Is this expression an xvalue? Languages

Is this expression an xvalue?

The C++ standard says the following about 'xvalues' (N4762 § 7.2.1.4): An expression is an xvalue if it is: - . . . - a class member access expression designating a non-static data member of non-reference type in which the object expression is an xvalue
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How to quickly delete millions of files Languages

How to quickly delete millions of files

We use BOOST1.63 boost::filesystem::remove_all(dir_to_remove) to remove a folder that has millions of files (each file has size of 1MB). The folder "dir_to_remove" has sub-folders, and each sub-folder has no more than 1000 files. It takes more than 10-min to delete all files. We use CentOS6.5.
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