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Showing content from https://en.cppreference.com/w/cpp/language/../types/../named_req/StandardLayoutType.html below:

C++ named requirements: StandardLayoutType (since C++11)

Specifies that a type is a 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.

[edit] Requirements

The following types are collectively called standard-layout types:

scalar types
standard-layout class types
arrays of such types
cv-qualified versions of these types

[edit] Properties

See Standard-layout.

[edit] Defect reports

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

DR Applied to Behavior as published Correct behavior CWG 1672 C++11 first non-static data member rule ignored
existence of empty base classes first non-static data member rule
made recursive CWG 1813 C++11 class with a member defined in an indirect base
wasn't technically standard-layout all member declarations must be
in the same class CWG 2120 C++11 array as first member wasn't considered when
comparing the first element type with type of a base array members are considered [edit] See also

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