forked from OSchip/llvm-project
292 lines
9.4 KiB
C++
292 lines
9.4 KiB
C++
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fexceptions -fcxx-exceptions -verify %s
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// RUN: %clang_cc1 -std=c++2a -fsyntax-only -fexceptions -fcxx-exceptions -verify %s
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template<typename... Types> struct tuple;
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template<int I> struct int_c;
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template<typename T>
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struct identity {
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typedef T type;
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};
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template<typename T, typename U>
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struct is_same {
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static const bool value = false;
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};
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template<typename T>
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struct is_same<T, T> {
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static const bool value = true;
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};
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// FIXME: Several more bullets to go
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// In a function parameter pack, the pattern is the parameter-declaration
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// without the ellipsis.
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namespace PR11850 {
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template<typename ...T> struct S {
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int f(T...a, int b) { return b; }
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};
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S<> s;
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S<int*, char, const double&> t;
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int k = s.f(0);
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int l = t.f(&k, 'x', 5.9, 4);
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template<typename ...As> struct A {
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template<typename ...Bs> struct B {
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template<typename ...Cs> struct C {
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C(As..., Bs..., int &k, Cs...);
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};
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};
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};
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A<>::B<>::C<> c000(k);
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A<int>::B<>::C<int> c101(1, k, 3);
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A<>::B<int>::C<int> c011(1, k, 3);
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A<int>::B<int>::C<> c110(1, 2, k);
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A<int, int>::B<int, int>::C<int, int> c222(1, 2, 3, 4, k, 5, 6);
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A<int, int, int>::B<>::C<> c300(1, 2, 3, k);
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int &f();
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char &f(void*);
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template<typename ...A> struct U {
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template<typename ...B> struct V {
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auto g(A...a, B...b) -> decltype(f(a...));
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};
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};
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U<>::V<int*> v0;
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U<int*>::V<> v1;
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int &v0f = v0.g(0);
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char &v1f = v1.g(0);
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}
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namespace PR12096 {
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void Foo(int) {}
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void Foo(int, int) = delete;
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template<typename ...Args> struct Var {
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Var(const Args &...args, int *) { Foo(args...); }
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};
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Var<int> var(1, 0);
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}
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// In an initializer-list (8.5); the pattern is an initializer-clause.
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// Note: this also covers expression-lists, since expression-list is
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// just defined as initializer-list.
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void five_args(int, int, int, int, int); // expected-note{{candidate function not viable: requires 5 arguments, but 6 were provided}}
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template<int ...Values>
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void initializer_list_expansion() {
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int values[5] = { Values... }; // expected-error{{excess elements in array initializer}}
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five_args(Values...); // expected-error{{no matching function for call to 'five_args'}}
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}
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template void initializer_list_expansion<1, 2, 3, 4, 5>();
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template void initializer_list_expansion<1, 2, 3, 4, 5, 6>(); // expected-note{{in instantiation of function template specialization 'initializer_list_expansion<1, 2, 3, 4, 5, 6>' requested here}}
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namespace PR8977 {
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struct A { };
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template<typename T, typename... Args> void f(Args... args) {
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// An empty expression-list performs value initialization.
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constexpr T t(args...);
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};
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template void f<A>();
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}
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// In a base-specifier-list (Clause 10); the pattern is a base-specifier.
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template<typename ...Mixins>
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struct HasMixins : public Mixins... {
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HasMixins();
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HasMixins(const HasMixins&);
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HasMixins(int i);
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};
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struct A { }; // expected-note{{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const A' for 1st argument}} \
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// expected-note{{candidate constructor (the implicit move constructor) not viable: no known conversion from 'int' to 'A' for 1st argument}} \
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// expected-note{{candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided}}
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struct B { };
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struct C { };
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struct D { };
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A *checkA = new HasMixins<A, B, C, D>;
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B *checkB = new HasMixins<A, B, C, D>;
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D *checkD = new HasMixins<A, B, C, D>;
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C *checkC = new HasMixins<A, B, D>; // expected-error{{cannot initialize a variable of type 'C *' with an rvalue of type 'HasMixins<A, B, D> *'}}
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HasMixins<> *checkNone = new HasMixins<>;
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template<typename Mixins>
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struct BrokenMixins : public Mixins... { }; // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
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// In a mem-initializer-list (12.6.2); the pattern is a mem-initializer.
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template<typename ...Mixins>
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HasMixins<Mixins...>::HasMixins(): Mixins()... { }
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template<typename ...Mixins>
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HasMixins<Mixins...>::HasMixins(const HasMixins &other): Mixins(other)... { }
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template<typename ...Mixins>
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HasMixins<Mixins...>::HasMixins(int i): Mixins(i)... { } // expected-error{{no matching constructor for initialization of 'A'}}
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void test_has_mixins() {
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HasMixins<A, B> ab;
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HasMixins<A, B> ab2 = ab;
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HasMixins<A, B> ab3(17); // expected-note{{in instantiation of member function 'HasMixins<A, B>::HasMixins' requested here}}
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}
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template<typename T>
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struct X {
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T member;
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X() : member()... { } // expected-error{{pack expansion for initialization of member 'member'}}
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};
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// There was a bug in the delayed parsing code for the
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// following case.
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template<typename ...T>
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struct DelayedParseTest : T...
