ERROR "Clang version must be at least 18.0!")
+    endif()
+elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "19.32")
+         message(FATAL_ERROR "MSVC version must be at least 19.32")
+    endif()
+else()
+    message(WARNING "You are using an unsupported compiler! Compilation has only been tested with Clang and GCC.")
+endif()
+
+
 
 set(ADC_COMMON_HEADERS
     common/adc_traits.h
@@ -29,7 +50,7 @@ set(ADC_NETWORK_HEADERS
     # net/adc_netmsg.h
     # net/adc_netmessage.h
     net/adc_netproto.h
-    net/adc_netservice.h    
+    # net/adc_netservice.h
     net/adc_endpoint.h
     net/adc_netserver.h
     net/adc_net_concepts.h