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* README.EXT: should mention new macros: RSTRING_PTR, RSTRING_LEN,

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RARRAY_PTR, RARRAY_LEN.

* README.EXT.ja: ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10950 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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matz 2006-09-16 10:51:35 +00:00
parent 46799937ee
commit f208b3ad51
3 changed files with 16 additions and 8 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
Sat Sep 16 19:47:16 2006 Yukihiro Matsumoto <matz@ruby-lang.org>
* README.EXT: should mention new macros: RSTRING_PTR, RSTRING_LEN,
RARRAY_PTR, RARRAY_LEN.
* README.EXT.ja: ditto.
Sat Sep 16 16:39:23 2006 Nobuyoshi Nakada <nobu@ruby-lang.org>
* Makefile.in, common.in, instruby.rb, ext/extmk.rb, lib/mkmf.rb:

8
README.EXT
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@ -115,10 +115,10 @@ can be cast to retrieve the pointer to the struct. The casting macro
will be of the form RXXXX for each data type; for instance, RARRAY(obj).
See "ruby.h".
For example, `RSTRING(str)->len' is the way to get the size of the
Ruby String object. The allocated region can be accessed by
`RSTRING(str)->ptr'. For arrays, use `RARRAY(ary)->len' and
`RARRAY(ary)->ptr' respectively.
There are some accessing macros for structure members, for example
`RSTRING_LEN(s)' to to get the size of the Ruby String object. The
allocated region can be accessed by `RSTRING_PTR(str). For arrays, use
`RARRAY_LEN(ary) and `RARRAY_PTR(ary) respectively.
Notice: Do not change the value of the structure directly, unless you
are responsible for the result. This ends up being the cause of interesting

9
README.EXT.ja
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@ -129,10 +129,11 @@ obsolete
ruby.hでは構造体へキャストするマクロも「RXXXXX()」(全部大文
字にしたもの)という名前で提供されています(例: RSTRING())．
例えば，文字列strの長さを得るためには「RSTRING(str)->len」と
し，文字列strをchar*として得るためには「RSTRING(str)->ptr」
とします．配列の場合には，それぞれ「RARRAY(ary)->len」，
「RARRAY(ary)->ptr」となります．
構造体からデータを取り出すマクロが提供されています。文字列
strの長さを得るためには「RSTRING_LEN(str)」とし，文字列strを
char*として得るためには「RSTRING_PTR(str)」とします．配列の
場合には，それぞれ「RARRAY_LEN(ary)」，「RARRAY_PTR(ary)」と
なります．
Rubyの構造体を直接アクセスする時に気をつけなければならないこ
とは，配列や文字列の構造体の中身は参照するだけで，直接変更し