* [committed] libstdc++: Allow std::swap to find overload for std::exception_ptr
@ 2022-05-13 20:01 Jonathan Wakely
0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2022-05-13 20:01 UTC (permalink / raw)
To: libstdc++, gcc-patches
Tested powerpc64l4-linux, pushed to trunk.
-- >8 --
The non-member swap for std::exception_ptr is in a nested namespace and
so can only be found by ADL currently. Add a using-declaration so that
qualified std::swap calls will use the std::exception_ptr::swap member,
instead of the generic std::swap.
There's no new test for this, because the generic std::swap works, it
just does more work than is necessary.
Also tell Doxygen to replace the __exception_ptr namespace with
"__unspecified__" in the generate docs, so the real name is not
documented.
libstdc++-v3/ChangeLog:
* doc/doxygen/user.cfg.in (PREDEFINED): Replace __exception_ptr
with "__unspecified__".
* libsupc++/exception_ptr.h: Improve doxygen docs.
(__exception_ptr::swap): Also declare in namespace std.
---
libstdc++-v3/doc/doxygen/user.cfg.in | 1 +
libstdc++-v3/libsupc++/exception_ptr.h | 19 +++++++++++++++----
2 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index c034b864928..57270bdeb7a 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -2408,6 +2408,7 @@ PREDEFINED = __cplusplus=202002L \
_GLIBCXX_HAVE_BUILTIN_LAUNDER \
"_GLIBCXX_DOXYGEN_ONLY(X)=X " \
__allocator_base=std::__new_allocator \
+ __exception_ptr=__unspecified__ \
# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
# tag can be used to specify a list of macro names that should be expanded. The
diff --git a/libstdc++-v3/libsupc++/exception_ptr.h b/libstdc++-v3/libsupc++/exception_ptr.h
index 21c53f686ba..fd9ceec88d4 100644
--- a/libstdc++-v3/libsupc++/exception_ptr.h
+++ b/libstdc++-v3/libsupc++/exception_ptr.h
@@ -65,9 +65,12 @@ namespace std _GLIBCXX_VISIBILITY(default)
using __exception_ptr::exception_ptr;
- /** Obtain an exception_ptr to the currently handled exception. If there
- * is none, or the currently handled exception is foreign, return the null
- * value.
+ /** Obtain an exception_ptr to the currently handled exception.
+ *
+ * If there is none, or the currently handled exception is foreign,
+ * return the null value.
+ *
+ * @since C++11
*/
exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT;
@@ -79,10 +82,16 @@ namespace std _GLIBCXX_VISIBILITY(default)
namespace __exception_ptr
{
- using std::rethrow_exception;
+ using std::rethrow_exception; // So that ADL finds it.
/**
* @brief An opaque pointer to an arbitrary exception.
+ *
+ * The actual name of this type is unspecified, so the alias
+ * `std::exception_ptr` should be used to refer to it.
+ *
+ * @headerfile exception
+ * @since C++11 (but usable in C++98 as a GCC extension)
* @ingroup exceptions
*/
class exception_ptr
@@ -231,6 +240,8 @@ namespace std _GLIBCXX_VISIBILITY(default)
} // namespace __exception_ptr
+ using __exception_ptr::swap; // So that std::swap(exp1, exp2) finds it.
+
/// Obtain an exception_ptr pointing to a copy of the supplied object.
#if (__cplusplus >= 201103L && __cpp_rtti) || __cpp_exceptions
template<typename _Ex>
--
2.34.3
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