并行算法应要求使用向前迭代器 #6
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C++11 中迭代器的值类型应使用 `std::iterator_traits<I>::value_type` 确定。
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目前示例中的并行
sum算法要求能多次遍历同一个序列，这要求迭代器有多趟保证。另外 C++11 中迭代器的值类型最好用
std::iterator_traits<I>::value_type确定。而且 C++11 版本中可能不应允许用户手动指定另一个返回类型。