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// RUN: %clang_cc1 -std=c++20 -pedantic -verify %s
struct X {
using type = int;
static constexpr int value = 1;
class tclass {};
};
template <typename T>
void f() {
// it is a qualified name in a type-id-only context (see below), or
// [its smallest enclosing [/new/defining/]-type-id is]:
// - a new-type-id
auto *Ptr = new T::type();
// - a defining-type-id
class T::tclass Empty1;
T::tclass Empty2; // expected-error{{missing 'typename'}}
// - a trailing-return-type
auto f()->T::type;
// - default argument of a type-parameter of a template [see below]
// - type-id of a
// static_cast,
auto StaticCast = static_cast<T::type>(1.2);
// const_cast,
const auto *ConstCast = const_cast<const T::type *>(Ptr);
// reinterpret_cast,
int ReinterpretCast = reinterpret_cast<T::type>(4);
// dynamic_cast
struct B {
virtual ~B() = default;
};
struct D : T::tclass {};
auto *Base = dynamic_cast<T::tclass *>(new B);
T::type Invalid; // expected-error{{missing 'typename'}}
}
template void f<X>();
// As default argument.
template <typename T, typename = T::type>
struct DefaultArg {};
template struct DefaultArg<X>;
// it is a decl-specifier of the decl-specifier-seq of a
// - simple-declaration or a function-definition in namespace scope
template <typename T>
T::type VarTemp = 1;
template int VarTemp<X>;
template <typename T>
T::type FuncDef() { return 1; }
template int FuncDef<X>();
template <typename T>
T::type funcDecl();
template <typename T>
void FuncParam(T::type); // ok, but variable template
// expected-error@-1{{variable has incomplete type 'void'}}
template <typename T>
void FuncParam2(const T::type, int); // expected-error{{missing 'typename'}}
template <typename T>
struct MemberDecl {
// member-declaration,
T::type Member;
// parameter-declaration in a member-declaration, unless that
// parameter-declaration appears in a default argument
void NoDefault(T::type);
void Default(int A = T::value);
};
template struct MemberDecl<X>;
// parameter-declaration in a declarator of a function or function template
// declaration where the declarator-id is qualified, unless that
// parameter-declaration appears in a default argument,
struct QualifiedFunc {
template <typename T>
void foo(typename T::type);
template <typename T>
void bar(T::type);
};
template <typename T>
void QualifiedFunc::foo(T::type) {}
template <typename T>
void QualifiedFunc::bar(typename T::type) {}
template <typename T>
void g() {
// parameter-declaration in a lambda-declarator, unless that
// parameter-declaration appears in a default argument, or
auto Lambda1 = [](T::type) {};
auto Lambda2 = [](int A = T::value) {};
}
template void g<X>();
// parameter-declaration of a (non-type) template-parameter.
template <typename T, T::type>
void NonTypeArg() {}
template void NonTypeArg<X, 0>();
template <typename T>
void f(T::type) {} // expected-error {{missing 'typename'}}
namespace N {
template <typename T>
int f(typename T::type);
template <typename T>
extern int Var;
}
template <typename T>
int N::f(T::type); // ok, function
template <typename T>
int N::Var(T::value); // ok, variable
int h() {
return N::f<X>(10) + N::Var<X>;
}
namespace NN {
inline namespace A { template <typename T> int f(typename T::type); } // expected-note{{previous definition is here}}
inline namespace B { template <typename T> int f(T::type); }
}
template <typename T>
int NN::f(T::type); // expected-error{{redefinition of 'f' as different kind of symbol}}
template <auto V>
struct videntity {
static constexpr auto value = V;
};
template <typename T,
bool = T::value,
bool = bool(T::value),
bool = videntity<bool(T::value)>::value>
void f(int = T::value) {}
template <typename> int test() = delete;
template <auto> int test();
template <typename T>
int Test = test<int(T::value)>();
template int Test<X>;
template<typename T> struct A {
enum E : T::type {}; // expected-error{{missing 'typename'}}
operator T::type() {} // expected-error{{missing 'typename'}}
void f() { this->operator T::type(); } // expected-error{{missing 'typename'}}
};
template<typename T>
struct C {
C(T::type); // implicit typename context
friend C (T::fn)(); // not implicit typename context, declarator-id of friend declaration
C(T::type::*x)[3]; // not implicit typename context, pointer-to-member type
};
template <typename T>
C<T>::C(T::type) {}
namespace GH63119 {
struct X {
X(int);
X(auto);
void f(int);
};
template<typename T> struct S {
friend X::X(T::type);
friend X::X(T::type = (int)(void(*)(typename T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}}
friend X::X(T::type = (int)(void(*)(T::type))(nullptr)); // expected-error {{friend declaration specifying a default argument must be a definition}} \
// expected-error {{expected expression}}
friend void X::f(T::type);
};
}
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