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Add formatter for std::atomic #3574

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merged 1 commit into from
Aug 14, 2023
Merged

Add formatter for std::atomic #3574

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14 changes: 13 additions & 1 deletion include/fmt/std.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
#ifndef FMT_STD_H_
#define FMT_STD_H_

#include <atomic>
#include <bitset>
#include <cstdlib>
#include <exception>
Expand Down Expand Up @@ -435,6 +436,17 @@ struct formatter<BitRef, Char,
}
};

FMT_END_NAMESPACE
FMT_EXPORT
template <typename T, typename Char>
struct formatter<std::atomic<T>, Char,
enable_if_t<is_formattable<T, Char>::value>>
: formatter<T, Char> {
template <typename FormatContext>
auto format(const std::atomic<T>& v, FormatContext& ctx) const
-> decltype(ctx.out()) {
return formatter<T, Char>::format(v.load(), ctx);
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Maybe its better to use load(std::memory_order_acquire) or even load(std::memory_order_relaxed)?

}
};

FMT_END_NAMESPACE
#endif // FMT_STD_H_
8 changes: 8 additions & 0 deletions test/std-test.cc
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Expand Up @@ -236,3 +236,11 @@ TEST(std_test, format_const_bit_reference) {
const std::vector<bool> v = {true, false};
EXPECT_EQ(fmt::format("{} {}", v[0], v[1]), "true false");
}

TEST(std_test, format_atomic) {
std::atomic<bool> b(false);
EXPECT_EQ(fmt::format("{}", b), "false");

const std::atomic<bool> cb(true);
EXPECT_EQ(fmt::format("{}", cb), "true");
}