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After years of telling people: 'If you ever find any of my code that self-move-assigns, send me a bug report.' Somebody finally took me up on it. vector::erase(begin(), begin()) does a self-move-assign of every element in the vector, leaving all of those elements in an unspecified state. I checked the other containers for this same bug and did not find it. Added test case. 

llvm-svn: 179760
This commit is contained in:
Howard Hinnant 2013-04-18 15:02:57 +00:00
parent cf7c55ebcc
commit ab65a6f560
2 changed files with 9 additions and 1 deletions
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3
libcxx/include/vector
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@ -1615,7 +1615,8 @@ vector<_Tp, _Allocator>::erase(const_iterator __first, const_iterator __last)
_LIBCPP_ASSERT(__first <= __last, "vector::erase(first, last) called with invalid range");
pointer __p = this->__begin_ + (__first - begin());
iterator __r = __make_iter(__p);
this->__destruct_at_end(_VSTD::move(__p + (__last - __first), this->__end_, __p));
if (__first != __last)
this->__destruct_at_end(_VSTD::move(__p + (__last - __first), this->__end_, __p));
return __r;
}

7
libcxx/test/containers/sequences/vector/vector.modifiers/erase_iter_iter.pass.cpp
View File

@ -47,4 +47,11 @@ int main()
assert(distance(l1.cbegin(), l1.cend()) == 0);
assert(i == l1.begin());
}
{
std::vector<std::vector<int> > outer(2, std::vector<int>(1));
outer.erase(outer.begin(), outer.begin());
assert(outer.size() == 2);
assert(outer[0].size() == 1);
assert(outer[1].size() == 1);
}
}