diff --git a/README b/README
index 99d7c59e..0439b280 100644
--- a/README
+++ b/README
@@ -30,12 +30,14 @@ constexpr バリアント (Variants)
 constexpr アルゴリズム (Algorithms)
     sprout/algorithm.hpp
     sprout/numeric.hpp
-    sprout/numeric/dft.hpp
 
 constexpr 範囲アルゴリズム (Range algorithms)
     sprout/range/algorithm.hpp
     sprout/range/numeric.hpp
 
+constexpr Rangeアダプタ (Range adaptors)
+    sprout/range/adaptor.hpp
+
 constexpr コンテナ操作 (Container operations)
     sprout/operation.hpp
 
@@ -63,6 +65,10 @@ constexpr UUID (UUID)
 コンテナ特性 (Container traits)
     sprout/container.hpp
 
+constexpr 離散フーリエ変換 (Discrete Fourier transforms)
+    sprout/numeric/dft.hpp
+    sprout/range/numeric/dft.hpp
+
 constexpr 構文解析 (Parsing)
     sprout/weed.hpp
 
@@ -141,4 +147,5 @@ Mail: contact-lib@boleros.x0.com
 このライブラリは Boost Software License の元で公開されています。
 
 Copyright (C) 2011-2012 Bolero MURAKAMI.
-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)
+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)
diff --git a/sprout/range/numeric/dft.hpp b/sprout/range/numeric/dft.hpp
new file mode 100644
index 00000000..09605168
--- /dev/null
+++ b/sprout/range/numeric/dft.hpp
@@ -0,0 +1,9 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/range/numeric/dft/dft.hpp>
+#include <sprout/range/numeric/dft/idft.hpp>
+#include <sprout/range/numeric/dft/spectrum.hpp>
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_HPP
diff --git a/sprout/range/numeric/dft/dft.hpp b/sprout/range/numeric/dft/dft.hpp
new file mode 100644
index 00000000..9a7335e5
--- /dev/null
+++ b/sprout/range/numeric/dft/dft.hpp
@@ -0,0 +1,8 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_DFT_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_DFT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/range/numeric/dft/fixed/dft.hpp>
+#include <sprout/range/numeric/dft/fit/dft.hpp>
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_DFT_HPP
diff --git a/sprout/range/numeric/dft/fit/dft.hpp b/sprout/range/numeric/dft/fit/dft.hpp
new file mode 100644
index 00000000..fae3cc03
--- /dev/null
+++ b/sprout/range/numeric/dft/fit/dft.hpp
@@ -0,0 +1,28 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_FIT_DFT_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_FIT_DFT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/algorithm/fit/result_of.hpp>
+#include <sprout/numeric/dft/fit/dft.hpp>
+
+namespace sprout {
+	namespace range {
+		namespace fit {
+			//
+			// dft
+			//
+			template<typename Input, typename Result>
+			inline SPROUT_CONSTEXPR typename sprout::fit::result_of::algorithm<Result>::type dft(
+				Input const& input,
+				Result const& result
+				)
+			{
+				return sprout::fit::dft(sprout::begin(input), sprout::end(input), result);
+			}
+		}	// namespace fit
+	}	// namespace range
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_FIT_DFT_HPP
diff --git a/sprout/range/numeric/dft/fit/idft.hpp b/sprout/range/numeric/dft/fit/idft.hpp
new file mode 100644
index 00000000..82fc1b57
--- /dev/null
+++ b/sprout/range/numeric/dft/fit/idft.hpp
@@ -0,0 +1,28 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_FIT_IDFT_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_FIT_IDFT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/algorithm/fit/result_of.hpp>
+#include <sprout/numeric/dft/fit/idft.hpp>
+
+namespace sprout {
+	namespace range {
+		namespace fit {
+			//
+			// idft
+			//
+			template<typename Input, typename Result>
+			inline SPROUT_CONSTEXPR typename sprout::fit::result_of::algorithm<Result>::type idft(
+				Input const& input,
+				Result const& result
+				)
+			{
+				return sprout::fit::idft(sprout::begin(input), sprout::end(input), result);
+			}
+		}	// namespace fit
+	}	// namespace range
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_FIT_IDFT_HPP
diff --git a/sprout/range/numeric/dft/fit/spectrum.hpp b/sprout/range/numeric/dft/fit/spectrum.hpp
new file mode 100644
index 00000000..b4c7a13f
--- /dev/null
+++ b/sprout/range/numeric/dft/fit/spectrum.hpp
@@ -0,0 +1,28 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_FIT_SPECTRUM_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_FIT_SPECTRUM_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/algorithm/fit/result_of.hpp>
+#include <sprout/numeric/dft/fit/spectrum.hpp>
+
+namespace sprout {
+	namespace range {
+		namespace fit {
+			//
+			// spectrum
+			//
+			template<typename Input, typename Result>
+			inline SPROUT_CONSTEXPR typename sprout::fit::result_of::algorithm<Result>::type spectrum(
