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Forward declare is_string<FILE*> specializations #1086

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Mar 19, 2019
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Forward declare is_string<FILE*> specializations #1086

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4 changes: 4 additions & 0 deletions include/fmt/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -618,6 +618,10 @@ struct is_string
decltype(to_string_view(declval<S>()))>::value> {
};

// Forward declare FILE* specialization defined in color.h
template <> struct is_string<std::FILE*>;
template <> struct is_string<const std::FILE*>;

template <typename S> struct char_t {
typedef decltype(to_string_view(declval<S>())) result;
typedef typename result::char_type type;
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