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{
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int a;
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DelayedParseTest(T... i) : T{i}..., a{10} {}
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};
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// In a template-argument-list (14.3); the pattern is a template-argument.
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template<typename ...Types>
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struct tuple_of_refs {
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typedef tuple<Types& ...> types;
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};
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tuple<int&, float&> *t_int_ref_float_ref;
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tuple_of_refs<int&, float&>::types *t_int_ref_float_ref_2 = t_int_ref_float_ref;
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template<typename ...Types>
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struct extract_nested_types {
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typedef tuple<typename Types::type...> types;
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};
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tuple<int, float> *t_int_float;
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extract_nested_types<identity<int>, identity<float> >::types *t_int_float_2
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= t_int_float;
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template<int ...N>
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struct tuple_of_ints {
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typedef tuple<int_c<N>...> type;
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};
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int check_temp_arg_1[is_same<tuple_of_ints<1, 2, 3, 4, 5>::type,
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tuple<int_c<1>, int_c<2>, int_c<3>, int_c<4>,
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int_c<5>>>::value? 1 : -1];
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#if __cplusplus < 201703L
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// In a dynamic-exception-specification (15.4); the pattern is a type-id.
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template<typename ...Types>
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struct f_with_except {
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virtual void f() throw(Types...); // expected-note{{overridden virtual function is here}}
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};
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struct check_f_with_except_1 : f_with_except<int, float> {
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virtual void f() throw(int, float);
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};
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struct check_f_with_except_2 : f_with_except<int, float> {
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virtual void f() throw(int);
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};
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struct check_f_with_except_3 : f_with_except<int, float> {
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virtual void f() throw(int, float, double); // expected-error{{exception specification of overriding function is more lax than base version}}
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};
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#endif
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namespace PackExpansionWithinLambda {
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void swallow(...);
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template<typename ...T, typename ...U> void f(U ...u) {
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swallow([=] {
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// C++17 [temp.variadic]p4:
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// Pack expansions can occur in the following contexts:
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// - in a function parameter pack
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void g(T...);
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#if __cplusplus >= 201703L
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struct A : T... {
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// - in a using-declaration
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using T::x...;
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using typename T::U...;
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};
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#endif
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// - in a template parameter pack that is a pack expansion
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// FIXME: We do not support any way to reach this case yet.
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// - in an initializer-list
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int arr[] = {T().x...};
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// - in a base-specifier-list
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struct B : T... {
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// - in a mem-initializer-list
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B() : T{0}... {}
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};
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// - in a template-argument-list
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f<T...>();
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// - in an attribute-list
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// FIXME: We do not support any such attributes yet.
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// - in an alignment-specifier
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alignas(T...) int y;
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// - in a capture-list
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[](T ...t) { [t...]{}(); } (T()...);
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// - in a sizeof... expression
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const int k1 = sizeof...(T);
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#if __cplusplus >= 201703L
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// - in a fold-expression
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const int k2 = ((sizeof(T)/sizeof(T)) + ...);
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static_assert(k1 == k2);
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#endif
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// Trigger clang to look in here for unexpanded packs.
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U u;
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} ...);
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}
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template<typename ...T> void nested() {
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swallow([=] {
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[](T ...t) { [t]{}(); } (T()...); // expected-error {{unexpanded parameter pack 't'}}
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}...); // expected-error {{does not contain any unexpanded}}
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}
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template <typename ...T> void g() {
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// Check that we do detect the above cases when the pack is not expanded.
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swallow([=] { void h(T); }); // expected-error {{unexpanded parameter pack 'T'}}
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swallow([=] { struct A : T {}; }); // expected-error {{unexpanded parameter pack 'T'}}
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#if __cplusplus >= 201703L
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swallow([=] { struct A : T... { using T::x; }; }); // expected-error {{unexpanded parameter pack 'T'}}
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swallow([=] { struct A : T... { using typename T::U; }; }); // expected-error {{unexpanded parameter pack 'T'}}
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#endif
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swallow([=] { int arr[] = {T().x}; }); // expected-error {{unexpanded parameter pack 'T'}}
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swallow([=] { struct B : T... { B() : T{0} {} }; }); // expected-error {{unexpanded parameter pack 'T'}}
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swallow([=] { f<T>(); }); // expected-error {{unexpanded parameter pack 'T'}}
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swallow([=] { alignas(T) int y; }); // expected-error {{unexpanded parameter pack 'T'}}
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swallow([=] { [](T ...t) {
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[t]{}(); // expected-error {{unexpanded parameter pack 't'}}
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} (T()...); });
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}
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struct T { int x; using U = int; };
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void g() { f<T>(1, 2, 3); }
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template<typename ...T, typename ...U> void pack_in_lambda(U ...u) { // expected-note {{here}}
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// FIXME: Move this test into 'f' above once we support this syntax.
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[]<T *...v, template<T *> typename ...U>(U<v> ...uv) {}; // expected-error {{expected body of lambda}} expected-error {{does not refer to a value}}
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}
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template<typename ...T> void pack_expand_attr() {
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// FIXME: Move this test into 'f' above once we support this.
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[[gnu::aligned(alignof(T))...]] int x; // expected-error {{cannot be used as an attribute pack}} expected-error {{unexpanded}}
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}
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}
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