+				Input const& input,
+				Result const& result
+				)
+			{
+				return sprout::fit::spectrum(sprout::begin(input), sprout::end(input), result);
+			}
+		}	// namespace fit
+	}	// namespace range
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_FIT_SPECTRUM_HPP
diff --git a/sprout/range/numeric/dft/fixed/dft.hpp b/sprout/range/numeric/dft/fixed/dft.hpp
new file mode 100644
index 00000000..f0fe5f01
--- /dev/null
+++ b/sprout/range/numeric/dft/fixed/dft.hpp
@@ -0,0 +1,31 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_FIXED_DFT_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_FIXED_DFT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/algorithm/fixed/result_of.hpp>
+#include <sprout/numeric/dft/fixed/dft.hpp>
+
+namespace sprout {
+	namespace range {
+		namespace fixed {
+			//
+			// dft
+			//
+			template<typename Input, typename Result>
+			inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::algorithm<Result>::type
+			dft(
+				Input const& input,
+				Result const& result
+				)
+			{
+				return sprout::fixed::dft(sprout::begin(input), sprout::end(input), result);
+			}
+		}	// namespace fixed
+
+		using sprout::range::fixed::dft;
+	}	// namespace range
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_FIXED_DFT_HPP
diff --git a/sprout/range/numeric/dft/fixed/idft.hpp b/sprout/range/numeric/dft/fixed/idft.hpp
new file mode 100644
index 00000000..23762370
--- /dev/null
+++ b/sprout/range/numeric/dft/fixed/idft.hpp
@@ -0,0 +1,31 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_FIXED_IDFT_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_FIXED_IDFT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/algorithm/fixed/result_of.hpp>
+#include <sprout/numeric/dft/fixed/idft.hpp>
+
+namespace sprout {
+	namespace range {
+		namespace fixed {
+			//
+			// idft
+			//
+			template<typename Input, typename Result>
+			inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::algorithm<Result>::type
+			idft(
+				Input const& input,
+				Result const& result
+				)
+			{
+				return sprout::fixed::idft(sprout::begin(input), sprout::end(input), result);
+			}
+		}	// namespace fixed
+
+		using sprout::range::fixed::idft;
+	}	// namespace range
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_FIXED_IDFT_HPP
diff --git a/sprout/range/numeric/dft/fixed/spectrum.hpp b/sprout/range/numeric/dft/fixed/spectrum.hpp
new file mode 100644
index 00000000..5b9beec3
--- /dev/null
+++ b/sprout/range/numeric/dft/fixed/spectrum.hpp
@@ -0,0 +1,31 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_FIXED_SPECTRUM_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_FIXED_SPECTRUM_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/container/traits.hpp>
+#include <sprout/container/functions.hpp>
+#include <sprout/algorithm/fixed/result_of.hpp>
+#include <sprout/numeric/dft/fixed/spectrum.hpp>
+
+namespace sprout {
+	namespace range {
+		namespace fixed {
+			//
+			// spectrum
+			//
+			template<typename Input, typename Result>
+			inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::algorithm<Result>::type
+			spectrum(
+				Input const& input,
+				Result const& result
+				)
+			{
+				return sprout::fixed::spectrum(sprout::begin(input), sprout::end(input), result);
+			}
+		}	// namespace fixed
+
+		using sprout::range::fixed::spectrum;
+	}	// namespace range
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_FIXED_SPECTRUM_HPP
diff --git a/sprout/range/numeric/dft/idft.hpp b/sprout/range/numeric/dft/idft.hpp
new file mode 100644
index 00000000..68c5f4b7
--- /dev/null
+++ b/sprout/range/numeric/dft/idft.hpp
@@ -0,0 +1,8 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_IDFT_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_IDFT_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/range/numeric/dft/fixed/idft.hpp>
+#include <sprout/range/numeric/dft/fit/idft.hpp>
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_IDFT_HPP
diff --git a/sprout/range/numeric/dft/spectrum.hpp b/sprout/range/numeric/dft/spectrum.hpp
new file mode 100644
index 00000000..84692397
--- /dev/null
+++ b/sprout/range/numeric/dft/spectrum.hpp
@@ -0,0 +1,8 @@
+#ifndef SPROUT_RANGE_NUMERIC_DFT_SPECTRUM_HPP
+#define SPROUT_RANGE_NUMERIC_DFT_SPECTRUM_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/range/numeric/dft/fixed/spectrum.hpp>
+#include <sprout/range/numeric/dft/fit/spectrum.hpp>
+
+#endif	// #ifndef SPROUT_RANGE_NUMERIC_DFT_SPECTRUM_HPP