diff options
| -rw-r--r-- | libcxx/include/algorithm | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm index 76f59f24024..459071f0984 100644 --- a/libcxx/include/algorithm +++ b/libcxx/include/algorithm @@ -1763,7 +1763,8 @@ typename enable_if __copy(_Tp* __first, _Tp* __last, _Up* __result) { const size_t __n = static_cast<size_t>(__last - __first); - _VSTD::memmove(__result, __first, __n * sizeof(_Up)); + if (__n > 0) + _VSTD::memmove(__result, __first, __n * sizeof(_Up)); return __result + __n; } @@ -1798,8 +1799,11 @@ typename enable_if __copy_backward(_Tp* __first, _Tp* __last, _Up* __result) { const size_t __n = static_cast<size_t>(__last - __first); - __result -= __n; - _VSTD::memmove(__result, __first, __n * sizeof(_Up)); + if (__n > 0) + { + __result -= __n; + _VSTD::memmove(__result, __first, __n * sizeof(_Up)); + } return __result; } @@ -1896,7 +1900,8 @@ typename enable_if __move(_Tp* __first, _Tp* __last, _Up* __result) { const size_t __n = static_cast<size_t>(__last - __first); - _VSTD::memmove(__result, __first, __n * sizeof(_Up)); + if (__n > 0) + _VSTD::memmove(__result, __first, __n * sizeof(_Up)); return __result + __n; } @@ -1931,8 +1936,11 @@ typename enable_if __move_backward(_Tp* __first, _Tp* __last, _Up* __result) { const size_t __n = static_cast<size_t>(__last - __first); - __result -= __n; - _VSTD::memmove(__result, __first, __n * sizeof(_Up)); + if (__n > 0) + { + __result -= __n; + _VSTD::memmove(__result, __first, __n * sizeof(_Up)); + } return __result; } |
