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Use contiguous_range when available #4716

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Use contiguous_range when available #4716

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9 changes: 9 additions & 0 deletions include/fmt/base.h
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,10 @@
# define FMT_HAS_CPP_ATTRIBUTE(x) 0
#endif

#if FMT_HAS_INCLUDE(<ranges>)
# include <ranges>
#endif

#define FMT_HAS_CPP14_ATTRIBUTE(attribute) \
(FMT_CPLUSPLUS >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute))

Expand Down Expand Up @@ -588,7 +592,12 @@ template <typename T> class basic_appender;
using appender = basic_appender<char>;

// Checks whether T is a container with contiguous storage.
#if defined(__cpp_lib_ranges)
template <typename T>
struct is_contiguous : std::bool_constant<std::ranges::contiguous_range<T>> {};
#else
template <typename T> struct is_contiguous : std::false_type {};
#endif

class context;
template <typename OutputIt, typename Char> class generic_context;
Expand Down
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