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format std::reference_wrapper #4163

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format std::reference_wrapper #4163

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11 changes: 11 additions & 0 deletions include/fmt/std.h
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
# include <complex>
# include <cstdlib>
# include <exception>
# include <functional>
# include <memory>
# include <thread>
# include <type_traits>
Expand Down Expand Up @@ -699,4 +700,14 @@ template <typename T, typename Char> struct formatter<std::complex<T>, Char> {
};

FMT_END_NAMESPACE

namespace std {

template <typename T>
constexpr auto format_as(std::reference_wrapper<T> ref) -> T& {
return ref.get();
}

} // namespace std

#endif // FMT_STD_H_
5 changes: 5 additions & 0 deletions test/std-test.cc
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Expand Up @@ -393,3 +393,8 @@ TEST(std_test, format_shared_ptr) {
EXPECT_EQ(fmt::format("{}", fmt::ptr(sp.get())),
fmt::format("{}", fmt::ptr(sp)));
}

TEST(std_test, format_reference_wrapper) {
int num = 35;
EXPECT_EQ("35", fmt::to_string(std::cref(num)));
}