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libstdc++: Allow std::swap to find overload for std::exception_ptr

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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.
This commit is contained in:
Jonathan Wakely 2022-05-12 14:18:53 +01:00
parent c470f3ea86
commit c829b04bc3
2 changed files with 16 additions and 4 deletions
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1
libstdc++-v3/doc/doxygen/user.cfg.in
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@ -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

19
libstdc++-v3/libsupc++/exception_ptr.h
View File

@ -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>