tree 63f2d70bc957673decf9fe7c30d093a8eec8377f
parent d60945ac432c5e981f4bcfaeb27891ef3b50e10b
author Kaito Udagawa <umireon@gmail.com> 1434191660 +0900
committer Kaito Udagawa <umireon@gmail.com> 1434191660 +0900

Fix the compilation error against G++ on Mac OS X.

Using `0` as a null pointer is illegal when `-Wzero-as-null-pointer-constant`
is given to G++.  To avoid the warning `zero-as-null-pointer-constant`,
`nullptr` (C++11 keyword) instead of `0` is used in the `sysctl` invocation.