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完善forward_value的例子，添加std::forward的使用。 #6

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完善forward_value的例子，添加std::forward的使用。 #6

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@abinghu abinghu commented Sep 20, 2013

在move语义的那个例子中，给传递给process_value的参数i进行右值化处理，而使得process_value可以调用右值的版本。当然这里如果参数i是左值的，std::forward是不起任何作用的。

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