@s atomic int @* Attributes. This is just all of the examples from the sections aboutattributes in the \CEE/ and \CPLUSPLUS/ standards collected together, with mostcomments removed. @c[[using CC: opt(1), debug]]  void f() {}[[using CC: opt(1)]] [[CC::debug]]  void g() {}[[using CC: CC::opt(1)]]  void h() {} int p[10];void f() {  int x = 42, y[5];  int i [[vendor::attr([[]])]];} alignas(double) unsigned char c[sizeof(double)];extern unsigned char c[sizeof(double)]; struct foo { int* a; int* b; };std::atomic<struct foo *> foo_head[10]; int foo_array[10][10]; [[carries_dependency]] struct foo* f(int i) {  return foo_head[i].load(memory_order::consume);} int g(int* x, int* y [[carries_dependency]]) {  return kill_dependency(foo_array[*x][*y]);} [[carries_dependency]] struct foo* f(int i);int g(int* x, int* y [[carries_dependency]]); int c = 3; void h(int i) {  struct foo* p;   p = f(i);  do_something_with(g(&c, p->a));  do_something_with(g(p->a, &c));} void f(int n) {  void g(), h(), i();  switch (n) {  case 1:  case 2:    g();    [[fallthrough]];  case 3:    do {      [[fallthrough]];    } while (false);  case 6:    do {      [[fallthrough]];    } while (n--);  case 7:    while (false) {      [[fallthrough]];    }  case 5:    h();  case 4:    i();    [[fallthrough]];  }} void g(int);int f(int n) {  if (n > 5) [[unlikely]] {    g(0);    return n * 2 + 1;  }   switch (n) {  case 1:    g(1);    [[fallthrough]];   [[likely]] case 2:    g(2);    break;  }  return 3;} [[maybe_unused]] void f([[maybe_unused]] bool thing1,                        [[maybe_unused]] bool thing2) {  [[maybe_unused]] bool b = thing1 && thing2;  assert(b);} struct [[nodiscard]] my_scopeguard { int x; };struct my_unique {  my_unique() = default;  [[nodiscard]] my_unique(int fd) { /* \dots */ }  ~my_unique() noexcept { /* \dots */ }  /* \dots */};struct [[nodiscard]] error_info { /* \dots */ };error_info enable_missile_safety_mode();void launch_missiles();void test_missiles() {  my_scopeguard();  (void)my_scopeguard(),    launch_missiles();  my_unique(42);  my_unique();  enable_missile_safety_mode();  launch_missiles();}error_info &foo();void f() { foo(); }  [[ noreturn ]] void f() {  throw "error";} [[ noreturn ]] void q(int i) {  if (i > 0)    throw "positive";} template<typename Key, typename Value,         typename Hash, typename Pred, typename Allocator>class hash_map {  [[no_unique_address]] Hash hasher;  [[no_unique_address]] Pred pred;  [[no_unique_address]] Allocator alloc;  Bucket *buckets; public: }; [[deprecated, hal::daisy]] double nine1000(double);[[deprecated]] [[hal::daisy]] double nine1000(double);[[deprecated]] double nine1000 [[hal::daisy]] (double); [[__deprecated__, __hal__::__daisy__]] double nine1000(double);[[__deprecated__]] [[__hal__::__daisy__]] double nine1000(double);[[__deprecated__]] double nine1000 [[__hal__::__daisy__]] (double);[[hal::daisy, hal::rosie]] double nine999(double);[[hal::rosie, hal::daisy]] double nine999(double); [[hal::daisy]] [[hal::rosie]] double nine999(double);[[hal::rosie]] [[hal::daisy]] double nine999(double); struct [[nodiscard]] error_info { /*\dots*/ };struct error_info enable_missile_safety_mode(void);void launch_missiles(void);void test_missiles(void) {enable_missile_safety_mode();launch_missiles();} [[nodiscard]] int important_func(void);void call(void) {int i = important_func();} [[nodiscard("must check armed state")]]bool arm_detonator(int);void call(void) {arm_detonator(3);detonate();} [[maybe_unused]] void f([[maybe_unused]] int i) {[[maybe_unused]] int j = i + 100;assert(j);} struct [[deprecated]] S {int a;};enum [[deprecated]] E1 {one};enum E2 {two [[deprecated("use ’three’ instead")]],three};[[deprecated]] typedef int Foo;void f1(struct S s) {int i = one;int j = two;int k = three;Foo f;}[[deprecated]] void f2(struct S s) {int i = one;int j = two;int k = three;Foo f;}struct [[deprecated]] T {Foo f;struct S s;}; void f(int n) {void g(void), h(void), i(void);switch (n) {case 1: /* diagnostic on fallthrough discouraged */case 2:g();[[fallthrough]];case 3: /* diagnostic on fallthrough discouraged */h();case 4: /* fallthrough diagnostic encouraged */i();[[fallthrough]]; /* constraint violation */}} @* Numbers. Here are new numbers. @c int main(void){  int decimal_integer = 100;  int octal_integer = 0240;  int binary_integer = 0b10101011;  int separated_integer = 100'000'000;  float binary_exponent = 0x1FFFFp10;  float separated_float = 123.456'789'000e2;  int normal_exponent = 123'456e789;} @* Index.