// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
struct Trivial {};
struct NonTrivial {
NonTrivial(NonTrivial&&); // expected-note{{copy constructor is implicitly deleted}}
};
struct DeletedCopy {
DeletedCopy(const DeletedCopy&) = delete;
};
// A defaulted move constructor for a class X is defined as deleted if X has:
// -- a variant member with a non-trivial corresponding constructor
union DeletedNTVariant {
NonTrivial NT; // expected-note{{deleted because variant field 'NT' has a non-trivial move constructor}}
DeletedNTVariant(DeletedNTVariant&&);
};
DeletedNTVariant::DeletedNTVariant(DeletedNTVariant&&) = default; // expected-error{{would delete}}
struct DeletedNTVariant2 {
union {
NonTrivial NT; // expected-note{{deleted because variant field 'NT' has a non-trivial move constructor}}
};
DeletedNTVariant2(DeletedNTVariant2&&);
};
DeletedNTVariant2::DeletedNTVariant2(DeletedNTVariant2&&) = default; // expected-error{{would delete}}
// Note, move constructor is not a candidate because it is deleted.
template<typename T> struct DeletedNTVariant3 { // expected-note 2{{default}} expected-note 2{{copy}}
union {
T NT;
};
};
extern DeletedNTVariant3<NonTrivial> dntv3a(0); // expected-error {{no matching}}
extern DeletedNTVariant3<DeletedCopy> dntv3b(0); // expected-error {{no matching}}
// -- a non-static data member of class type M (or array thereof) that cannot be
// copied because overload resolution results in an ambiguity or a function
// that is deleted or inaccessible
struct NoAccess {
NoAccess() = default;
private:
NoAccess(NoAccess&&);
friend struct HasAccess;
};
struct HasNoAccess {
NoAccess NA; // expected-note{{deleted because field 'NA' has an inaccessible move constructor}}
HasNoAccess(HasNoAccess&&);
};
HasNoAccess::HasNoAccess(HasNoAccess&&) = default; // expected-error{{would delete}}
struct HasAccess {
NoAccess NA;
HasAccess(HasAccess&&);
};
HasAccess::HasAccess(HasAccess&&) = default;
struct Ambiguity {
Ambiguity(const Ambiguity&&);
Ambiguity(volatile Ambiguity&&);
};
struct IsAmbiguous {
Ambiguity A; // expected-note{{deleted because field 'A' has multiple move constructors}}
IsAmbiguous(IsAmbiguous&&); // expected-note{{copy constructor is implicitly deleted because 'IsAmbiguous' has a user-declared move constructor}}
};
IsAmbiguous::IsAmbiguous(IsAmbiguous&&) = default; // expected-error{{would delete}}
struct Deleted {
// FIXME: This diagnostic is slightly wrong: the constructor we select to move
// 'IA' is deleted, but we select the copy constructor (we ignore the move
// constructor, because it was defaulted and deleted).
IsAmbiguous IA; // expected-note{{deleted because field 'IA' has a deleted move constructor}}
Deleted(Deleted&&);
};
Deleted::Deleted(Deleted&&) = default; // expected-error{{would delete}}
// It's implied (but not stated) that this should also happen if overload
// resolution fails.
struct ConstMember {
const Trivial ct;
ConstMember(ConstMember&&);
};
ConstMember::ConstMember(ConstMember&&) = default; // ok, calls copy ctor
struct ConstMoveOnlyMember {
// FIXME: This diagnostic is slightly wrong: the constructor we select to move
// 'cnt' is deleted, but we select the copy constructor, because the object is
// const.
