-	Previously, we had the option of activating c++20.
	-	But as we defined c++20 as default, I suggest to replace
			this option as c++23.

	-	Previously, tests was in c++17
	-	We want to add c++20 by default, so I modify the test cmake
	-	The tests passed locally

	-	Previously, The MSVC version was not well recognized
		--> Hence, there was some bugy macro specific to MSVC/c++20
	-	This Commit resolve the issue and I am now able to
			compile the problematic testcase
	-	Question : SHould we add this flag not at the tets level
			but at the main CMakeFiles level ?

	-	Previously, on MSVC, in c++20, the empty() function was incorrectly deduced
	-	Hence the test_xbuilder no longer pass
	-	I suggest enforce the right specialization by specifying the last template parameter