WebDec 16, 2024 · Likewise, packed enums should ideally just use a single register where possible. If it's a Result>, u8>, I could imagine the u8 just being shifted up 8 bits in the result to be aligned to a byte boundary, but the whole result still being packed in a single register, potentially giving a speed boost due to less register pressure. WebMay 26, 2010 · For C++11 and later, you can specify the underlying type of enum s. For example: enum BeNeLux : uint8_t { BELGIUM, NETHERLANDS, LUXEMBURG }; But this …
Attribute specifier sequence(since C++11) - cppreference.com
WebEnums should be consistent with the bit fields they initialize. Bit fields can only have integral or enumeration type. If it is quite straightforward to check if an integral type can initialize a bit field, it is however trickier with an enum type: the bit field has to be wide enough to store all the possible values of the enum. WebSep 15, 2024 · Up to 255 values seems to take up 8 bits of storage, and 256 values seems to take up 16 bits of storage. (I tested by putting other state variables next to the enum such that the last one would only fit if the enum was constrained to 8 bits.) @smarx: Well, this dude stated "Not taking into account struct tight packing", which IMO implies that ... the zoo oline streaming
Instantiating multidimensional array in system verilog
WebMar 25, 2024 · This makes sense - the compiler is padding the enum to be a multiple of 8 bytes. However, I still have a few questions. If I recall correctly, even 64 bit systems only use 48 bits (6 bytes) for addresses. Because of this, is there a way efficiently pack an enum of this sort into 64 bits? Such as: WebNov 5, 2024 · In reply to Thomas Kruse: No. If you are referring to the text in 7.2.1 Packed structures, a enum has a base type that is a packed type, such as int. And yes, there is a loophole in the strong typing if you declare an enum inside another packed type, you can assign it directly with an integral value. — Dave Rich, Verification Architect ... WebIn proto3, repeated fields of scalar numeric types use packed encoding by default. You can find out more about packed encoding in Protocol Buffer Encoding. ... For enums, the default value is the first defined enum value, which must be 0. For message fields, the field is not set. Its exact value is language-dependent. the zoo oklahoma city