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451 lines
19 KiB
451 lines
19 KiB
// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++17 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
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__extension__ typedef __SIZE_TYPE__ size_t;
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namespace std {
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template<typename T> struct initializer_list {
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const T *ptr;
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size_t n;
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initializer_list(const T*, size_t);
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};
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}
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namespace dr1310 { // dr1310: 5
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struct S {} * sp = new S::S; // expected-error {{qualified reference to 'S' is a constructor name}}
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void f() {
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S::S(a); // expected-error {{qualified reference to 'S' is a constructor name}}
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}
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struct T { int n; typedef int U; typedef T V; };
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int k = T().T::T::n;
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T::V v;
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struct U { int U; };
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int u = U().U::U;
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struct U::U w;
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struct V : T::T {
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// FIXME: This is technically ill-formed, but we consider that to be a defect.
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V() : T::T() {}
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};
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template<typename T> struct VT : T::T {
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VT() : T::T() {}
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};
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template struct VT<T>;
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template<template<typename> class> class TT {};
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template<typename> class TTy {};
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template<typename T> struct WBase {};
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template<typename T> struct W : WBase<T> { typedef int X; int n; };
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void w_test() {
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W<int>::W w1a; // expected-error {{qualified reference to 'W' is a constructor name}}
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W<int>::W::X w1ax;
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W<int>::W<int> w1b; // expected-error {{qualified reference to 'W' is a constructor name}}
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W<int>::W<int>::X w1bx;
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typename W<int>::W w2a; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
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typename W<int>::W::X w2ax; // expected-error 0-1{{outside of a template}}
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typename W<int>::W<int> w2b; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
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typename W<int>::W<int>::X w2bx; // expected-error 0-1{{outside of a template}}
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W<int>::template W<int> w3; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
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W<int>::template W<int>::X w3x; // expected-error 0-1{{outside of a template}}
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typename W<int>::template W<int> w4; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-2{{outside of a template}}
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typename W<int>::template W<int>::X w4x; // expected-error 0-2{{outside of a template}}
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TT<W<int>::W> tt1; // expected-error {{qualified reference to 'W' is a constructor name}}
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TTy<W<int>::W> tt1a; // expected-error {{qualified reference to 'W' is a constructor name}}
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TT<W<int>::template W> tt2; // expected-error {{qualified reference to 'W' is a constructor name}} expected-error 0-1{{outside of a template}}
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TT<W<int>::WBase> tt3;
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TTy<W<int>::WBase> tt3a;
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TT<W<int>::template WBase> tt4; // expected-error 0-1{{outside of a template}}
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W<int> w;
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(void)w.W::W::n;
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(void)w.W<int>::W::n;
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(void)w.W<int>::W<int>::n;
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(void)w.W<int>::template W<int>::n; // expected-error 0-1{{outside of a template}}
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}
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template<typename W>
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void wt_test() {
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typename W::W w2a; // expected-error {{qualified reference to 'W' is a constructor name}}
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typename W::template W<int> w4; // expected-error {{qualified reference to 'W' is a constructor name}}
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TTy<typename W::W> tt2; // expected-error {{qualified reference to 'W' is a constructor name}}
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TT<W::template W> tt3; // expected-error {{qualified reference to 'W' is a constructor name}}
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}
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template<typename W>
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void wt_test_good() {
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typename W::W::X w2ax;
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typename W::template W<int>::X w4x;
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TTy<typename W::WBase> tt4;
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TT<W::template WBase> tt5;
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W w;
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(void)w.W::W::n;
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(void)w.W::template W<int>::n;
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(void)w.template W<int>::W::n;
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(void)w.template W<int>::template W<int>::n;
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}
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template void wt_test<W<int> >(); // expected-note {{instantiation of}}
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template void wt_test_good<W<int> >();
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}
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namespace dr1315 { // dr1315: partial
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template <int I, int J> struct A {};
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template <int I> // expected-note {{non-deducible template parameter 'I'}}
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struct A<I + 5, I * 2> {}; // expected-error {{contains a template parameter that cannot be deduced}}
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template <int I> struct A<I, I> {};
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template <int I, int J, int K> struct B;
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template <int I, int K> struct B<I, I * 2, K> {}; // expected-note {{matches}}
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B<1, 2, 3> b1;
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// Multiple declarations with the same dependent expression are equivalent
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// for partial ordering purposes.
