forked from OSchip/llvm-project
109 lines
5.5 KiB
C++
109 lines
5.5 KiB
C++
// RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -verify %s
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// RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -verify %s -DCLASS
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#ifdef CLASS
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struct Outer {
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#endif
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template<typename> struct A {};
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// Valid forms.
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A(int(&)[1]) -> A<int>;
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explicit A(int(&)[2]) -> A<int>;
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// Declarator pieces are not OK.
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*A(int(&)[3]) -> A<int>; // expected-error {{cannot specify any part of a return type in the declaration of a deduction guide}}
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&A(int(&)[4]) -> A<int>; // expected-error {{cannot specify any part of a return type in the declaration of a deduction guide}}
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A(int(&)[5])[3] -> A<int>;
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#ifdef CLASS // FIXME: These diagnostics are both pretty bad.
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// expected-error@-2 {{function cannot return array type}} expected-error@-2 {{';'}}
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#else
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// expected-error@-4 {{expected function body after function declarator}}
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#endif
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(A[3])(int(&)[5][1]) -> A<int>; // expected-error {{'<deduction guide for A>' cannot be the name of a variable}}
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#ifndef CLASS
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// expected-error@-2 {{declared as array of functions}}
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#endif
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(*A)(int(&)[5][2]) -> A<int>; // expected-error {{'<deduction guide for A>' cannot be the name of a variable}}
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(&A)(int(&)[5][3]) -> A<int>; // expected-error {{'<deduction guide for A>' cannot be the name of a variable}}
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(*A(int))(int(&)[5][4]) -> A<int>; // expected-error {{cannot specify any part of a return type in the declaration of a deduction guide}}
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// (Pending DR) attributes and parens around the declarator-id are OK.
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[[deprecated]] A(int(&)[6]) [[]] -> A<int> [[]];
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A [[]] (int(&)[7]) -> A<int>;
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(A)(int(&)[8]) -> A<int>;
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// ... but the trailing-return-type is part of the function-declarator as normal
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(A(int(&)[9])) -> A<int>;
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#ifdef CLASS // FIXME: These diagnostics are both pretty bad.
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// expected-error@-2 {{deduction guide declaration without trailing return type}} expected-error@-2 {{';'}}
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#else
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// expected-error@-4 {{expected function body after function declarator}}
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#endif
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(A(int(&)[10]) -> A<int>); // expected-error {{trailing return type may not be nested within parentheses}}
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// A trailing-return-type is mandatory.
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A(int(&)[11]); // expected-error {{deduction guide declaration without trailing return type}}
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// No type specifier is permitted; we don't even parse such cases as a deduction-guide.
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int A(int) -> A<int>; // expected-error {{function with trailing return type must specify return type 'auto', not 'int'}}
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template<typename T> struct B {}; // expected-note {{here}}
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auto B(int) -> B<int>; // expected-error {{redefinition of 'B' as different kind of symbol}}
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// No storage class specifier, function specifier, ...
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friend A(int(&)[20]) -> A<int>;
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#ifdef CLASS
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// expected-error@-2 {{cannot declare a deduction guide as a friend}}
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#else
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// expected-error@-4 {{'friend' used outside of class}}
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#endif
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typedef A(int(&)[21]) -> A<int>; // expected-error {{deduction guide cannot be declared 'typedef'}}
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constexpr A(int(&)[22]) -> A<int>; // expected-error {{deduction guide cannot be declared 'constexpr'}}
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inline A(int(&)[23]) -> A<int>; // expected-error {{deduction guide cannot be declared 'inline'}}
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static A(int(&)[24]) -> A<int>; // expected-error {{deduction guide cannot be declared 'static'}}
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thread_local A(int(&)[25]) -> A<int>; // expected-error {{'thread_local' is only allowed on variable declarations}}
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extern A(int(&)[26]) -> A<int>;
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#ifdef CLASS
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// expected-error@-2 {{storage class specified for a member}}
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#else
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// expected-error@-4 {{deduction guide cannot be declared 'extern'}}
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#endif
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mutable A(int(&)[27]) -> A<int>; // expected-error-re {{{{'mutable' cannot be applied to|illegal storage class on}} function}}
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virtual A(int(&)[28]) -> A<int>; // expected-error {{'virtual' can only appear on non-static member functions}}
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const A(int(&)[28]) -> A<int>; // expected-error {{deduction guide cannot be declared 'const'}}
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const volatile static constexpr inline A(int(&)[29]) -> A<int>; // expected-error {{deduction guide cannot be declared 'static inline constexpr const volatile'}}
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A(int(&)[30]) const -> A<int>; // expected-error {{deduction guide cannot have 'const' qualifier}}
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// No definition is allowed.
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A(int(&)[40]) -> A<int> {} // expected-error {{deduction guide cannot have a function definition}}
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A(int(&)[41]) -> A<int> = default; // expected-error {{deduction guide cannot have a function definition}} expected-error {{only special member functions may be defaulted}}
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A(int(&)[42]) -> A<int> = delete; // expected-error {{deduction guide cannot have a function definition}}
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A(int(&)[43]) -> A<int> try {} catch (...) {} // expected-error {{deduction guide cannot have a function definition}}
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#ifdef CLASS
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};
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#endif
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namespace ExplicitInst {
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// Explicit instantiation / specialization is not permitted.
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template<typename T> struct B {};
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template<typename T> B(T) -> B<T>;
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template<> B(int) -> B<int>; // expected-error {{deduction guide cannot be explicitly specialized}}
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extern template B(float) -> B<float>; // expected-error {{deduction guide cannot be explicitly instantiated}}
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template B(char) -> B<char>; // expected-error {{deduction guide cannot be explicitly instantiated}}
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// An attempt at partial specialization doesn't even parse as a deduction-guide.
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template<typename T> B<T*>(T*) -> B<T*>; // expected-error 1+{{}} expected-note 0+{{}}
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struct X {
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template<typename T> struct C {};
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template<typename T> C(T) -> C<T>;
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template<> C(int) -> C<int>; // expected-error {{explicit specialization of '<deduction guide for C>' in class scope}}
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extern template C(float) -> C<float>; // expected-error {{expected member name or ';'}}
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template C(char) -> C<char>; // expected-error {{expected '<' after 'template'}}
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};
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}
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