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[dcl.type.general]

9 Declarations [dcl]

9.2 Specifiers [dcl.spec]

9.2.9 Type specifiers [dcl.type]

9.2.9.1 General [dcl.type.general]

The attribute-specifier-seq affects the type only for the declaration it appears in, not other declarations involving the same type.

As a general rule, at most one defining-type-specifier is allowed in the complete decl-specifier-seq of a declaration or in a defining-type-specifier-seq, and at most one type-specifier is allowed in a type-specifier-seq.

The only exceptions to this rule are the following:

  • const can be combined with any type specifier except itself.

  • volatile can be combined with any type specifier except itself.

  • signed or unsigned can be combined with char, long, short, or int.

  • short or long can be combined with int.

  • long can be combined with double.

  • long can be combined with long.

Except in a declaration of a constructor, destructor, or conversion function, at least one defining-type-specifier that is not a cv-qualifier shall appear in a complete type-specifier-seq or a complete decl-specifier-seq.

[Note 1:

The remaining type-specifiers are discussed in the rest of [dcl.type].

— end note]