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template <int I> struct B<I, I * 2, 2> { typedef int type; };
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B<1, 2, 2>::type b2;
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// Multiple declarations with differing dependent expressions are unordered.
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template <int I, int K> struct B<I, I + 1, K> {}; // expected-note {{matches}}
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B<1, 2, 4> b3; // expected-error {{ambiguous}}
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// FIXME: Under dr1315, this is perhaps valid, but that is not clear: this
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// fails the "more specialized than the primary template" test because the
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// dependent type of T::value is not the same as 'int'.
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// A core issue will be opened to decide what is supposed to happen here.
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template <typename T, int I> struct C;
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template <typename T> struct C<T, T::value>;
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// expected-error@-1 {{type of specialized non-type template argument depends on a template parameter of the partial specialization}}
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}
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namespace dr1330 { // dr1330: 4 c++11
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// exception-specifications are parsed in a context where the class is complete.
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struct A {
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void f() throw(T) {} // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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struct T {};
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#if __cplusplus >= 201103L
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void g() noexcept(&a == b) {}
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static int a;
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static constexpr int *b = &a;
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#endif
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};
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void (A::*af1)() throw(A::T) = &A::f; // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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void (A::*af2)() throw() = &A::f; // expected-error-re {{{{not superset|different exception spec}}}}
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#if __cplusplus >= 201103L
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static_assert(noexcept(A().g()), "");
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#endif
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// Likewise, they're instantiated separately from an enclosing class template.
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template<typename U>
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struct B {
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void f() throw(T, typename U::type) {} // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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struct T {};
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#if __cplusplus >= 201103L
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void g() noexcept(&a == b && U::value) {}
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static int a;
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static constexpr int *b = &a;
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#endif
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};
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B<int> bi; // ok
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struct P {
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typedef int type;
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static const int value = true;
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};
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void (B<P>::*bpf1)() throw(B<P>::T, int) = &B<P>::f; // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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#if __cplusplus < 201103L
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// expected-error@-2 {{not superset}}
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// FIXME: We only delay instantiation in C++11 onwards. In C++98, something
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// weird happens: instantiation of B<P> fails because it references T before
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// it's instantiated, but the diagnostic is suppressed in
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// Sema::FindInstantiatedDecl because we've already hit an error. This is
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// obviously a bad way to react to this situation; we should still producing
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// the "T has not yet been instantiated" error here, rather than giving
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// confusing errors later on.
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#endif
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void (B<P>::*bpf2)() throw(int) = &B<P>::f; // expected-error 0-1{{C++17}} expected-note 0-1{{noexcept}}
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#if __cplusplus <= 201402L
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// expected-error@-2 {{not superset}}
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#else
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// expected-warning@-4 {{not superset}}
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#endif
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void (B<P>::*bpf3)() = &B<P>::f;
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void (B<P>::*bpf4)() throw() = &B<P>::f;
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#if __cplusplus <= 201402L
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// expected-error@-2 {{not superset}}
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#else
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// expected-error@-4 {{different exception specifications}}
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#endif
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#if __cplusplus >= 201103L
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static_assert(noexcept(B<P>().g()), "");
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struct Q { static const int value = false; };
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static_assert(!noexcept(B<Q>().g()), "");
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#endif
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template<typename T> int f() throw(typename T::error) { return 0; } // expected-error 1-4{{prior to '::'}} expected-note 0-1{{prior to '::'}} expected-note 0-1{{requested here}}
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#if __cplusplus > 201402L
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// expected-error@-2 0-1{{C++17}} expected-note@-2 0-1{{noexcept}}
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#endif
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// An exception-specification is needed even if the function is only used in
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// an unevaluated operand.
