+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+ /**
+ * @brief Create a range of sequentially increasing values.
+ *
+ * For each element in the range @p [first,last) assigns @p value and
+ * increments @p value as if by @p ++value.
+ *
+ * @param first Start of range.
+ * @param last End of range.
+ * @param value Starting value.
+ * @return Nothing.
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ void
+ iota(_ForwardIterator __first, _ForwardIterator __last, _Tp __value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_ConvertibleConcept<_Tp,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for (; __first != __last; ++__first)
+ {
+ *__first = __value;
+ ++__value;
+ }
+ }
+
+_GLIBCXX_END_NAMESPACE
+
+#endif
+
+_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
+
+ /**
+ * @brief Accumulate values in a range.
+ *
+ * Accumulates the values in the range [first,last) using operator+(). The
+ * initial value is @a init. The values are processed in order.
+ *
+ * @param first Start of range.
+ * @param last End of range.
+ * @param init Starting value to add other values to.
+ * @return The final sum.
+ */