1 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++14
2 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++17 -pedantic
3
4 // [expr.new]p2 ... the invented declaration: T x init ;
5 // C++23 [dcl.type.auto.deduct]p2.2
6 // For a variable declared with a type that contains a placeholder type, T is the declared type of the variable.
f()7 void f() {
8 // - If the initializer is a parenthesized expression-list, the expression-list shall be a single assignmentexpression and E is the assignment-expression.
9 new auto('a');
10 new decltype(auto)('a');
11 // - If the initializer is a braced-init-list, it shall consist of a single brace-enclosed assignment-expression and E is the assignment-expression.
12 new auto{2};
13 new decltype(auto){2};
14
15 new auto{}; // expected-error{{new expression for type 'auto' requires a constructor argument}}
16 new auto({}); // expected-error{{cannot deduce actual type for 'auto' from parenthesized initializer list}}
17 new auto{{}}; // expected-error{{cannot deduce actual type for 'auto' from nested initializer list}}
18
19 new auto({2}); // expected-error{{cannot deduce actual type for 'auto' from parenthesized initializer list}}
20 new auto{{2}}; // expected-error{{cannot deduce actual type for 'auto' from nested initializer list}}
21 new auto{1, 2}; // expected-error{{new expression for type 'auto' contains multiple constructor arguments}}
22
23 new decltype(auto){}; // expected-error{{new expression for type 'decltype(auto)' requires a constructor argument}}
24 new decltype(auto)({}); // expected-error{{cannot deduce actual type for 'decltype(auto)' from parenthesized initializer list}}
25 new decltype(auto){{}}; // expected-error{{cannot deduce actual type for 'decltype(auto)' from nested initializer list}}
26
27 new decltype(auto)({1}); // expected-error{{cannot deduce actual type for 'decltype(auto)' from parenthesized initializer list}}
28 new decltype(auto){1, 2}; // expected-error{{new expression for type 'decltype(auto)' contains multiple constructor arguments}}
29 new decltype(auto)({1, 2}); // expected-error{{cannot deduce actual type for 'decltype(auto)' from parenthesized initializer list}}
30 }
31