function

declaration := function-defn

function-defn ::= [decl-specifier-seq] declarator [ctor-initializer] function-body |

    [decl-specifier-seq] declarator function-try-block

function-body ::= compound-statement

function-try-block ::= try [ctor-initializer] function-body handler-seq

ctor-initializer ::= : member-initializer-list

member-initializer-list ::= member-initializer | 

    member-initializer-list , member-initializer

member-initializer ::= member-initializer-id ( [expr-list] )

member-initializer-id ::= identifier | [::] [nested-name ::] class-name