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Add formatter for std::atomic (#3574)

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This commit is contained in:
Zhanwei Wang
2023-08-14 23:34:31 +08:00
committed by GitHub
parent e150ea0cc2
commit 5a866fe852
2 changed files with 21 additions and 1 deletions
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14
include/fmt/std.h
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@ -8,6 +8,7 @@
#ifndef FMT_STD_H_ #ifndef FMT_STD_H_
#define FMT_STD_H_ #define FMT_STD_H_
#include <atomic>
#include <bitset> #include <bitset>
#include <cstdlib> #include <cstdlib>
#include <exception> #include <exception>
@ -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);
}
};
FMT_END_NAMESPACE
#endif // FMT_STD_H_ #endif // FMT_STD_H_

8
test/std-test.cc
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@ -236,3 +236,11 @@ TEST(std_test, format_const_bit_reference) {
const std::vector<bool> v = {true, false}; const std::vector<bool> v = {true, false};
EXPECT_EQ(fmt::format("{} {}", v[0], v[1]), "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");
}