diff options
Diffstat (limited to 'libstdc++-v3/include/std/functional')
| -rw-r--r-- | libstdc++-v3/include/std/functional | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional index 7f6d8b6c4f6..b6cc6d5e072 100644 --- a/libstdc++-v3/include/std/functional +++ b/libstdc++-v3/include/std/functional @@ -1948,16 +1948,9 @@ namespace std */ void swap(function& __x) { - /* We cannot perform direct assignments of the _M_functor - parts as they are of type _Any_data and have a different - dynamic type. Doing so would violate type-based aliasing - rules and lead to spurious miscompilations. - Instead perform a bytewise exchange of the memory of - both POD objects. - ??? A wordwise exchange honoring alignment of _M_functor - would be more efficient. See PR42845. */ - for (unsigned i = 0; i < sizeof (_M_functor._M_pod_data); ++i) - std::swap (_M_functor._M_pod_data[i], __x._M_functor._M_pod_data[i]); + _Any_data __old_functor = _M_functor; + _M_functor = __x._M_functor; + __x._M_functor = __old_functor; _Manager_type __old_manager = _M_manager; _M_manager = __x._M_manager; __x._M_manager = __old_manager; |