diff --git a/libs/string/example/c_str_to_sprout_string.cpp b/libs/string/example/c_str_to_sprout_string.cpp
new file mode 100644
index 00000000..43187bdb
--- /dev/null
+++ b/libs/string/example/c_str_to_sprout_string.cpp
@@ -0,0 +1,44 @@
+//
+// Sprout C++ Library
+//
+// Copyright (c) 2012
+// bolero-MURAKAMI : http://d.hatena.ne.jp/boleros/
+// osyo-manga : http://d.hatena.ne.jp/osyo-manga/
+//
+// Readme:
+// https://github.com/bolero-MURAKAMI/Sprout/blob/master/README
+//
+// License:
+// Boost Software License - Version 1.0
+// <http://www.boost.org/LICENSE_1_0.txt>
+//
+#include <sprout/string.hpp>
+
+//
+// C style string to Sprout.String
+//
+int
+main(){
+	
+	constexpr char const* c_str = "homu";
+
+	//
+	// String length is required
+	//
+	constexpr auto length = sprout::char_traits<char>::length(c_str);
+	static_assert(length == 4, "");
+	
+	//
+	// To Sprout.String
+	//
+	constexpr auto str = sprout::string_from_c_str<length>( c_str );
+	static_assert(std::is_same<sprout::string<4> const, decltype(str)>{}, "");
+	static_assert(str == "homu", "");
+
+	constexpr auto str2 = sprout::string_from_c_str<length>( c_str, 2 );
+	static_assert(std::is_same<sprout::string<4> const, decltype(str2)>{}, "");
+	static_assert(str2 == "ho", "");
+
+	
+	return 0;
+}
diff --git a/libs/weed/example/as_tuple.cpp b/libs/weed/example/as_tuple.cpp
new file mode 100644
index 00000000..75b93582
--- /dev/null
+++ b/libs/weed/example/as_tuple.cpp
@@ -0,0 +1,67 @@
+//
+// Sprout C++ Library
+//
+// Copyright (c) 2012
+// bolero-MURAKAMI : http://d.hatena.ne.jp/boleros/
+// osyo-manga : http://d.hatena.ne.jp/osyo-manga/
+//
+// Readme:
+// https://github.com/bolero-MURAKAMI/Sprout/blob/master/README
+//
+// License:
+// Boost Software License - Version 1.0
+// <http://www.boost.org/LICENSE_1_0.txt>
+//
+#include <sprout/weed.hpp>
+
+
+int
+main(){
+	namespace w = sprout::weed;
+
+	static constexpr auto source = sprout::to_string("homu:mado");
+	
+	// String parser
+	static constexpr auto item = *w::lim<4>(w::char_ - ':');
+	
+	
+	//
+	// If you do not want to use the as_tuple
+	//
+	{
+		static constexpr auto parser = item >> ':' >> item;
+
+		static constexpr auto result = w::parse(
+			sprout::begin(source), sprout::end(source), parser
+		);
+		static_assert(result.success(), "");
+
+		// !!!!
+		static_assert(result.attr() == "homumado", "");
+	}
+	
+
+	//
+	// You need to use the as_tuple
+	//
+	{
+		static constexpr auto parser = w::as_tuple[item] >> ':' >> w::as_tuple[item];
+
+		static constexpr auto result = w::parse(
+			sprout::begin(source), sprout::end(source), parser
+		);
+		static_assert(result.success(), "");
+
+		static constexpr auto attr = result.attr();
+
+		// OK
+		static_assert(std::is_same<
+			sprout::tuple<sprout::string<4>, sprout::string<4>> const,
+			decltype(attr)
+		>::value, "");
+		static_assert(sprout::get<0>(attr) == "homu", "");
+		static_assert(sprout::get<1>(attr) == "mado", "");
+	}
+	
+	return 0;
+}