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* [gcc r12-8266] libstdc++: Define std::hash<std::filesystem::path> (LWG 3657)
@ 2022-04-26 12:24 Jonathan Wakely
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From: Jonathan Wakely @ 2022-04-26 12:24 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:e3c5e8360b4e4799e1e2daf74282629248690f23
commit r12-8266-ge3c5e8360b4e4799e1e2daf74282629248690f23
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Apr 25 18:21:57 2022 +0100
libstdc++: Define std::hash<std::filesystem::path> (LWG 3657)
This DR was approved at the February 2022 plenary.
libstdc++-v3/ChangeLog:
* include/bits/fs_path.h (hash<filesystem::path>): Define.
* testsuite/27_io/filesystem/path/nonmember/hash_value.cc:
Check std::hash specialization.
Diff:
---
libstdc++-v3/include/bits/fs_path.h | 10 ++++++++++
.../testsuite/27_io/filesystem/path/nonmember/hash_value.cc | 10 ++++++++++
2 files changed, 20 insertions(+)
diff --git a/libstdc++-v3/include/bits/fs_path.h b/libstdc++-v3/include/bits/fs_path.h
index 9e06fa679d8..d6202fd275a 100644
--- a/libstdc++-v3/include/bits/fs_path.h
+++ b/libstdc++-v3/include/bits/fs_path.h
@@ -1416,6 +1416,16 @@ extern template class __shared_ptr<const filesystem::filesystem_error::_Impl>;
/// @endcond
+// _GLIBCXX_RESOLVE_LIB_DEFECTS
+// 3657. std::hash<std::filesystem::path> is not enabled
+template<>
+ struct hash<filesystem::path>
+ {
+ size_t
+ operator()(const filesystem::path& __p) const noexcept
+ { return filesystem::hash_value(__p); }
+ };
+
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc
index 6bc6296b5a8..0dcea6efc64 100644
--- a/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/nonmember/hash_value.cc
@@ -42,9 +42,19 @@ test02()
}
}
+void
+test03()
+{
+ std::hash<path> h;
+ // LWG 3657. std::hash<std::filesystem::path> is not enabled
+ for (const path p : __gnu_test::test_paths)
+ VERIFY( h(p) == hash_value(p) );
+}
+
int
main()
{
test01();
test02();
+ test03();
}
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