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int f1 = sizeof(f<int>()); // expected-note {{instantiation of}}
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#if __cplusplus >= 201103L
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decltype(f<char>()) f2; // expected-note {{instantiation of}}
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bool f3 = noexcept(f<float>()); // expected-note {{instantiation of}}
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#endif
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// In C++17 onwards, substituting explicit template arguments into the
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// function type substitutes into the exception specification (because it's
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// part of the type). In earlier languages, we don't notice there's a problem
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// until we've already started to instantiate.
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template int f<short>();
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#if __cplusplus >= 201703L
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// expected-error@-2 {{does not refer to a function template}}
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#else
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// expected-note@-4 {{instantiation of}}
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#endif
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template<typename T> struct C {
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C() throw(typename T::type); // expected-error 1-2{{prior to '::'}}
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#if __cplusplus > 201402L
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// expected-error@-2 0-1{{C++17}} expected-note@-2 0-1{{noexcept}}
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#endif
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};
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struct D : C<void> {}; // ok
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#if __cplusplus < 201103L
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// expected-note@-2 {{instantiation of}}
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#endif
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void f(D &d) { d = d; } // ok
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struct E : C<int> {}; // expected-note {{in instantiation of}}
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#if __cplusplus >= 201103L
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E e; // expected-note {{needed here}}
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#endif
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}
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namespace dr1346 { // dr1346: 3.5
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auto a(1); // expected-error 0-1{{extension}}
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auto b(1, 2); // expected-error {{multiple expressions}} expected-error 0-1{{extension}}
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#if __cplusplus >= 201103L
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auto c({}); // expected-error {{parenthesized initializer list}}
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auto d({1}); // expected-error {{parenthesized initializer list}}
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auto e({1, 2}); // expected-error {{parenthesized initializer list}}
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#endif
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template<typename...Ts> void f(Ts ...ts) { // expected-error 0-1{{extension}}
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auto x(ts...); // expected-error {{empty}} expected-error 0-1{{extension}}
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}
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template void f(); // expected-note {{instantiation}}
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#if __cplusplus >= 201103L
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void init_capture() {
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[a(1)] {} (); // expected-error 0-1{{extension}}
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[b(1, 2)] {} (); // expected-error {{multiple expressions}} expected-error 0-1{{extension}}
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#if __cplusplus >= 201103L
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[c({})] {} (); // expected-error {{parenthesized initializer list}} expected-error 0-1{{extension}}
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[d({1})] {} (); // expected-error {{parenthesized initializer list}} expected-error 0-1{{extension}}
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[e({1, 2})] {} (); // expected-error {{parenthesized initializer list}} expected-error 0-1{{extension}}
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#endif
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}
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#endif
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}
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namespace dr1347 { // dr1347: yes
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auto x = 5, *y = &x; // expected-error 0-1{{extension}}
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auto z = y, *q = y; // expected-error {{'auto' deduced as 'int *' in declaration of 'z' and deduced as 'int' in declaration of 'q'}} expected-error 0-1{{extension}}
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#if __cplusplus >= 201103L
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auto a = 5, b = {1, 2}; // expected-error {{'auto' deduced as 'int' in declaration of 'a' and deduced as 'std::initializer_list<int>' in declaration of 'b'}}
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auto (*fp)(int) -> int, i = 0; // expected-error {{declaration with trailing return type must be the only declaration in its group}}
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#endif
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}
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namespace dr1358 { // dr1358: yes
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#if __cplusplus >= 201103L
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struct Lit { constexpr operator int() const { return 0; } };
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struct NonLit { NonLit(); operator int(); }; // expected-note 2{{no constexpr constructors}}
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struct NonConstexprConv { constexpr operator int() const; };
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struct Virt { virtual int f(int) const; };
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template<typename T, typename U, typename V> struct A : V {
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int member;
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constexpr A(U u) : member(u) {}
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constexpr T f(U u) const { return T(); }
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};
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constexpr A<Lit, Lit, Lit> ce = Lit();
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constexpr int k = ce.f(Lit{});
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// Can have a non-literal return type and parameter type.
