Annex A (informative) Grammar summary [gram]

A.10 Special member functions [gram.special]

conversion-function-id:
    operator conversion-type-id
conversion-type-id:
    type-specifier-seq conversion-declaratoropt
conversion-declarator:
    ptr-operator conversion-declaratoropt
ctor-initializer:
    : mem-initializer-list
mem-initializer-list:
    mem-initializer ...opt
    mem-initializer-list , mem-initializer ...opt
mem-initializer:
    mem-initializer-id ( expression-listopt )
    mem-initializer-id braced-init-list
mem-initializer-id:
    class-or-decltype
    identifier