diff --git a/libs/string/example/literals_to_string.cpp b/libs/string/example/literals_to_string.cpp
new file mode 100644
index 00000000..e77bdeea
--- /dev/null
+++ b/libs/string/example/literals_to_string.cpp
@@ -0,0 +1,60 @@
+//
+// 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/osyo-manga/cpp-half/blob/master/README
+//
+// License:
+// Boost Software License - Version 1.0
+// <http://www.boost.org/LICENSE_1_0.txt>
+//
+#include <sprout/string.hpp>
+
+
+int
+main(){
+	
+	//
+	// String literal to Sprout.String
+	//
+	{
+		static constexpr auto str1 = sprout::to_string("homu");
+		static_assert(str1 == "homu", "");
+		static_assert(std::is_same<decltype(str1), sprout::string<4> const>{}, "");
+
+		static constexpr auto str2 = sprout::to_string(L"ほむほむ");
+		static_assert(str2 == L"ほむほむ", "");
+		static_assert(std::is_same<decltype(str2), sprout::wstring<4> const>{}, "");
+	}
+	
+	//
+	// Integer literal to Sprout.String
+	//
+	{
+		static constexpr auto str = sprout::to_string(42);
+		static_assert(str == "42", "");
+	}
+	
+	//
+	// Float literal to Sprout.String
+	//
+	{
+		static constexpr auto str = sprout::to_string(3.14f);
+		static_assert(str == "3.140000", "");
+	}
+
+	//
+	// Char literal to Sprout.String
+	//
+	{
+		static constexpr auto str = sprout::make_string('m', 'a', 'd', 'o');
+		static_assert(str == "mado", "");
+		static_assert(std::is_same<decltype(str), sprout::string<4> const>{}, "");
+	}
+
+	return 0;
+}
diff --git a/libs/string/example/simple.cpp b/libs/string/example/simple.cpp
new file mode 100644
index 00000000..a0d033aa
--- /dev/null
+++ b/libs/string/example/simple.cpp
@@ -0,0 +1,89 @@
+//
+// 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/osyo-manga/cpp-half/blob/master/README
+//
+// License:
+// Boost Software License - Version 1.0
+// <http://www.boost.org/LICENSE_1_0.txt>
+//
+#include <sprout/string.hpp>
+#include <iostream>
+#include <sstream>
+#include <cassert>
+
+
+//
+// Sprout.String is constexpr string object
+//
+int
+main(){
+	
+	//
+	// String literal to Sprout.String
+	//
+	static constexpr sprout::string<4> str1 = sprout::to_string("homu");
+	static constexpr auto              str2 = sprout::to_string("mado");
+	static constexpr auto              str3 = sprout::to_string(42);
+
+	//
+	// Comparison
+	//
+	static_assert(str1 == sprout::to_string("homu"), "");
+	static_assert(str2 == "mado", "");
+	static_assert(str3 == "42", "");
+	static_assert(str1 != str2, "");
+// 	static_assert(str4 == "97", "");
+
+	//
+	// Accessor
+	//
+	static_assert(str1.front() == 'h', "");
+	static_assert(str1[1]      == 'o', "");
+	static_assert(str1.at(2)   == 'm', "");
+	static_assert(str1.back()  == 'u', "");
+
+	//
+	// String concatenation
+	//
+	static_assert((str1 + "homu") == "homuhomu", "");
+	static_assert((str1 + str2)   == "homumado", "");
+	static_assert((str1 + sprout::to_string("42"))   == "homu42", "");
+
+	//
+	// C style string
+	//
+	constexpr char const* cp = str1.c_str();
+	static_assert(cp[0] == 'h', "");
+
+	//
+	// Iterator
+	//
+	static_assert(*str1.begin()        == 'h', "");
+	static_assert(*(str1.end() - 1)    == 'u', "");
+	static_assert(*(str1.rbegin() + 1) == 'm', "");
+	static_assert(*(str1.rend() - 2)   == 'o', "");
+	
+	//
+	// IOStream
+	//
+	{
+		std::ostringstream os;
+		os << str1;
+		assert(os.str() == "homu");
+	}
+	{
+		std::istringstream is("mami");
+		sprout::string<4> str;
+		is >> str;
+		assert(str == "mami");
+	}
+
+
+	return 0;
+}