clang/test/CXX/expr/expr.unary/expr.new/p2-cxx1z.cpp

   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.
   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 }