test/Parser/cxx0x-attributes.cpp

// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 %s

// Declaration syntax checks
[[]] int before_attr;
int [[]] between_attr;
int after_attr [[]];
int * [[]] ptr_attr;
int & [[]] ref_attr = after_attr;
int && [[]] rref_attr = 0;
int array_attr [1] [[]];
alignas(8) int aligned_attr;
[[test::valid(for 42 [very] **** '+' symbols went on a trip; the end.)]]
  int garbage_attr;
[[,,,static, class, namespace,, inline, constexpr, mutable,, bi\
tand, bitor::compl(!.*_ Cx.!U^*R),,,]] int more_garbage_attr;
[[u8"invalid!"]] int invalid_string_attr; // expected-error {{expected ']'}}
void fn_attr () [[]];
void noexcept_fn_attr () noexcept [[]];
struct MemberFnOrder {
  virtual void f() const volatile && noexcept [[]] final = 0;
};
class [[]] class_attr {};
extern "C++" [[]] int extern_attr;
template <typename T> [[]] void template_attr ();
[[]] [[]] int [[]] [[]] multi_attr [[]] [[]];

int comma_attr [[,]];
int scope_attr [[foo::]]; // expected-error {{expected identifier}}
int (paren_attr) [[]]; // expected-error {{an attribute list cannot appear here}}
unsigned [[]] int attr_in_decl_spec; // expected-error {{expected unqualified-id}}
class foo {
  void const_after_attr () [[]] const; // expected-error {{expected ';'}}
};
extern "C++" [[]] { } // expected-error {{an attribute list cannot appear here}}
[[]] template <typename T> void before_template_attr (); // expected-error {{an attribute list cannot appear here}}
[[]] namespace ns { int i; } // expected-error {{an attribute list cannot appear here}} expected-note {{declared here}}
[[]] static_assert(true, ""); //expected-error {{an attribute list cannot appear here}}
[[]] asm(""); // expected-error {{an attribute list cannot appear here}}

[[]] using ns::i; // expected-error {{an attribute list cannot appear here}}
[[]] using namespace ns;

// Argument tests
alignas int aligned_no_params; // expected-error {{expected '('}}
alignas(i) int aligned_nonconst; // expected-error {{'aligned' attribute requires integer constant}} expected-note {{read of non-const variable 'i'}}

// Statement tests
void foo () {
  [[]] ;
  [[]] { }
  [[]] if (0) { }
  [[]] for (;;);
  [[]] do {
    [[]] continue;
  } while (0);
  [[]] while (0);
  
  [[]] switch (i) {
    [[]] case 0:
    [[]] default:
      [[]] break;
  }
  
  [[]] goto there;
  [[]] there:
  
  [[]] try {
  } [[]] catch (...) { // expected-error {{an attribute list cannot appear here}}
  }
  struct S { int arr[2]; } s;
  (void)s.arr[ [] { return 0; }() ]; // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
  int n = __builtin_offsetof(S, arr[ [] { return 0; }() ]); // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}

  [[]] return;
}

template<typename...Ts> void variadic() {
  void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
}