1 files changed, 198 insertions, 0 deletions
diff --git a/src/array_fun.h b/src/array_fun.h
new file mode 100644
index 00000000..d9ac1c26
--- /dev/null
+++ b/src/array_fun.h
@@ -0,0 +1,198 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2006 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef _D_ARRAY_FUN_H_
+#define _D_ARRAY_FUN_H_
+
+#include <functional>
+
+template<typename T>
+class bit_negate:public std::unary_function<T, T> {
+public:
+  T operator()(const T& t) const
+  {
+    return ~t;
+  }
+};
+
+template<typename T>
+class bit_and:public std::binary_function<T, T, T> {
+public:
+  T operator()(const T& t1, const T& t2) const
+  {
+    return t1&t2;
+  }
+};
+
+template<typename R>
+class array_function_base {
+public:
+  virtual ~array_function_base() {}
+
+  virtual R operator[](std::size_t index) const = 0;
+
+  virtual array_function_base* clone() const = 0;
+};
+
+template<typename A, typename F>
+class array_unary_function:public array_function_base<typename F::result_type> {
+private:
+  A _a;
+  F _f;
+public:
+  array_unary_function(A a, F f):_a(a), _f(f) {}
+
+  virtual typename F::result_type operator[](std::size_t index) const
+  {
+    return _f(_a[index]);
+  }
+
+  virtual array_function_base<typename F::result_type>* clone() const
+  {
+    return new array_unary_function(*this);
+  }
+};
+
+template<typename A, typename B, typename F>
+class array_binary_function:public array_function_base<typename F::result_type>{
+private:
+  A _a;
+  B _b;
+  F _f;
+public:
+  array_binary_function(A a, B b, F f):_a(a), _b(b), _f(f) {}
+
+  virtual typename F::result_type operator[](std::size_t index) const
+  {
+    return _f(_a[index], _b[index]);
+  }
+
+  virtual array_function_base<typename F::result_type>* clone() const
+  {
+    return new array_binary_function(*this);
+  }
+};
+
+template<typename R>
+class array_fun {
+private:
+  array_function_base<R>* _p;
+public:
+  template<typename A, typename F>
+  array_fun(A a, F f):_p(new array_unary_function<A, F>(a, f)) {}
+
+  template<typename A, typename B, typename F>
+  array_fun(A a, B b, F f):_p(new array_binary_function<A, B, F>(a, b, f)) {}
+
+  array_fun(const array_fun& af):_p(af._p->clone()) {}
+
+  ~array_fun()
+  {
+    delete _p;
+  }
+
+  array_fun& operator=(const array_fun& af)
+  {
+    if(this != &af) {
+      delete _p;
+      _p = af._p->clone();
+    }
+    return *this;
+  }
+
+  R operator[](std::size_t index) const
+  {
+    return (*_p)[index];
+  }
+
+  typedef R result_type;
+};
+
+template<typename R, typename A>
+array_fun<R>
+array_negate(A a)
+{
+  return array_fun<R>(a, bit_negate<R>());
+}
+
+template<typename T>
+array_fun<T>
+array_negate(T* a)
+{
+  return array_fun<T>(a, bit_negate<T>());
+}
+
+template<typename A>
+array_fun<typename A::result_type>
+array_negate(A a)
+{
+  return array_fun<typename A::result_type>(a, bit_negate<typename A::result_type>());
+}
+
+template<typename R, typename A, typename B>
+array_fun<R>
+array_and(A a, B b)
+{
+  return array_fun<R>(a, b, bit_and<R>());
+}
+
+template<typename T>
+array_fun<T>
+array_and(T* a, T* b)
+{
+  return array_fun<T>(a, b, bit_and<T>());
+}
+
+template<typename T>
+array_fun<typename T::result_type>
+array_and(T a, T b)
+{
+  return array_fun<typename T::result_type>(a, b, bit_and<typename T::result_type>());
+}
+
+template<typename A, typename B>
+array_fun<typename A::result_type>
+array_and(A a, B b)
+{
+  return array_fun<typename A::result_type>(a, b, bit_and<typename A::result_type>());
+}
+
+template<typename A, typename B>
+array_fun<typename B::result_type>
+array_and(A a, B b)
+{
+  return array_fun<typename B::result_type>(a, b, bit_and<typename B::result_type>());
+}
+
+#endif // _D_ARRAY_FUN_H_