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175 lines
9.3 KiB
C++
175 lines
9.3 KiB
C++
// RUN: %clang_cc1 -std=c++17 -verify=cxx17,expected %s
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// RUN: %clang_cc1 -std=c++17 -verify=cxx17,expected %s -DNO_CONSTEXPR
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// RUN: %clang_cc1 -std=c++20 -verify=cxx20,expected %s
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//
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// RUN: %clang_cc1 -std=c++17 -verify=cxx17,expected %s -fexperimental-new-constant-interpreter -DNEW_INTERP
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// RUN: %clang_cc1 -std=c++17 -verify=cxx17,expected %s -fexperimental-new-constant-interpreter -DNEW_INTERP -DNO_CONSTEXPR
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// RUN: %clang_cc1 -std=c++20 -verify=cxx20,expected %s -fexperimental-new-constant-interpreter -DNEW_INTERP
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namespace std {
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#ifndef NO_CONSTEXPR
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#define CONSTEXPR constexpr
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#else
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#define CONSTEXPR
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#endif
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template<typename T> CONSTEXPR T &&move(T &x) {
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static_assert(T::moveable, "instantiated move"); // expected-error {{no member named 'moveable' in 'B'}}
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// expected-error@-1 {{no member named 'moveable' in 'C'}}
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// expected-error@-2 {{no member named 'moveable' in 'D'}}
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return static_cast<T&&>(x);
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}
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// Unrelated move functions are not the builtin.
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template<typename T> CONSTEXPR int move(T, T) { return 5; }
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template<typename T, bool Rref> struct ref { using type = T&; };
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template<typename T> struct ref<T, true> { using type = T&&; };
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template<typename T> CONSTEXPR auto move_if_noexcept(T &x) -> typename ref<T, noexcept(T(static_cast<T&&>(x)))>::type {
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static_assert(T::moveable, "instantiated move_if_noexcept"); // expected-error {{no member named 'moveable' in 'B'}}
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// expected-error@-1 {{no member named 'moveable' in 'D'}}
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return static_cast<typename ref<T, noexcept(T(static_cast<T&&>(x)))>::type>(x);
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}
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template<typename T> struct remove_reference { using type = T; };
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template<typename T> struct remove_reference<T&> { using type = T; };
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template<typename T> struct remove_reference<T&&> { using type = T; };
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template<typename T> struct is_lvalue_reference { static constexpr bool value = false; };
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template<typename T> struct is_lvalue_reference<T&> { static constexpr bool value = true; };
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template<typename T> CONSTEXPR T &&forward(typename remove_reference<T>::type &x) {
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static_assert(T::moveable, "instantiated forward"); // expected-error {{no member named 'moveable' in 'B'}}
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// expected-error@-1 {{no member named 'moveable' in 'C'}}
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// expected-error@-2 {{no member named 'moveable' in 'D'}}
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return static_cast<T&&>(x);
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}
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template<typename T> CONSTEXPR T &&forward(typename remove_reference<T>::type &&x) {
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static_assert(!is_lvalue_reference<T>::value, "should not forward rval as lval"); // expected-error {{static assertion failed}}
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return static_cast<T&&>(x);
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}
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template <class T> struct is_const { static constexpr bool value = false; };
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template <class T> struct is_const<const T> { static constexpr bool value = true; };
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template <bool B, class T, class F> struct conditional { using type = T; };
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template <class T, class F> struct conditional<false, T, F> { using type = F; };
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template <class U, class T>
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using CopyConst = typename conditional<
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is_const<remove_reference<U>>::value,
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const T, T>::type;
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template <class U, class T>
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using OverrideRef = typename conditional<
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is_lvalue_reference<U &&>::value,
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typename remove_reference<T>::type &,
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typename remove_reference<T>::type &&>::type;
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template <class U, class T>
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using ForwardLikeRetType = OverrideRef<U &&, CopyConst<U, T>>;
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template <class U, class T>
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CONSTEXPR auto forward_like(T &&t) -> ForwardLikeRetType<U, T> {
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using TT = typename remove_reference<T>::type;
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static_assert(TT::moveable, "instantiated as_const"); // expected-error {{no member named 'moveable' in 'B'}}
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// expected-error@-1 {{no member named 'moveable' in 'D'}}
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return static_cast<ForwardLikeRetType<U, T>>(t);
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}
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template<typename T> CONSTEXPR const T &as_const(T &x) {
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static_assert(T::moveable, "instantiated as_const"); // expected-error {{no member named 'moveable' in 'B'}}
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// expected-error@-1 {{no member named 'moveable' in 'D'}}
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return x;
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}
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template<typename T> CONSTEXPR T *addressof(T &x) {
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static_assert(T::moveable, "instantiated addressof"); // expected-error {{no member named 'moveable' in 'B'}}
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// expected-error@-1 {{no member named 'moveable' in 'D'}}
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return __builtin_addressof(x);
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}
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template<typename T> CONSTEXPR T *__addressof(T &x) {
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static_assert(T::moveable, "instantiated __addressof"); // expected-error {{no member named 'moveable' in 'B'}}
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// expected-error@-1 {{no member named 'moveable' in 'D'}}
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return __builtin_addressof(x);
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}
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}
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// Note: this doesn't have a 'moveable' member. Instantiation of the above
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// functions will fail if it's attempted.
