[ruby-core:73505] [Ruby trunk - Feature #12024] Add String.buffer, for creating strings with large capacities

Issue #12024 has been updated by Jeremy Evans.


I wasn't aware of #905 when I created this, I probably should have searched first.

This feature is similar to #905, but the implementation is different.  The implementation in #905 is an instance method that changes the capacity of an existing string.  This is a class method that creates a new string with the given capacity.  This does use the method name recommended by matz in #905, by accident, but I'm guessing that makes it a good name.

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Feature #12024: Add String.buffer, for creating strings with large capacities
https://bugs.ruby-lang.org/issues/12024#change-56722

* Author: Jeremy Evans
* Status: Open
* Priority: Normal
* Assignee: 
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If you know you are going to need to create a large string,
it's better to create it with a large capacity.  Otherwise,
ruby will need to continuously resize the string as it grows.
For example, if you will be producing a string that is
100000 bytes, String.buffer(100000) will avoid 10 separate
resizes compared to using String.new.

Performance-wise, String.new is 1.33x slower than
String.buffer(100000) if appending in 1000 byte chunks,
and 1.64x slower than String.buffer(1000) if appending
in 100 byte chunks.

To make sure this works correctly with String subclasses,
a static rb_str_buf_new_with_class function is added, which
both String.buffer and rb_str_buf_new now call.


---Files--------------------------------
0001-Add-String.buffer-for-creating-strings-with-large-ca.patch (3.53 KB)


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