Add IStreamable helper.

IOStreams/IStreamable.test/0.cc

@@ -0,0 +1,52 @@
+static_assert( __cplusplus > 2020'00 );
+
+#include "../IStreamable.h"
+
+#include <Alepha/Testing/TableTest.h>
+#include <Alepha/Testing/test.h>
+
+#include <sstream>
+
+namespace
+{
+	template< typename= Alepha::Capabilities< Alepha::IOStreams::IStreamable > >
+	struct Agg_core
+	{
+		int x;
+		int y;
+		int z;
+
+		friend bool operator == ( const Agg_core &lhs, const Agg_core &rhs )= default;
+		friend std::ostream &
+		operator << ( std::ostream &os, const Agg_core &agg )
+		{
+			return os << "{ " << agg.x << ", " << agg.y << ", " << agg.z << " }";
+		}
+	};
+
+	using Agg= Agg_core<>;
+	static_assert( Alepha::Aggregate< Agg > );
+	static_assert( Alepha::Capability< Agg, Alepha::IOStreams::IStreamable > );
+}
+
+
+auto
+buildFromString( const std::string text )
+{
+	Agg rv;
+	std::istringstream iss{ text };
+	iss >> rv;
+	return rv;
+}
+
+static auto init= Alepha::Utility::enroll <=[]
+{
+	using namespace Alepha::Testing::exports;
+	using namespace Alepha::Testing::literals::test_literals;
+
+	"Simple IStream"_test <=TableTest< buildFromString >
+	::Cases
+	{
+		{ "smoke test", { "1\t2\t3" }, { 1, 2, 3 } },
+	};
+};

IOStreams/IStreamable.test/CMakeLists.txt

@@ -0,0 +1,2 @@
+link_libraries( unit-test )
+unit_test( 0 )