diff --git a/sprout/preprocessor/config.hpp b/sprout/preprocessor/config.hpp
index abda9661..5dbf0af6 100644
--- a/sprout/preprocessor/config.hpp
+++ b/sprout/preprocessor/config.hpp
@@ -43,4 +43,15 @@
 #	define SPROUT_PP_VARIADICS 0
 #endif
 
+//
+// SPROUT_PP_HAS_COUNTER
+//
+#ifdef __COUNTER__
+#	undef SPROUT_PP_HAS_COUNTER
+#	define SPROUT_PP_HAS_COUNTER 1
+#else
+#	undef SPROUT_PP_HAS_COUNTER
+#	define SPROUT_PP_HAS_COUNTER 0
+#endif
+
 #endif	// #ifndef SPROUT_PREPROCESSOR_CONFIG_HPP
diff --git a/sprout/preprocessor/some_number.hpp b/sprout/preprocessor/some_number.hpp
index 3e5fe0bb..b0425c9e 100644
--- a/sprout/preprocessor/some_number.hpp
+++ b/sprout/preprocessor/some_number.hpp
@@ -9,13 +9,25 @@
 #define SPROUT_PREPROCESSOR_SOME_NUMBER_HPP
 
 #include <sprout/config.hpp>
+#include <sprout/preprocessor/config.hpp>
 #include <sprout/preprocessor/empty.hpp>
 
+//
+// SPROUT_PP_SOME_NUMBER_IS_UNIQUE_IN_LINE
+//
+#if SPROUT_PP_HAS_COUNTER
+#	undef SPROUT_PP_SOME_NUMBER_IS_UNIQUE_IN_LINE
+#	define SPROUT_PP_SOME_NUMBER_IS_UNIQUE_IN_LINE 1
+#else
+#	undef SPROUT_PP_SOME_NUMBER_IS_UNIQUE_IN_LINE
+#	define SPROUT_PP_SOME_NUMBER_IS_UNIQUE_IN_LINE 0
+#endif
+
 //
 // SPROUT_PP_SOME_NUMBER
 // SPROUT_PP_SOME_NUMBER_OR_EMPTY
 //
-#ifdef __COUNTER__
+#if SPROUT_PP_HAS_COUNTER
 #	define SPROUT_PP_SOME_NUMBER() __COUNTER__
 #	define SPROUT_PP_SOME_NUMBER_OR_EMPTY() SPROUT_PP_SOME_NUMBER()
 #else
diff --git a/sprout/preprocessor/str.hpp b/sprout/preprocessor/str.hpp
new file mode 100644
index 00000000..0b659864
--- /dev/null
+++ b/sprout/preprocessor/str.hpp
@@ -0,0 +1,18 @@
+/*=============================================================================
+  Copyright (c) 2011-2016 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  Distributed under the Boost Software License, Version 1.0. (See accompanying
+  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#ifndef SPROUT_PREPROCESSOR_STR_HPP
+#define SPROUT_PREPROCESSOR_STR_HPP
+
+#include <sprout/config.hpp>
+
+//
+// SPROUT_PP_STR
+//
+#define SPROUT_PP_STR(str) str
+
+#endif	// #ifndef SPROUT_PREPROCESSOR_STR_HPP
diff --git a/sprout/preprocessor/str_all.hpp b/sprout/preprocessor/str_all.hpp
index f86ce43c..ab58b67e 100644
--- a/sprout/preprocessor/str_all.hpp
+++ b/sprout/preprocessor/str_all.hpp
@@ -9,6 +9,7 @@
 #define SPROUT_PREPROCESSOR_STR_ALL_HPP
 
 #include <sprout/config.hpp>
+#include <sprout/preprocessor/str.hpp>
 #include <sprout/preprocessor/wstr.hpp>
 #include <sprout/preprocessor/u16str.hpp>
 #include <sprout/preprocessor/u32str.hpp>
diff --git a/sprout/preprocessor/unique_string.hpp b/sprout/preprocessor/unique_string.hpp
index 341ce7f5..14305ea8 100644
--- a/sprout/preprocessor/unique_string.hpp
+++ b/sprout/preprocessor/unique_string.hpp
@@ -13,6 +13,29 @@
 #include <sprout/preprocessor/str_all.hpp>
 #include <sprout/preprocessor/some_number.hpp>
 
