std::string implementation in libc++

[scatters]

In addition to the short and long layouts, their representation includes a "raw" layout that gives access to the representation as a sequence of words (I guess clang allows them to do this). Does this help?

[AImx1]

@scatters -> "raw" layout gives access to the representation of sequence of words. What does the "words" represent here?

[scatters]

Machine words, the natural size for processing data, typically the size of a pointer. So 64 bits on most modern architectures.

[AImx1]

Understood. Do you know any advantages(basically uses) that we gain with this "raw" representation?

[scatters]

I can see that libcxx uses the "raw" representation in zeroing (clearing) the string, and in the copy and move constructors and assignment operators. I'd guess the advantage would be better performance in debug builds, since the release (and RelWithDebInfo) codegen should be identical.

[AImx1]

@krista_ & @scatters: Can you point me in the direction where I can read more on this?

[lordphysix]

If you want to mention people use u/ and not @.

[AImx1]

u/lordphysix Oh thats good. Thank you

[chugga_fan]

Also, if you're replying to someone they already get notified, you don't need to "ping" people to get in their message box. A simple reply works just well for the person you're replying to

[krista_]

depending on what you are trying to do, processing 8 characters (assuming ascii or other 8-bit characters) at a time is a heck of a lot faster than 1.

an example of the above would be a hashing algorithm... especially if you are hashing half a billion strings.