[NFC][libc++][chrono] Removes dead code. #132104
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@llvm/pr-subscribers-libcxx Author: Mark de Wever (mordante) ChangesFor certain time_points there are specializations of __convert_to_tm. This means the non-specialized version is never called. This means some of the Since there is a Full diff: https://github.com/llvm/llvm-project/pull/132104.diff 1 Files Affected:
diff --git a/libcxx/include/__chrono/convert_to_tm.h b/libcxx/include/__chrono/convert_to_tm.h
index 0a6b627726091..23cb9b6518c86 100644
--- a/libcxx/include/__chrono/convert_to_tm.h
+++ b/libcxx/include/__chrono/convert_to_tm.h
@@ -143,21 +143,14 @@ _LIBCPP_HIDE_FROM_ABI _Tm __convert_to_tm(const _ChronoT& __value) {
# endif
if constexpr (__is_time_point<_ChronoT>) {
- if constexpr (same_as<typename _ChronoT::clock, chrono::system_clock>)
- return std::__convert_to_tm<_Tm>(__value);
-# if _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
-# if _LIBCPP_HAS_EXPERIMENTAL_TZDB
- else if constexpr (same_as<typename _ChronoT::clock, chrono::utc_clock>)
- return std::__convert_to_tm<_Tm>(__value);
- else if constexpr (same_as<typename _ChronoT::clock, chrono::tai_clock>)
- return std::__convert_to_tm<_Tm>(__value);
-# endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB
-# endif // _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
- else if constexpr (same_as<typename _ChronoT::clock, chrono::file_clock>)
+ if constexpr (same_as<typename _ChronoT::clock, chrono::file_clock>)
return std::__convert_to_tm<_Tm>(_ChronoT::clock::to_sys(__value));
else if constexpr (same_as<typename _ChronoT::clock, chrono::local_t>)
return std::__convert_to_tm<_Tm>(chrono::sys_time<typename _ChronoT::duration>{__value.time_since_epoch()});
else
+ // Note that some clocks have specializations __convert_to_tm for their
+ // time_point. These don't need to be added here. They do not trigger
+ // this assert.
static_assert(sizeof(_ChronoT) == 0, "TODO: Add the missing clock specialization");
} else if constexpr (chrono::__is_duration_v<_ChronoT>) {
// [time.format]/6
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✅ With the latest revision this PR passed the C/C++ code formatter. |
ldionne
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Mar 19, 2025
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| // Note that some clocks have specializations __convert_to_tm for their | ||
| // time_point. These don't need to be added here. They do not trigger | ||
| // this assert. |
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Let's use braces with the else -- the current layout is confusing.
For certain time_points there are specializations of __convert_to_tm. This means the non-specialized version is never called. This means some of the `if constexpr` will never be true. These are removed. Since there is a `static_assert` accidental removal of the specialization will make the code ill-formed.
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For certain time_points there are specializations of __convert_to_tm. This means the non-specialized version is never called. This means some of the
if constexprwill never be true. These are removed.Since there is a
static_assertaccidental removal of the specialization will make the code ill-formed.