70 lines · cpp
1// RUN: %clang_cc1 -std=c++1z -fexceptions %s -verify2 3using size_t = decltype(sizeof(0));4namespace std { enum class align_val_t : size_t {}; }5 6struct Arg {} arg;7 8// If the type is aligned, first try with an alignment argument and then9// without. If not, never consider supplying an alignment.10 11template<unsigned Align, typename ...Ts>12struct alignas(Align) Unaligned {13 void *operator new(size_t, Ts...) = delete; // expected-note 4{{deleted}}14};15auto *ua = new Unaligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__>; // expected-error {{deleted}}16auto *ub = new Unaligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2>; // expected-error {{deleted}}17auto *uap = new (arg) Unaligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__, Arg>; // expected-error {{deleted}}18auto *ubp = new (arg) Unaligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2, Arg>; // expected-error {{deleted}}19 20template<unsigned Align, typename ...Ts>21struct alignas(Align) Aligned {22 void *operator new(size_t, std::align_val_t, Ts...) = delete; // expected-note 2{{deleted}} expected-note 2{{not viable}}23};24auto *aa = new Aligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__>; // expected-error {{no matching}}25auto *ab = new Aligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2>; // expected-error {{deleted}}26auto *aap = new (arg) Aligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__, Arg>; // expected-error {{no matching}}27auto *abp = new (arg) Aligned<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2, Arg>; // expected-error {{deleted}}28 29// If both are available, we prefer the aligned version for an overaligned30// type, and only use the unaligned version for a non-overaligned type.31 32template<unsigned Align, typename ...Ts>33struct alignas(Align) Both1 {34 void *operator new(size_t, Ts...); // expected-note 2{{not viable}}35 void *operator new(size_t, std::align_val_t, Ts...) = delete; // expected-note 2{{deleted}}36};37template<unsigned Align, typename ...Ts>38struct alignas(Align) Both2 {39 void *operator new(size_t, Ts...) = delete; // expected-note 2{{deleted}}40 void *operator new(size_t, std::align_val_t, Ts...); // expected-note 2{{not viable}}41};42auto *b1a = new Both1<__STDCPP_DEFAULT_NEW_ALIGNMENT__>;43auto *b1b = new Both1<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2>; // expected-error {{deleted}}44auto *b2a = new Both2<__STDCPP_DEFAULT_NEW_ALIGNMENT__>; // expected-error {{deleted}}45auto *b2b = new Both2<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2>;46auto *b1ap = new (arg) Both1<__STDCPP_DEFAULT_NEW_ALIGNMENT__, Arg>;47auto *b1bp = new (arg) Both1<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2, Arg>; // expected-error {{deleted}}48auto *b2ap = new (arg) Both2<__STDCPP_DEFAULT_NEW_ALIGNMENT__, Arg>; // expected-error {{deleted}}49auto *b2bp = new (arg) Both2<__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2, Arg>;50 51// Note that the aligned form can select a function with a parameter different52// from std::align_val_t.53 54struct alignas(__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2) WeirdAlignedAlloc1 {55 void *operator new(size_t, ...) = delete; // expected-note 2{{deleted}}56};57auto *waa1 = new WeirdAlignedAlloc1; // expected-error {{deleted}}58auto *waa1p = new (arg) WeirdAlignedAlloc1; // expected-error {{deleted}}59 60struct alignas(__STDCPP_DEFAULT_NEW_ALIGNMENT__ * 2) WeirdAlignedAlloc2 {61 template<typename ...T>62 void *operator new(size_t, T...) {63 using U = void(T...); // expected-note 2{{previous}}64 using U = void; // expected-error {{different types ('void' vs 'void (std::align_val_t)')}} \65 expected-error {{different types ('void' vs 'void (std::align_val_t, Arg)')}}66 }67};68auto *waa2 = new WeirdAlignedAlloc2; // expected-note {{instantiation of}}69auto *waa2p = new (arg) WeirdAlignedAlloc2; // expected-note {{instantiation of}}70