Relocate StackableStreambuf to IOStreams.

IOStreams/StackableStreambuf.test/0.cc

@@ -0,0 +1,39 @@
+static_assert( __cplusplus > 2020'99 );
+
+#include "../StackableStreambuf.h"
+
+#include <fstream>
+
+#include <Alepha/Testing/test.h>
+#include <Alepha/Testing/TableTest.h>
+#include <Alepha/Utility/evaluation_helpers.h>
+
+#include <Alepha/word_wrap.h>
+
+namespace
+{
+	using namespace Alepha::Testing::literals::test_literals;;
+	using Alepha::Testing::TableTest;
+}
+
+static auto init= Alepha::Utility::enroll <=[]
+{
+	"Simple stacked wordwrap case."_test <=[]
+	{
+		std::ostringstream oss;
+
+		oss << Alepha::StartWrap{ 20 };
+		oss << "First wrapping\n";
+		oss << Alepha::StartWrap{ 10 };
+		oss << "Second wrapping\n";
+		oss << Alepha::EndWrap;
+		oss << "Third wrapping more than 20\n";
+		oss << Alepha::EndWrap;
+
+		std::ofstream log{ "log.txt" };
+		log << oss.str();
+		log.close();
+		std::cout << oss.str() << std::flush;
+		assert( oss.str() == "First wrapping\nSecond \nwrapping\nThird wrapping more \nthan 20\n" );
+	};
+};

IOStreams/StackableStreambuf.test/CMakeLists.txt

@@ -0,0 +1 @@
+unit_test( 0 )