31 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++142// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++17 -pedantic3 4// [expr.new]p2 ... the invented declaration: T x init ;5// C++23 [dcl.type.auto.deduct]p2.26// For a variable declared with a type that contains a placeholder type, T is the declared type of the variable.7void 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