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Summary of declarations

declaration:
declaration-specifiers attribute-seqopt1 init-declarator-listopt ;
static_assert-declaration

declaration-specifiers:
storage-class-specifier declaration-specifiersopt
type-specifier declaration-specifiersopt
type-qualifier declaration-specifiersopt
function-specifier declaration-specifiersopt
alignment-specifier declaration-specifiersopt

attribute-seq1:
attribute1 attribute-seqopt1

attribute1, 2: one of
__asm __based __cdecl __clrcall __fastcall __inline __stdcall __thiscall __vectorcall

init-declarator-list:
init-declarator
init-declarator-list , init-declarator

init-declarator:
declarator
declarator = initializer

storage-class-specifier:
auto
extern
register
static
_Thread_local
typedef
__declspec ( extended-decl-modifier-seq )1

extended-decl-modifier-seq1:
extended-decl-modifieropt
extended-decl-modifier-seq extended-decl-modifier

extended-decl-modifier1:
thread
naked
dllimport
dllexport

type-specifier:
void
char
short
int
__int81
__int161
__int321
__int641
long
float
double
signed
unsigned
_Bool
_Complex
atomic-type-specifier
struct-or-union-specifier
enum-specifier
typedef-name

struct-or-union-specifier:
struct-or-union identifieropt { struct-declaration-list }
struct-or-union identifier

struct-or-union:
struct
union

struct-declaration-list:
struct-declaration
struct-declaration-list struct-declaration

struct-declaration:
specifier-qualifier-list struct-declarator-listopt ;
static_assert-declaration

specifier-qualifier-list:
type-specifier specifier-qualifier-listopt
type-qualifier specifier-qualifier-listopt
alignment-specifier specifier-qualifier-listopt

struct-declarator-list:
struct-declarator
struct-declarator-list , struct-declarator

struct-declarator:
declarator
declaratoropt : constant-expression

enum-specifier:
enum identifieropt { enumerator-list }
enum identifieropt { enumerator-list , }
enum identifier

enumerator-list:
enumerator
enumerator-list , enumerator

enumerator:
enumeration-constant
enumeration-constant = constant-expression

atomic-type-specifier:
_Atomic ( type-name )

type-qualifier:
const
restrict
volatile
_Atomic

function-specifier:
inline
_Noreturn

alignment-specifier:
_Alignas ( type-name )
_Alignas ( constant-expression )

declarator:
pointeropt direct-declarator

direct-declarator:
identifier
( declarator )
direct-declarator [ type-qualifier-listopt assignment-expressionopt ]
direct-declarator [ static type-qualifier-listopt assignment-expression ]
direct-declarator [ type-qualifier-list static assignment-expression ]
direct-declarator [ type-qualifier-listopt * ]
direct-declarator ( parameter-type-list )
direct-declarator ( identifier-listopt )3

pointer:
* type-qualifier-listopt
* type-qualifier-listopt pointer

type-qualifier-list:
type-qualifier
type-qualifier-list type-qualifier

parameter-type-list:
parameter-list
parameter-list , ...

parameter-list:
parameter-declaration
parameter-list , parameter-declaration

parameter-declaration:
declaration-specifiers declarator
declaration-specifiers abstract-declaratoropt

identifier-list: /* For old-style declarator */
identifier
identifier-list , identifier

type-name:
specifier-qualifier-list abstract-declaratoropt

abstract-declarator:
pointer
pointeropt direct-abstract-declarator

direct-abstract-declarator:
( abstract-declarator )
direct-abstract-declarator [ type-qualifier-listopt assignment-expressionopt ]
direct-abstract-declarator [ static type-qualifier-listopt assignment-expression ]
direct-abstract-declarator [ type-qualifier-list static assignment-expression ]
direct-abstract-declarator [ type-qualifier-listopt * ]
direct-abstract-declaratoropt ( parameter-type-listopt )

typedef-name:
identifier

initializer:
assignment-expression
{ initializer-list }
{ initializer-list , }

initializer-list:
designationopt initializer
initializer-list , designationopt initializer

designation:
designator-list =

designator-list:
designator
designator-list designator

designator:
[ constant-expression ]
. identifier

static_assert-declaration:
_Static_assert ( constant-expression , string-literal ) ;

1 This grammar element is Microsoft-specific.
2 For more information about these elements, see __asm, __clrcall, __stdcall, __based, __fastcall, __thiscall, __cdecl, __inline, and __vectorcall.
3 This style is obsolete.

See also

Calling conventions
Phrase structure grammar
Obsolete calling conventions