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217 lines
9.4 KiB
217 lines
9.4 KiB
4 months ago
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// RUN: %clang_cc1 -std=c++11 -verify %s -Wno-defaulted-function-deleted
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// expected-no-diagnostics
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template<typename T, bool B> struct trivially_copyable_check {
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static_assert(B == __has_trivial_copy(T), "");
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static_assert(B == __is_trivially_constructible(T, T), "");
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static_assert(B == __is_trivially_constructible(T, const T &), "");
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static_assert(B == __is_trivially_constructible(T, T &&), "");
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typedef void type;
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};
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template<typename T> using trivially_copyable =
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typename trivially_copyable_check<T, true>::type;
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template<typename T> using not_trivially_copyable =
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typename trivially_copyable_check<T, false>::type;
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struct Trivial {};
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using _ = trivially_copyable<Trivial>;
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// A copy/move constructor for class X is trivial if it is not user-provided,
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struct UserProvided {
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UserProvided(const UserProvided &);
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};
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using _ = not_trivially_copyable<UserProvided>;
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// its declared parameter type is the same as if it had been implicitly
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// declared,
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struct NonConstCopy {
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NonConstCopy(NonConstCopy &) = default;
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};
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using _ = not_trivially_copyable<NonConstCopy>;
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// class X has no virtual functions
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struct VFn {
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virtual void f();
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};
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using _ = not_trivially_copyable<VFn>;
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// and no virtual base classes
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struct VBase : virtual Trivial {};
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using _ = not_trivially_copyable<VBase>;
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// and the constructor selected to copy/move each [direct subobject] is trivial
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struct TemplateCtor {
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template<typename T> TemplateCtor(T &);
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};
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using _ = trivially_copyable<TemplateCtor>;
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struct TemplateCtorMember {
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TemplateCtor tc;
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};
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using _ = trivially_copyable<TemplateCtorMember>;
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// We can select a non-trivial copy ctor even if there is a trivial one.
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struct MutableTemplateCtorMember {
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mutable TemplateCtor mtc;
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};
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static_assert(!__is_trivially_constructible(MutableTemplateCtorMember, const MutableTemplateCtorMember &), "");
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static_assert(__is_trivially_constructible(MutableTemplateCtorMember, MutableTemplateCtorMember &&), "");
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struct MutableTemplateCtorMember2 {
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MutableTemplateCtorMember2(const MutableTemplateCtorMember2 &) = default;
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MutableTemplateCtorMember2(MutableTemplateCtorMember2 &&) = default;
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mutable TemplateCtor mtc;
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};
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static_assert(!__is_trivially_constructible(MutableTemplateCtorMember2, const MutableTemplateCtorMember2 &), "");
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static_assert(__is_trivially_constructible(MutableTemplateCtorMember2, MutableTemplateCtorMember2 &&), "");
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// Both trivial and non-trivial special members.
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struct TNT {
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TNT(const TNT &) = default; // trivial
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TNT(TNT &); // non-trivial
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TNT(TNT &&) = default; // trivial
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TNT(const TNT &&); // non-trivial
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};
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static_assert(!__has_trivial_copy(TNT), "lie deliberately for gcc compatibility");
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static_assert(__is_trivially_constructible(TNT, TNT), "");
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static_assert(!__is_trivially_constructible(TNT, TNT &), "");
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static_assert(__is_trivially_constructible(TNT, const TNT &), "");
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static_assert(!__is_trivially_constructible(TNT, volatile TNT &), "");
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static_assert(__is_trivially_constructible(TNT, TNT &&), "");
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static_assert(!__is_trivially_constructible(TNT, const TNT &&), "");
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static_assert(!__is_trivially_constructible(TNT, volatile TNT &&), "");
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// This has only trivial special members.