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// Constexpr function can be implicitly virtual.
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A<NonLit, NonLit, Virt> a = NonLit();
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void g() { a.f(NonLit()); }
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// Constructor is still constexpr, so this is a literal type.
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static_assert(__is_literal_type(decltype(a)), "");
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// Constructor can call non-constexpr functions.
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A<Lit, NonConstexprConv, Lit> b = NonConstexprConv();
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// But the corresponding non-template cases are rejected.
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struct B : Virt {
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int member;
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constexpr B(NonLit u) : member(u) {} // expected-error {{not a literal type}}
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constexpr NonLit f(NonLit u) const { return NonLit(); } // expected-error {{not a literal type}}
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};
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#endif
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}
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namespace dr1359 { // dr1359: 3.5
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#if __cplusplus >= 201103L
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union A { constexpr A() = default; };
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union B { constexpr B() = default; int a; }; // expected-error {{not constexpr}} expected-note 2{{candidate}}
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union C { constexpr C() = default; int a, b; }; // expected-error {{not constexpr}} expected-note 2{{candidate}}
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struct X { constexpr X() = default; union {}; }; // expected-error {{does not declare anything}}
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struct Y { constexpr Y() = default; union { int a; }; }; // expected-error {{not constexpr}} expected-note 2{{candidate}}
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constexpr A a = A();
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constexpr B b = B(); // expected-error {{no matching}}
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constexpr C c = C(); // expected-error {{no matching}}
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constexpr X x = X();
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constexpr Y y = Y(); // expected-error {{no matching}}
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#endif
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}
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namespace dr1388 { // dr1388: 4
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template<typename A, typename ...T> void f(T..., A); // expected-note 1+{{candidate}} expected-error 0-1{{C++11}}
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template<typename ...T> void g(T..., int); // expected-note 1+{{candidate}} expected-error 0-1{{C++11}}
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template<typename ...T, typename A> void h(T..., A); // expected-note 1+{{candidate}} expected-error 0-1{{C++11}}
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void test_f() {
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f(0); // ok, trailing parameter pack deduced to empty
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f(0, 0); // expected-error {{no matching}}
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f<int>(0);
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f<int>(0, 0); // expected-error {{no matching}}
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f<int, int>(0, 0);
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f<int, int, int>(0, 0); // expected-error {{no matching}}
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g(0);
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g(0, 0); // expected-error {{no matching}}
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g<>(0);
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g<int>(0); // expected-error {{no matching}}
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g<int>(0, 0);
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h(0);
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h(0, 0); // expected-error {{no matching}}
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h<int>(0, 0);
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h<int, int>(0, 0); // expected-error {{no matching}}
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}
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// A non-trailing parameter pack is still a non-deduced context, even though
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// we know exactly how many arguments correspond to it.
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template<typename T, typename U> struct pair {};
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template<typename ...T> struct tuple { typedef char type; }; // expected-error 0-2{{C++11}}
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template<typename ...T, typename ...U> void f_pair_1(pair<T, U>..., int); // expected-error 0-2{{C++11}} expected-note {{[with T = <int, long>]: deduced incomplete pack <(no value), (no value)> for template parameter 'U'}}
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template<typename ...T, typename U> void f_pair_2(pair<T, char>..., U); // expected-error 0-2{{C++11}}
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template<typename ...T, typename ...U> void f_pair_3(pair<T, U>..., tuple<U...>); // expected-error 0-2{{C++11}} expected-note {{deduced packs of different lengths for parameter 'U' (<(no value), (no value)> vs. <char>)}}
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template<typename ...T> void f_pair_4(pair<T, char>..., T...); // expected-error 0-2{{C++11}} expected-note {{<int, long> vs. <int, long, const char *>}}
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void g(pair<int, char> a, pair<long, char> b, tuple<char, char> c) {
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f_pair_1<int, long>(a, b, 0); // expected-error {{no match}}
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f_pair_2<int, long>(a, b, 0);
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f_pair_3<int, long>(a, b, c);
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f_pair_3<int, long>(a, b, tuple<char>()); // expected-error {{no match}}
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f_pair_4<int, long>(a, b, 0, 0L);
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f_pair_4<int, long>(a, b, 0, 0L, "foo"); // expected-error {{no match}}
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}
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}
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namespace dr1391 { // dr1391: partial
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struct A {}; struct B : A {};
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template<typename T> struct C { C(int); typename T::error error; }; // expected-error 2{{'::'}}
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template<typename T> struct D {};
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// No deduction is performed for parameters with no deducible template-parameters, therefore types do not need to match.
