List delimiting primitive for output streams.

delimited_list.h

@@ -0,0 +1,42 @@
+static_assert( __cplusplus > 2020'99 );
+
+#pragma once
+
+#include <Alepha/Alepha.h>
+
+#include <ostream>
+
+#include <Alepha/IOStreams/StackableStreambuf.h>
+
+namespace Alepha::Hydrogen  ::detail::  delimited_list_m
+{
+	inline namespace exports {}
+
+	struct DelimitedList_params
+	{
+		const std::string delimiter;
+
+		explicit DelimitedList_params( const std::string delimiter ) : delimiter( delimiter ) {}
+	};
+
+	struct MarkItem_t {};
+
+	namespace exports
+	{
+		constexpr MarkItem_t NextItem;;
+
+		using StartDelimitedList= IOStreams::PushStack< DelimitedList_params >;
+		constexpr IOStreams::PopStack EndDelimitedList;
+	}
+
+	inline namespace impl
+	{
+		void build_streambuf( std::ostream &, StartDelimitedList && );
+		std::ostream &operator << ( std::ostream &os, MarkItem_t ); 
+	}
+}
+
+namespace Alepha::Hydrogen::inline exports::inline delimited_list_m
+{
+	using namespace detail::delimited_list_m::exports;
+}