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struct A {};
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constexpr bool f(A a) { // #f
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A &&move = std::move(a); // #call
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A &&move_if_noexcept = std::move_if_noexcept(a);
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A &&forward1 = std::forward<A>(a);
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A &forward2 = std::forward<A&>(a);
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const A &as_const = std::as_const(a);
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A *addressof = std::addressof(a);
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A *addressof2 = std::__addressof(a);
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return &move == &a && &move_if_noexcept == &a &&
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&forward1 == &a && &forward2 == &a &&
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&as_const == &a && addressof == &a &&
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addressof2 == &a && std::move(a, a) == 5;
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}
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#ifndef NO_CONSTEXPR
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static_assert(f({}), "should be constexpr");
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#elif !defined(NEW_INTERP)
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// expected-error@#f {{never produces a constant expression}}
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// expected-note@#call {{}}
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#endif
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A &forward_rval_as_lval() {
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std::forward<A&&>(A()); // expected-warning {{const attribute}}
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return std::forward<A&>(A()); // expected-note {{instantiation of}} expected-warning {{returning reference}}
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}
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struct B {};
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B &&(*pMove)(B&) = std::move; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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B &&(*pMoveIfNoexcept)(B&) = &std::move_if_noexcept; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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B &&(*pForward)(B&) = &std::forward<B>; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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B &&(*pForwardLike)(B&) = &std::forward_like<int&&, B&>; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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const B &(*pAsConst)(B&) = &std::as_const; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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B *(*pAddressof)(B&) = &std::addressof; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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B *(*pUnderUnderAddressof)(B&) = &std::__addressof; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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int (*pUnrelatedMove)(B, B) = std::move;
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struct C {};
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C &&(&rMove)(C&) = std::move; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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C &&(&rForward)(C&) = std::forward<C>; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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int (&rUnrelatedMove)(B, B) = std::move;
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void attribute_const() {
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int n;
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std::move(n); // expected-warning {{ignoring return value}}
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std::move_if_noexcept(n); // expected-warning {{ignoring return value}}
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std::forward<int>(n); // expected-warning {{ignoring return value}}
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std::forward_like<float&&>(n); // expected-warning {{ignoring return value}}
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std::addressof(n); // expected-warning {{ignoring return value}}
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std::__addressof(n); // expected-warning {{ignoring return value}}
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std::as_const(n); // expected-warning {{ignoring return value}}
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}
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struct D {
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void* operator new(__SIZE_TYPE__, D&&(*)(D&));
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void* operator new(__SIZE_TYPE__, D*(*)(D&));
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void* operator new(__SIZE_TYPE__, const D&(*)(D&));
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};
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void placement_new() {
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new (std::move<D>) D; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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new (std::move_if_noexcept<D>) D; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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new (std::forward<D>) D; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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new (std::forward_like<D>) D; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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new (std::addressof<D>) D; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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new (std::__addressof<D>) D; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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new (std::as_const<D>) D; // cxx17-warning {{non-addressable}} cxx20-error {{non-addressable}} expected-note {{instantiation of}}
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}
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namespace std {
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template<typename T> int &move(T);
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}
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int bad_signature = std::move(0); // expected-error {{unsupported signature for 'std::move<int>'}}
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