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feat: add formatter for std::exception_ptr (#4808)

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Atlas-Zero 2026-06-18 21:54:42 +02:00 committed by Victor Zverovich
parent cd67635a19
commit 2ea74643a4
2 changed files with 39 additions and 0 deletions
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19
include/fmt/std.h
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@ -649,6 +649,25 @@ struct formatter<
}
};
template <> struct formatter<std::exception_ptr> : formatter<std::exception> {
template <typename FormatContext>
auto format(const std::exception_ptr& ex_ptr, FormatContext& ctx) const
-> decltype(ctx.out()) {
if (!ex_ptr) {
return detail::write(ctx.out(), string_view("nullptr"));
}
try {
std::rethrow_exception(ex_ptr);
} catch (const std::exception& e) {
// Reuses the base formatter<std::exception>::format behavior perfectly
return formatter<std::exception>::format(e, ctx);
} catch (...) {
return detail::write(ctx.out(), string_view("unknown exception"));
}
}
};
template <int N, typename Char>
struct formatter<detail::bitint<N>, Char> : formatter<long long, Char> {
static_assert(N <= 64, "unsupported _BitInt");

20
test/std-test.cc
View File

@ -404,6 +404,26 @@ TEST(std_test, exception) {
#endif
}
TEST(std_test, exception_ptr) {
std::exception_ptr p1 = nullptr;
std::exception_ptr p2;
try {
using namespace my_ns1::my_ns2;
throw my_exception("My Exception");
} catch (...) {
p2 = std::current_exception();
}
EXPECT_EQ(fmt::format("{}", p1), "nullptr");
EXPECT_EQ(fmt::format("{}", p2), "My Exception");
#if FMT_USE_RTTI
EXPECT_EQ(fmt::format("{:t}", p2),
"my_ns1::my_ns2::my_exception: My Exception");
#endif
}
#if FMT_USE_RTTI
TEST(std_test, type_info) {
EXPECT_EQ(fmt::format("{}", typeid(std::runtime_error)),