declaration

translation-unit ::= [declaration-seq]

declaration-seq ::= declaration | declaration-seq declaration

declaration ::= block-decl | function-decl | template-decl | explicit-instantiation |

    explicit-specialization | linkage-specification | namespace-defn

block-decl ::= simple-decl | asm-defn | namespace-alias-defn | using-decl | 

    using-directive

simple-decl ::= [decl-specifier-seq] [init-declarator-list] ;

decl-specifier ::= storage-class-specifier | type-specifier | function-specifier | 

    friend | typedef

decl-specifier-seq ::= decl-specifier | decl-specifier-seq decl-specifier

storage-class-specifier ::= auto | register | static | extern | mutable

function-specifier ::= inline | virtual | explicit