https://gcc.gnu.org/g:84c87d1f43091c2e537182d029db9739de518096
commit r15-1178-g84c87d1f43091c2e537182d029db9739de518096
Author: Jonathan Wakely <jwak...@redhat.com>
Date: Mon Jun 10 21:10:29 2024 +0100
libstdc++: Add test for chrono::leap_seconds ostream insertion
Also add a comment to the three-way comparison oeprator for
chrono::leap_seconds, noting the deviation from the spec (which is
functionally equivalent). What we implement is the originally proposed
resolution to LWG 3383, which should compile slightly more efficiently
than the final accepted resolution.
libstdc++-v3/ChangeLog:
* include/std/chrono (leap_seconds): Add comment.
* testsuite/std/time/leap_seconds/io.cc: New test.
Diff:
---
libstdc++-v3/include/std/chrono | 2 +
libstdc++-v3/testsuite/std/time/leap_seconds/io.cc | 56 ++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chrono
index b0aadf83b03..7ffa5360728 100644
--- a/libstdc++-v3/include/std/chrono
+++ b/libstdc++-v3/include/std/chrono
@@ -2925,6 +2925,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
const leap_second& __y) noexcept
{ return !(__x < __y.date()); }
+ // This is a simplified form of the constraint specified in the standard,
+ // three_way_comparable_with<sys_seconds, sys_time<_Duration>>.
template<three_way_comparable_with<seconds> _Duration>
[[nodiscard]] friend constexpr auto
operator<=>(const leap_second& __x,
diff --git a/libstdc++-v3/testsuite/std/time/leap_seconds/io.cc
b/libstdc++-v3/testsuite/std/time/leap_seconds/io.cc
new file mode 100644
index 00000000000..511fafdd1a0
--- /dev/null
+++ b/libstdc++-v3/testsuite/std/time/leap_seconds/io.cc
@@ -0,0 +1,56 @@
+// { dg-do run { target c++20 } }
+// { dg-require-effective-target tzdb }
+// { dg-require-effective-target cxx11_abi }
+
+#include <chrono>
+#include <sstream>
+#include <format>
+#include <testsuite_hooks.h>
+
+void
+test_output()
+{
+ using namespace std::chrono;
+
+ std::ostringstream out;
+ out << '\n';
+
+ for (auto& l : get_tzdb().leap_seconds)
+ if (l <= sys_days{2018y/March/17d})
+ out << l.date() << ": " << l.value() << '\n';
+
+ VERIFY( out.str() == R"(
+1972-07-01 00:00:00: 1s
+1973-01-01 00:00:00: 1s
+1974-01-01 00:00:00: 1s
+1975-01-01 00:00:00: 1s
+1976-01-01 00:00:00: 1s
+1977-01-01 00:00:00: 1s
+1978-01-01 00:00:00: 1s
+1979-01-01 00:00:00: 1s
+1980-01-01 00:00:00: 1s
+1981-07-01 00:00:00: 1s
+1982-07-01 00:00:00: 1s
+1983-07-01 00:00:00: 1s
+1985-07-01 00:00:00: 1s
+1988-01-01 00:00:00: 1s
+1990-01-01 00:00:00: 1s
+1991-01-01 00:00:00: 1s
+1992-07-01 00:00:00: 1s
+1993-07-01 00:00:00: 1s
+1994-07-01 00:00:00: 1s
+1996-01-01 00:00:00: 1s
+1997-07-01 00:00:00: 1s
+1999-01-01 00:00:00: 1s
+2006-01-01 00:00:00: 1s
+2009-01-01 00:00:00: 1s
+2012-07-01 00:00:00: 1s
+2015-07-01 00:00:00: 1s
+2017-01-01 00:00:00: 1s
+)" );
+}
+
+int main()
+{
+ test_output();
+}