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template<typename T> void a(T, int T::*);
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void test_a(int A::*p) { a(A(), p); } // ok, type of second parameter does not need to match
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namespace dr_example_1 {
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template<typename T, typename U> void f(C<T>);
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template<typename T> void f(D<T>);
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void g(D<int> d) {
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f(d); // ok, first 'f' eliminated by deduction failure
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f<int>(d); // ok, first 'f' eliminated because 'U' cannot be deduced
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}
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}
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namespace dr_example_2 {
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template<typename T> typename C<T>::error f(int, T);
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template<typename T> T f(T, T);
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void g(A a) {
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f(a, a); // ok, no conversion from A to int for first parameter of first candidate
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}
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}
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namespace std_example {
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template<typename T> struct Z {
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typedef typename T::x xx;
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};
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template<typename T> typename Z<T>::xx f(void *, T);
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template<typename T> void f(int, T);
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struct A {} a;
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void g() { f(1, a); }
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}
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template<typename T> void b(C<int> ci, T *p);
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void b(...);
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void test_b() {
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b(0, 0); // ok, deduction fails prior to forming a conversion sequence and instantiating C<int>
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// FIXME: The "while substituting" note should point at the overload candidate.
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b<int>(0, 0); // expected-note {{instantiation of}} expected-note {{while substituting}}
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}
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template<typename T> struct Id { typedef T type; };
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template<typename T> void c(T, typename Id<C<T> >::type);
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void test_c() {
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// Implicit conversion sequences for dependent types are checked later.
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c(0.0, 0); // expected-note {{instantiation of}}
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}
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namespace partial_ordering {
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// FIXME: Second template should be considered more specialized because non-dependent parameter is ignored.
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template<typename T> int a(T, short) = delete; // expected-error 0-1{{extension}} expected-note {{candidate}}
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template<typename T> int a(T*, char); // expected-note {{candidate}}
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int test_a = a((int*)0, 0); // FIXME: expected-error {{ambiguous}}
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|
|
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// FIXME: Second template should be considered more specialized:
|
|
// deducing #1 from #2 ignores the second P/A pair, so deduction succeeds,
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|
// deducing #2 from #1 fails to deduce T, so deduction fails.
|
|
template<typename T> int b(T, int) = delete; // expected-error 0-1{{extension}} expected-note {{candidate}}
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template<typename T, typename U> int b(T*, U); // expected-note {{candidate}}
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|
int test_b = b((int*)0, 0); // FIXME: expected-error {{ambiguous}}
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|
|
|
// Unintended consequences: because partial ordering does not consider
|
|
// explicit template arguments, and deduction from a non-dependent type
|
|
// vacuously succeeds, a non-dependent template is less specialized than
|
|
// anything else!
|
|
// According to DR1391, this is ambiguous!
|
|
template<typename T> int c(int);
|
|
template<typename T> int c(T);
|
|
int test_c1 = c(0); // ok
|
|
int test_c2 = c<int>(0); // FIXME: apparently ambiguous
|
|
}
|
|
}
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|
|
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namespace dr1399 { // dr1399: dup 1388
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|
template<typename ...T> void f(T..., int, T...) {} // expected-note {{candidate}} expected-error 0-1{{C++11}}
|
|
void g() {
|
|
f(0);
|
|
f<int>(0, 0, 0);
|
|
f(0, 0, 0); // expected-error {{no match}}
|
|
}
|
|
}
|