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struct DerivedFromTNT : TNT {};
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static_assert(__has_trivial_copy(DerivedFromTNT), "");
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static_assert(__is_trivially_constructible(DerivedFromTNT, DerivedFromTNT), "");
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static_assert(__is_trivially_constructible(DerivedFromTNT, DerivedFromTNT &), "");
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static_assert(__is_trivially_constructible(DerivedFromTNT, const DerivedFromTNT &), "");
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static_assert(!__is_trivially_constructible(DerivedFromTNT, volatile DerivedFromTNT &), "");
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static_assert(__is_trivially_constructible(DerivedFromTNT, DerivedFromTNT &&), "");
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static_assert(__is_trivially_constructible(DerivedFromTNT, const DerivedFromTNT &&), "");
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static_assert(!__is_trivially_constructible(DerivedFromTNT, volatile DerivedFromTNT &&), "");
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// This has only trivial special members.
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struct TNTMember {
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TNT tnt;
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};
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static_assert(__has_trivial_copy(TNTMember), "");
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static_assert(__is_trivially_constructible(TNTMember, TNTMember), "");
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static_assert(__is_trivially_constructible(TNTMember, TNTMember &), "");
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static_assert(__is_trivially_constructible(TNTMember, const TNTMember &), "");
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static_assert(!__is_trivially_constructible(TNTMember, volatile TNTMember &), "");
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static_assert(__is_trivially_constructible(TNTMember, TNTMember &&), "");
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static_assert(__is_trivially_constructible(TNTMember, const TNTMember &&), "");
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static_assert(!__is_trivially_constructible(TNTMember, volatile TNTMember &&), "");
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struct NCCTNT : NonConstCopy, TNT {};
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static_assert(!__has_trivial_copy(NCCTNT), "");
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static_assert(!__is_trivially_constructible(NCCTNT, NCCTNT), "");
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static_assert(!__is_trivially_constructible(NCCTNT, NCCTNT &), "");
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static_assert(!__is_trivially_constructible(NCCTNT, const NCCTNT &), "");
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static_assert(!__is_trivially_constructible(NCCTNT, volatile NCCTNT &), "");
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static_assert(!__is_trivially_constructible(NCCTNT, NCCTNT &&), "");
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static_assert(!__is_trivially_constructible(NCCTNT, const NCCTNT &&), "");
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static_assert(!__is_trivially_constructible(NCCTNT, volatile NCCTNT &&), "");
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struct TemplateCtorNoMove {
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TemplateCtorNoMove(const TemplateCtorNoMove &) = default;
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template<typename T> TemplateCtorNoMove(T &&);
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};
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static_assert(__is_trivially_constructible(TemplateCtorNoMove, const TemplateCtorNoMove &), "");
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static_assert(!__is_trivially_constructible(TemplateCtorNoMove, TemplateCtorNoMove &&), "");
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struct UseTemplateCtorNoMove {
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TemplateCtorNoMove tcnm;
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};
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static_assert(__is_trivially_constructible(UseTemplateCtorNoMove, const UseTemplateCtorNoMove &), "");
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static_assert(!__is_trivially_constructible(UseTemplateCtorNoMove, UseTemplateCtorNoMove &&), "");
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struct TemplateCtorNoMoveSFINAE {
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TemplateCtorNoMoveSFINAE(const TemplateCtorNoMoveSFINAE &) = default;
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template<typename T, typename U = typename T::error> TemplateCtorNoMoveSFINAE(T &&);
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};
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static_assert(__is_trivially_constructible(TemplateCtorNoMoveSFINAE, const TemplateCtorNoMoveSFINAE &), "");
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static_assert(__is_trivially_constructible(TemplateCtorNoMoveSFINAE, TemplateCtorNoMoveSFINAE &&), "");
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struct UseTemplateCtorNoMoveSFINAE {
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TemplateCtorNoMoveSFINAE tcnm;
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};
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static_assert(__is_trivially_constructible(UseTemplateCtorNoMoveSFINAE, const UseTemplateCtorNoMoveSFINAE &), "");
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static_assert(__is_trivially_constructible(UseTemplateCtorNoMoveSFINAE, UseTemplateCtorNoMoveSFINAE &&), "");
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namespace TrivialityDependsOnImplicitDeletion {
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struct PrivateMove {
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PrivateMove(const PrivateMove &) = default;
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private:
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PrivateMove(PrivateMove &&);
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friend class Access;
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};
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static_assert(__is_trivially_constructible(PrivateMove, const PrivateMove &), "");
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static_assert(!__is_trivially_constructible(PrivateMove, PrivateMove &&), "");
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struct NoAccess {
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PrivateMove pm;
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// NoAccess's move is deleted, so moves of it use PrivateMove's copy ctor,
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// which is trivial.
