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Message: [QUOTE="Johannes Schaub (litb), post: 3967087"] Aggregates but not PODs, both in C++03 and C++0x: string foo[10]; struct bar { string baz; }; In C++0x, you can use memcpy on trivially copyable types. POD is too strict a requirement for this - so if you just want to use memcpy on a type for example, making a type trivially copyable would suffice, in particular: - has no non-trivial copy constructors (12.8), â€” has no non-trivial copy assignment operators (13.5.3, 12.8), and â€” has a trivial destructor (12.4). A trivial class then is a class that is trivially copyable and that has a trivial default constructor. F is trivial and G is trivially copyable: struct F { Foo() = default; F(int a):a(a) { } int a; }; struct G { Foo(int a):a(a) { } int a; }; For other things, a class has to be a standard layout class. Thus is true for "offsetof", to inspect a common initial sequence when two such structs are in an union, etc. Look up the details in the latest draft at 9/6. A POD is a class is trivial and a standard layout class and has no members of non-POD etc... . Actually, i haven't found something in the c++0x language in 2960 that still requires things to be PODs. Things either seem to refer to standard layout classes or trivially copyable. [/QUOTE]