Fix a link error in gcc8 (#1548)

24924128 · Victor Zverovich · c54cd718 · 24924128
Commit 24924128 authored Feb 07, 2020 by Victor Zverovich
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include/fmt/format.h include/fmt/format.h +1 -1

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--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -312,7 +312,7 @@ template <typename It> class is_output_iterator {
  using type = decltype(test<It>(typename iterator_category<It>::type{}));

 public:
-  static const bool value = !std::is_const<remove_reference_t<type>>::value;
+  enum { value = !std::is_const<remove_reference_t<type>>::value };
 };

 // A workaround for std::string not having mutable data() until C++17.