To specify type conversions explicitly, and as an argument of sizeof, alignof, new, or typeid, the name of a type shall be specified. This can be done with a type-id, which is syntactically a declaration for a variable or function of that type that omits the name of the entity.
type-id:
type-specifier-seq abstract-declaratoropt
abstract-declarator:
ptr-abstract-declarator
noptr-abstract-declaratoropt parameters-and-qualifiers trailing-return-type
abstract-pack-declarator
ptr-abstract-declarator:
noptr-abstract-declarator
ptr-operator ptr-abstract-declaratoropt
noptr-abstract-declarator:
noptr-abstract-declaratoropt parameters-and-qualifiers
noptr-abstract-declaratoropt [ constant-expressionopt ] attribute-specifier-seqopt
( ptr-abstract-declarator )
abstract-pack-declarator:
noptr-abstract-pack-declarator
ptr-operator abstract-pack-declarator
noptr-abstract-pack-declarator:
noptr-abstract-pack-declarator parameters-and-qualifiers
noptr-abstract-pack-declarator [ constant-expressionopt ] attribute-specifier-seqopt
...
It is possible to identify uniquely the location in the abstract-declarator where the identifier would appear if the construction were a declarator in a declaration. The named type is then the same as the type of the hypothetical identifier. [ Example:
int int * int *[3] int (*)[3] int *() int (*)(double)
name respectively the types “int,” “pointer to int,” “array of 3 pointers to int,” “pointer to array of 3 int,” “function of (no parameters) returning pointer to int,” and “pointer to a function of (double) returning int.” — end example ]
A type can also be named (often more easily) by using a typedef ([dcl.typedef]).
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