https://bugs.llvm.org/show_bug.cgi?id=44540
Bug ID: 44540
Summary: Inheriting from vector of move-only type leads to copy
constructor being used
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: we...@wsoptics.de
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
The following code does not compile with clang + libstdc++:
#include <vector>
struct MoveOnly
{
MoveOnly() = default;
MoveOnly(MoveOnly const &) = delete;
MoveOnly(MoveOnly &&) = default;
MoveOnly & operator=(MoveOnly const &) = delete;
MoveOnly & operator=(MoveOnly &&) = default;
};
template <typename T>
class V : public std::vector<T>
{
using std::vector<T>::vector;
explicit V(std::vector<T> const & v) : std::vector<T>(v) {}
explicit V(std::vector<T> && v) : std::vector<T>(std::move(v)) {}
};
void f()
{
V<MoveOnly> v{};
}
It does however compile with gcc and also with clang + libc++. (But then again
not with MSVC.)
I think there's no reason for the copy constructor to be used here though.
See also
https://godbolt.org/z/m_G99y
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