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.

Fix the compilation error against G++ on Mac OS X.
72ce39de · Kaito Udagawa · d60945ac · 72ce39de
Commit 72ce39de authored Jun 13, 2015 by Kaito Udagawa
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sysinfo.cc src/sysinfo.cc +1 -1

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--- a/src/sysinfo.cc
+++ b/src/sysinfo.cc
@@ -267,7 +267,7 @@ void InitializeSystemInfo() {
  int num_cpus = 0;
  size_t size = sizeof(num_cpus);
  int numcpus_name[] = {CTL_HW, HW_NCPU};
-  if (::sysctl(numcpus_name, arraysize(numcpus_name), &num_cpus, &size, 0, 0) ==
+  if (::sysctl(numcpus_name, arraysize(numcpus_name), &num_cpus, &size, nullptr, 0) ==
          0 &&
      (size == sizeof(num_cpus)))
    cpuinfo_num_cpus = num_cpus;