xref: /llvm-project/clang/test/CXX/special/class.copy/p11.0x.copy.cpp (revision afe48f9d68e446829bed6ce72b319c915873809a)

// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s

struct Trivial {};
struct NonTrivial {
  NonTrivial(const NonTrivial&);
};

// A defaulted copy 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{{copy constructor of 'DeletedNTVariant' is implicitly deleted because variant field 'NT' has a non-trivial copy constructor}}
  DeletedNTVariant();
};
DeletedNTVariant DVa;
DeletedNTVariant DVb(DVa); // expected-error{{call to implicitly-deleted copy constructor}}

struct DeletedNTVariant2 {
  union {
    NonTrivial NT; // expected-note{{copy constructor of 'DeletedNTVariant2' is implicitly deleted because variant field 'NT' has a non-trivial copy constructor}}
  };
  DeletedNTVariant2();
};
DeletedNTVariant2 DV2a;
DeletedNTVariant2 DV2b(DV2a); // expected-error{{call to implicitly-deleted copy constructor}}

// -- 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(const NoAccess&);

  friend struct HasAccess;
};

struct HasNoAccess {
  NoAccess NA; // expected-note{{copy constructor of 'HasNoAccess' is implicitly deleted because field 'NA' has an inaccessible copy constructor}}
};
HasNoAccess HNAa;
HasNoAccess HNAb(HNAa); // expected-error{{call to implicitly-deleted copy constructor}}

struct HasAccess {
  NoAccess NA;
};

HasAccess HAa;
HasAccess HAb(HAa);

struct NonConst {
  NonConst(NonConst&);
};
struct Ambiguity {
  Ambiguity(const Ambiguity&);
  Ambiguity(volatile Ambiguity&);
};

struct IsAmbiguous {
  NonConst NC;
  Ambiguity A; // expected-note 2{{copy constructor of 'IsAmbiguous' is implicitly deleted because field 'A' has multiple copy constructors}}
  IsAmbiguous();
};
IsAmbiguous IAa;
IsAmbiguous IAb(IAa); // expected-error{{call to implicitly-deleted copy constructor}}

struct Deleted {
  IsAmbiguous IA; // expected-note{{copy constructor of 'Deleted' is implicitly deleted because field 'IA' has a deleted copy constructor}}
};
Deleted Da;
Deleted Db(Da); // expected-error{{call to implicitly-deleted copy constructor}}

// It's implied (but not stated) that this also applies in the case where
// overload resolution would fail.
struct VolatileMember {
  volatile Trivial vm; // expected-note {{has no copy}}
} vm1, vm2(vm1); // expected-error {{deleted}}

// -- a direct or virtual base class B that cannot be copied because overload
//    resolution results in an ambiguity or a function that is deleted or
//    inaccessible
struct AmbiguousCopyBase : Ambiguity { // expected-note 2{{copy constructor of 'AmbiguousCopyBase' is implicitly deleted because base class 'Ambiguity' has multiple copy constructors}}
  NonConst NC;
};
extern AmbiguousCopyBase ACBa;
AmbiguousCopyBase ACBb(ACBa); // expected-error {{deleted copy constructor}}

struct DeletedCopyBase : AmbiguousCopyBase {}; // expected-note {{copy constructor of 'DeletedCopyBase' is implicitly deleted because base class 'AmbiguousCopyBase' has a deleted copy constructor}}
extern DeletedCopyBase DCBa;
DeletedCopyBase DCBb(DCBa); // expected-error {{deleted copy constructor}}

struct InaccessibleCopyBase : NoAccess {}; // expected-note {{copy constructor of 'InaccessibleCopyBase' is implicitly deleted because base class 'NoAccess' has an inaccessible copy constructor}}
extern InaccessibleCopyBase ICBa;
InaccessibleCopyBase ICBb(ICBa); // expected-error {{deleted copy constructor}}

// -- any direct or virtual base class or non-static data member of a type with
//    a destructor that is deleted or inaccessible
struct NoAccessDtor {
private:
  ~NoAccessDtor();
  friend struct HasAccessDtor;
};

struct HasNoAccessDtor {
  NoAccessDtor NAD; // expected-note{{copy constructor of 'HasNoAccessDtor' is implicitly deleted because field 'NAD' has an inaccessible destructor}}
  HasNoAccessDtor();
  ~HasNoAccessDtor();
};
HasNoAccessDtor HNADa;
HasNoAccessDtor HNADb(HNADa); // expected-error{{call to implicitly-deleted copy constructor}}

struct HasAccessDtor {
  NoAccessDtor NAD;
};
HasAccessDtor HADa;
HasAccessDtor HADb(HADa);

struct HasNoAccessDtorBase : NoAccessDtor { // expected-note{{copy constructor of 'HasNoAccessDtorBase' is implicitly deleted because base class 'NoAccessDtor' has an inaccessible destructor}}
};
extern HasNoAccessDtorBase HNADBa;
HasNoAccessDtorBase HNADBb(HNADBa); // expected-error{{implicitly-deleted copy constructor}}

// -- a non-static data member of rvalue reference type
int some_int;
struct RValue {
  int && ri = static_cast<int&&>(some_int); // expected-note{{copy constructor of 'RValue' is implicitly deleted because field 'ri' is of rvalue reference type 'int &&'}}
};
RValue RVa;
RValue RVb(RVa); // expected-error{{call to implicitly-deleted copy constructor}}

// FIXME: The error on the class-name is attached to the location of the
// constructor. This is not especially clear.
struct RValueTmp { // expected-error {{reference member 'ri' binds to a temporary}}
  int && ri = 1; // expected-note{{copy constructor of 'RValueTmp' is implicitly deleted because field 'ri' is of rvalue reference type 'int &&'}} // expected-note {{default member init}}
};
RValueTmp RVTa; // expected-note {{implicit default constructor for 'RValueTmp' first required here}}
RValueTmp RVTb(RVTa); // expected-error{{call to implicitly-deleted copy constructor}}

namespace PR13381 {
  struct S {
    S(const S&);
    S(const volatile S&) = delete; // expected-note{{deleted here}}
  };
  struct T {
    volatile S s; // expected-note{{field 's' has a deleted copy constructor}}
  };
  T &f();
  T t = f(); // expected-error{{call to implicitly-deleted copy constructor}}
}

namespace Mutable {
  struct A {
    A(const A &);
    A(A &) = delete; // expected-note {{deleted here}}
  };

  struct B {
    A a;
    B(const B &);
  };
  B::B(const B &) = default;

  struct C {
    mutable A a; // expected-note {{deleted because field 'a' has a deleted copy constructor}}
    C(const C &);
  };
  C::C(const C &) = default; // expected-error{{would delete}}
}