Fix a warning (#95)

59254410 · Victor Zverovich · ba17cca4 · 59254410
Commit 59254410 authored Feb 06, 2015 by Victor Zverovich
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format.cc format.cc +2 -1

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--- a/format.cc
+++ b/format.cc
@@ -625,7 +625,8 @@ void fmt::BasicWriter<Char>::write_str(
    if (*str_value)
      str_size = std::char_traits<StrChar>::length(str_value);
  }
-  if (spec.precision_ >= 0 && spec.precision_ < str_size)
+  std::size_t precision = spec.precision_;
+  if (spec.precision_ >= 0 && precision < str_size)
    str_size = spec.precision_;
  write_str(str_value, str_size, spec);
 }