Is there a C++11/14 alternative to __attribute__((packed))

Question

C++11 introduced a concept of standardized attribute syntax. I couldn't find the list of all supported attributes. Is there a C++11 attribute alternative to __attribute__((packed))?

e.g.

struct __attribute__((packed)) Pack {
   uint8_t field1;
   uint8_t field2;
};

Answer 1

Unfortunately, no. The attributes the standard currently defines are:

• [[noreturn]];
• [[carries_dependency]];
• [[deprecated]]/[[deprecated(reason)]];

Everything else is implementation-defined.