const NonTrivial cnt; // expected-note{{deleted because field 'cnt' has a deleted move constructor}}
ConstMoveOnlyMember(ConstMoveOnlyMember&&);
};
ConstMoveOnlyMember::ConstMoveOnlyMember(ConstMoveOnlyMember&&) = default; // expected-error{{would delete}}
struct VolatileMember {
volatile Trivial vt; // expected-note{{deleted because field 'vt' has no move constructor}}
VolatileMember(VolatileMember&&);
};
VolatileMember::VolatileMember(VolatileMember&&) = default; // expected-error{{would delete}}
// -- a direct or virtual base class B that cannot be moved because overload
// resolution results in an ambiguity or a function that is deleted or
// inaccessible
struct AmbiguousMoveBase : Ambiguity { // expected-note{{deleted because base class 'Ambiguity' has multiple move constructors}}
AmbiguousMoveBase(AmbiguousMoveBase&&); // expected-note{{copy constructor is implicitly deleted}}
};
AmbiguousMoveBase::AmbiguousMoveBase(AmbiguousMoveBase&&) = default; // expected-error{{would delete}}
struct DeletedMoveBase : AmbiguousMoveBase { // expected-note{{deleted because base class 'AmbiguousMoveBase' has a deleted move constructor}}
DeletedMoveBase(DeletedMoveBase&&);
};
DeletedMoveBase::DeletedMoveBase(DeletedMoveBase&&) = default; // expected-error{{would delete}}
struct InaccessibleMoveBase : NoAccess { // expected-note{{deleted because base class 'NoAccess' has an inaccessible move constructor}}
InaccessibleMoveBase(InaccessibleMoveBase&&);
};
InaccessibleMoveBase::InaccessibleMoveBase(InaccessibleMoveBase&&) = default; // expected-error{{would delete}}
// -- any direct or virtual base class or non-static data member of a type with
// a destructor that is deleted or inaccessible
struct NoAccessDtor {
NoAccessDtor(NoAccessDtor&&); // expected-note{{copy constructor is implicitly deleted because 'NoAccessDtor' has a user-declared move constructor}}
private:
~NoAccessDtor();
friend struct HasAccessDtor;
};
struct HasNoAccessDtor {
NoAccessDtor NAD; // expected-note {{deleted because field 'NAD' has an inaccessible destructor}}
HasNoAccessDtor(HasNoAccessDtor&&);
};
HasNoAccessDtor::HasNoAccessDtor(HasNoAccessDtor&&) = default; // expected-error{{would delete}}
struct HasAccessDtor {
NoAccessDtor NAD;
HasAccessDtor(HasAccessDtor&&);
};
HasAccessDtor::HasAccessDtor(HasAccessDtor&&) = default;
struct HasNoAccessDtorBase : NoAccessDtor { // expected-note{{copy constructor of 'HasNoAccessDtorBase' is implicitly deleted because base class 'NoAccessDtor' has a deleted copy constructor}}
};
extern HasNoAccessDtorBase HNADBa;
HasNoAccessDtorBase HNADBb(HNADBa); // expected-error{{implicitly-deleted copy constructor}}
// The restriction on rvalue reference members applies to only the copy
// constructor.
struct RValue {
int &&ri = 1;
RValue(RValue&&);
};
RValue::RValue(RValue&&) = default;
// -- a non-static data member or direct or virtual base class with a type that
// does not have a move constructor and is not trivially copyable
struct CopyOnly {
CopyOnly(const CopyOnly&);
};
struct NonMove {
CopyOnly CO;
NonMove(NonMove&&);
};
NonMove::NonMove(NonMove&&) = default; // ok under DR1402
struct Moveable {
Moveable();
Moveable(Moveable&&);
};
struct HasMove {
Moveable M;
HasMove(HasMove&&);
};
HasMove::HasMove(HasMove&&) = default;
namespace DR1402 {
struct member {
member();
member(const member&);
member& operator=(const member&);
~member();
};
struct A {
member m_;
A() = default;
A(const A&) = default;
A& operator=(const A&) = default;
A(A&&) = default;
A& operator=(A&&) = default;
~A() = default;
};
// ok, A's explicitly-defaulted move operations copy m_.
void f() {
A a, b(a), c(static_cast<A&&>(a));
a = b;
b = static_cast<A&&>(c);
}
}
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