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# a0839b14 31-Jul-2018 Louis Dionne <ldionne@apple.com>

[libc++] Fix tuple assignment from types derived from a tuple-like

The implementation of tuple's constructors and assignment operators
currently diverges from the way the Standard specifies them, wh

[libc++] Fix tuple assignment from types derived from a tuple-like

The implementation of tuple's constructors and assignment operators
currently diverges from the way the Standard specifies them, which leads
to subtle cases where the behavior is not as specified. In particular, a
class derived from a tuple-like type (e.g. pair) can't be assigned to a
tuple with corresponding members, when it should. This commit re-implements
the assignment operators (BUT NOT THE CONSTRUCTORS) in a way much closer
to the specification to get rid of this bug. Most of the tests have been
stolen from Eric's patch https://reviews.llvm.org/D27606.

As a fly-by improvement, tests for noexcept correctness have been added
to all overloads of operator=. We should tackle the same issue for the
tuple constructors in a future patch - I'm just trying to make progress
on fixing this long-standing bug.

PR17550
rdar://15837420

Differential Revision: https://reviews.llvm.org/D50106

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# 7cd166cd 14-Dec-2016 Eric Fiselier <eric@efcs.ca>

Work around bug in initialization of std::array base class with older clangs

llvm-svn: 289741
# f8136d08 14-Dec-2016 Eric Fiselier <eric@efcs.ca>

[libcxx] Fix tuple construction/assignment from types derived from tuple/pair/array.

Summary:
The standard requires tuple have the following constructors:
```
tuple(tuple<OtherTypes...> const&);
tup

[libcxx] Fix tuple construction/assignment from types derived from tuple/pair/array.

Summary:
The standard requires tuple have the following constructors:
```
tuple(tuple<OtherTypes...> const&);
tuple(tuple<OtherTypes...> &&);
tuple(pair<T1, T2> const&);
tuple(pair<T1, T2> &&);
tuple(array<T, N> const&);
tuple(array<T, N> &&);
```
However libc++ implements these as a single constructor with the signature:
```
template <class TupleLike, enable_if_t<__is_tuple_like<TupleLike>::value>>
tuple(TupleLike&&);
```

This causes the constructor to reject types derived from tuple-like types; Unlike if we had all of the concrete overloads, because they cause the derived->base conversion in the signature.

This patch fixes this issue by detecting derived types and the tuple-like base they are derived from. It does this by creating an overloaded function with signatures for each of tuple/pair/array and checking if the possibly derived type can convert to any of them.

This patch fixes [PR17550]( https://llvm.org/bugs/show_bug.cgi?id=17550)

This patch

Reviewers: mclow.lists, K-ballo, mpark, EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D27606

llvm-svn: 289727

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