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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 or new-type-id ([expr.new]), 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-declarator
defining-type-id:
defining-type-specifier-seq abstract-declarator
abstract-declarator:
ptr-abstract-declarator
noptr-abstract-declarator
ptr-abstract-declarator:
noptr-abstract-declarator
ptr-operator ptr-abstract-declarator
noptr-abstract-declarator:
noptr-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
..
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 1: 
int / int i int * / int *pi int *[3] / int *p[3] int (*)[3] / int (*p3i)[3] int *() / int *f() int (*)(double) / int (*pf)(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]
2
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[Note 1: 
A type can also be named by a typedef-name, which is introduced by a typedef declaration or alias-declaration ([dcl.typedef]).
— end note]

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