C++ named requirements: StandardLayoutType

Specifies that a type is standard layout type. Standard layout types are useful for communicating with code written in other programming languages.

Note: the standard doesn't define a named requirement with this name. This is a type category defined by the core language. It is included here as a named requirement only for consistency.

Requirements

• All non-static data members have the same access control
• Has no virtual functions or virtual base classes
• Has no non-static data members of reference type
• All non-static data members and base classes are themselves standard layout types

struct Q {};
struct S : Q { };
struct T : Q { };
struct U : S, T { };  // not a standard-layout class: two base class subobjects of type Q

struct B { int i; };         // standard-layout class
struct C : B { };            // standard-layout class
struct D : C { };            // standard-layout class
struct E : D { char : 4; };  // not a standard-layout class

Properties

See Standard layout.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

See also