+//
+// SPROUT_PP_UNIQUE_STRING_
+// SPROUT_PP_UNIQUE_WSTRING_
+// SPROUT_PP_UNIQUE_U16STRING_
+// SPROUT_PP_UNIQUE_U32STRING_
+//
+#define SPROUT_PP_UNIQUE_STRING_(N) \
+	SPROUT_PP_STRINGIZE(N) SPROUT_PP_STR(" ") \
+	SPROUT_PP_STR(__DATE__) SPROUT_PP_STR(" ") SPROUT_PP_STR(__TIME__) \
+	SPROUT_PP_STR(" : ") SPROUT_PP_STR(__FILE__) SPROUT_PP_STR(":") SPROUT_PP_STRINGIZE(__LINE__)
+#define SPROUT_PP_UNIQUE_WSTRING_(N) \
+	SPROUT_PP_WSTRINGIZE(N) SPROUT_PP_WSTR(" ") \
+	SPROUT_PP_WSTR(__DATE__) SPROUT_PP_WSTR(" ") SPROUT_PP_WSTR(__TIME__) \
+	SPROUT_PP_WSTR(" : ") SPROUT_PP_WSTR(__FILE__) SPROUT_PP_WSTR(":") SPROUT_PP_WSTRINGIZE(__LINE__)
+#define SPROUT_PP_UNIQUE_U16STRING_(N) \
+	SPROUT_PP_U16STRINGIZE(N) SPROUT_PP_U16STR(" ") \
+	SPROUT_PP_U16STR(__DATE__) SPROUT_PP_U16STR(" ") SPROUT_PP_U16STR(__TIME__) \
+	SPROUT_PP_U16STR(" : ") SPROUT_PP_U16STR(__FILE__) SPROUT_PP_U16STR(":") SPROUT_PP_U16STRINGIZE(__LINE__)
+#define SPROUT_PP_UNIQUE_U32STRING_(N) \
+	SPROUT_PP_U32STRINGIZE(N) SPROUT_PP_U32STR(" ") \
+	SPROUT_PP_U32STR(__DATE__) SPROUT_PP_U32STR(" ") SPROUT_PP_U32STR(__TIME__) \
+	SPROUT_PP_U32STR(" : ") SPROUT_PP_U32STR(__FILE__) SPROUT_PP_U32STR(":") SPROUT_PP_U32STRINGIZE(__LINE__)
+
 //
 // SPROUT_PP_UNIQUE_STRING
 // SPROUT_PP_UNIQUE_WSTRING
@@ -20,20 +43,12 @@
 // SPROUT_PP_UNIQUE_U32STRING
 //
 #define SPROUT_PP_UNIQUE_STRING \
-	SPROUT_PP_STRINGIZE(SPROUT_PP_SOME_NUMBER()) " " \
-	__DATE__ " " __TIME__ \
-	" : " __FILE__ ":" SPROUT_PP_STRINGIZE(__LINE__)
+	SPROUT_PP_UNIQUE_STRING_(SPROUT_PP_SOME_NUMBER())
 #define SPROUT_PP_UNIQUE_WSTRING \
-	SPROUT_PP_WSTRINGIZE(SPROUT_PP_SOME_NUMBER()) SPROUT_PP_WSTR(" ") \
-	SPROUT_PP_WSTR(__DATE__) SPROUT_PP_WSTR(" ") SPROUT_PP_WSTR(__TIME__) \
-	SPROUT_PP_WSTR(" : ") SPROUT_PP_WSTR(__FILE__) SPROUT_PP_WSTR(":") SPROUT_PP_WSTRINGIZE(__LINE__)
+	SPROUT_PP_UNIQUE_WSTRING_(SPROUT_PP_SOME_NUMBER())
 #define SPROUT_PP_UNIQUE_U16STRING \
-	SPROUT_PP_U16STRINGIZE(SPROUT_PP_SOME_NUMBER()) SPROUT_PP_U16STR(" ") \
-	SPROUT_PP_U16STR(__DATE__) SPROUT_PP_U16STR(" ") SPROUT_PP_U16STR(__TIME__) \
-	SPROUT_PP_U16STR(" : ") SPROUT_PP_U16STR(__FILE__) SPROUT_PP_U16STR(":") SPROUT_PP_U16STRINGIZE(__LINE__)
+	SPROUT_PP_UNIQUE_U16STRING_(SPROUT_PP_SOME_NUMBER())
 #define SPROUT_PP_UNIQUE_U32STRING \
-	SPROUT_PP_U32STRINGIZE(SPROUT_PP_SOME_NUMBER()) SPROUT_PP_U32STR(" ") \
-	SPROUT_PP_U32STR(__DATE__) SPROUT_PP_U32STR(" ") SPROUT_PP_U32STR(__TIME__) \
-	SPROUT_PP_U32STR(" : ") SPROUT_PP_U32STR(__FILE__) SPROUT_PP_U32STR(":") SPROUT_PP_U32STRINGIZE(__LINE__)
+	SPROUT_PP_UNIQUE_U32STRING_(SPROUT_PP_SOME_NUMBER())
 
 #endif	// #ifndef SPROUT_PREPROCESSOR_UNIQUE_STRING_HPP
diff --git a/sprout/random/unique_seed.hpp b/sprout/random/unique_seed.hpp
index 0768f411..1fa533ec 100644
--- a/sprout/random/unique_seed.hpp
+++ b/sprout/random/unique_seed.hpp
@@ -54,10 +54,17 @@ namespace sprout {
 	}
 }	// namespace sprout
 
+//
+// SPROUT_UNIQUE_SEED_
+//
+#define SPROUT_UNIQUE_SEED_(N) \
+	(::sprout::make_seed(SPROUT_PP_UNIQUE_STRING_(N)))
+
 //
 // SPROUT_UNIQUE_SEED
 //
-#define SPROUT_UNIQUE_SEED (::sprout::make_seed(SPROUT_PP_UNIQUE_STRING))
+#define SPROUT_UNIQUE_SEED \
+	(::sprout::make_seed(SPROUT_PP_UNIQUE_STRING))
 
 //
 // SPROUT_UNIQUE_SEED_SEQ