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};
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static_assert(__is_trivially_constructible(NoAccess, const NoAccess &), "");
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static_assert(__is_trivially_constructible(NoAccess, NoAccess &&), "");
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struct TopNoAccess : NoAccess {};
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static_assert(__is_trivially_constructible(TopNoAccess, const TopNoAccess &), "");
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static_assert(__is_trivially_constructible(TopNoAccess, TopNoAccess &&), "");
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struct Access {
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PrivateMove pm;
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// NoAccess's move would *not* be deleted, so is *not* suppressed,
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// so moves of it use PrivateMove's move ctor, which is not trivial.
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};
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static_assert(__is_trivially_constructible(Access, const Access &), "");
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static_assert(!__is_trivially_constructible(Access, Access &&), "");
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struct TopAccess : Access {};
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static_assert(__is_trivially_constructible(TopAccess, const TopAccess &), "");
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static_assert(!__is_trivially_constructible(TopAccess, TopAccess &&), "");
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}
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namespace TrivialityDependsOnDestructor {
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class HasInaccessibleDestructor { ~HasInaccessibleDestructor() = default; };
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struct HasImplicitlyDeletedDestructor : HasInaccessibleDestructor {};
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struct HasImplicitlyDeletedCopyCtor : HasImplicitlyDeletedDestructor {
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HasImplicitlyDeletedCopyCtor() = default;
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template<typename T> HasImplicitlyDeletedCopyCtor(T &&);
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// Copy ctor is deleted but trivial.
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// Move ctor is suppressed.
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HasImplicitlyDeletedCopyCtor(const HasImplicitlyDeletedCopyCtor&) = default;
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HasImplicitlyDeletedCopyCtor(HasImplicitlyDeletedCopyCtor&&) = default;
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};
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struct Test : HasImplicitlyDeletedCopyCtor {
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Test(const Test&) = default;
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Test(Test&&) = default;
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};
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// Implicit copy ctor calls deleted trivial copy ctor.
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static_assert(__has_trivial_copy(Test), "");
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// This is false because the destructor is deleted.
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static_assert(!__is_trivially_constructible(Test, const Test &), "");
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// Implicit move ctor calls template ctor.
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static_assert(!__is_trivially_constructible(Test, Test &&), "");
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struct HasAccessibleDestructor { ~HasAccessibleDestructor() = default; };
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struct HasImplicitlyDefaultedDestructor : HasAccessibleDestructor {};
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struct HasImplicitlyDefaultedCopyCtor : HasImplicitlyDefaultedDestructor {
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template<typename T> HasImplicitlyDefaultedCopyCtor(T &&);
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// Copy ctor is trivial.
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// Move ctor is trivial.
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};
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struct Test2 : HasImplicitlyDefaultedCopyCtor {};
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// Implicit copy ctor calls trivial copy ctor.
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static_assert(__has_trivial_copy(Test2), "");
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static_assert(__is_trivially_constructible(Test2, const Test2 &), "");
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// Implicit move ctor calls trivial move ctor.
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static_assert(__is_trivially_constructible(Test2, Test2 &&), "");
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}
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