feat update

3party/asyncplusplus/include/async++/range.h

@@ -0,0 +1,182 @@
+// Copyright (c) 2015 Amanieu d'Antras
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef ASYNCXX_H_
+# error "Do not include this header directly, include <async++.h> instead."
+#endif
+
+namespace async {
+
+// Range type representing a pair of iterators
+template<typename Iter>
+class range {
+	Iter iter_begin, iter_end;
+
+public:
+	range() = default;
+	range(Iter a, Iter b)
+		: iter_begin(a), iter_end(b) {}
+
+	Iter begin() const
+	{
+		return iter_begin;
+	}
+	Iter end() const
+	{
+		return iter_end;
+	}
+};
+
+// Construct a range from 2 iterators
+template<typename Iter>
+range<Iter> make_range(Iter begin, Iter end)
+{
+	return {begin, end};
+}
+
+// A range of integers
+template<typename T>
+class int_range {
+	T value_begin, value_end;
+
+	static_assert(std::is_integral<T>::value, "int_range can only be used with integral types");
+
+public:
+	class iterator {
+		T current;
+
+		explicit iterator(T a)
+			: current(a) {}
+		friend class int_range<T>;
+
+	public:
+		typedef T value_type;
+		typedef std::ptrdiff_t difference_type;
+		typedef iterator pointer;
+		typedef T reference;
+		typedef std::random_access_iterator_tag iterator_category;
+
+		iterator() = default;
+
+		T operator*() const
+		{
+			return current;
+		}
+		T operator[](difference_type offset) const
+		{
+			return current + offset;
+		}
+
+		iterator& operator++()
+		{
+			++current;
+			return *this;
+		}
+		iterator operator++(int)
+		{
+			return iterator(current++);
+		}
+		iterator& operator--()
+		{
+			--current;
+			return *this;
+		}
+		iterator operator--(int)
+		{
+			return iterator(current--);
+		}
+
+		iterator& operator+=(difference_type offset)
+		{
+			current += offset;
+			return *this;
+		}
+		iterator& operator-=(difference_type offset)
+		{
+			current -= offset;
+			return *this;
+		}
+
+		iterator operator+(difference_type offset) const
+		{
+			return iterator(current + offset);
+		}
+		iterator operator-(difference_type offset) const
+		{
+			return iterator(current - offset);
+		}
+
+		friend iterator operator+(difference_type offset, iterator other)
+		{
+			return other + offset;
+		}
+
+		friend difference_type operator-(iterator a, iterator b)
+		{
+			return a.current - b.current;
+		}
+
+		friend bool operator==(iterator a, iterator b)
+		{
+			return a.current == b.current;
+		}
+		friend bool operator!=(iterator a, iterator b)
+		{
+			return a.current != b.current;
+		}
+		friend bool operator>(iterator a, iterator b)
+		{
+			return a.current > b.current;
+		}
+		friend bool operator<(iterator a, iterator b)
+		{
+			return a.current < b.current;
+		}
+		friend bool operator>=(iterator a, iterator b)
+		{
+			return a.current >= b.current;
+		}
+		friend bool operator<=(iterator a, iterator b)
+		{
+			return a.current <= b.current;
+		}
+	};
+
+	int_range(T begin, T end)
+		: value_begin(begin), value_end(end) {}
+
+	iterator begin() const
+	{
+		return iterator(value_begin);
+	}
+	iterator end() const
+	{
+		return iterator(value_end);
+	}
+};
+
+// Construct an int_range between 2 values
+template<typename T, typename U>
+int_range<typename std::common_type<T, U>::type> irange(T begin, U end)
+{
+	return {begin, end};
+}
+
+} // namespace async