[Python-checkins] python/dist/src/Doc/api concrete.tex,1.68,1.69
lemburg@users.sourceforge.net
lemburg at users.sourceforge.net
Mon Oct 10 21:08:45 CEST 2005
Update of /cvsroot/python/python/dist/src/Doc/api
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv19085/Doc/api
Modified Files:
concrete.tex
Log Message:
Clarify the docs for Py_UNICODE.
Index: concrete.tex
===================================================================
RCS file: /cvsroot/python/python/dist/src/Doc/api/concrete.tex,v
retrieving revision 1.68
retrieving revision 1.69
diff -u -d -r1.68 -r1.69
--- concrete.tex 6 Oct 2005 20:29:57 -0000 1.68
+++ concrete.tex 10 Oct 2005 19:08:41 -0000 1.69
@@ -787,14 +787,24 @@
implementation in Python:
\begin{ctypedesc}{Py_UNICODE}
- This type represents a 16-bit unsigned storage type which is used by
- Python internally as basis for holding Unicode ordinals. On
- platforms where \ctype{wchar_t} is available and also has 16-bits,
- \ctype{Py_UNICODE} is a typedef alias for \ctype{wchar_t} to enhance
- native platform compatibility. On all other platforms,
- \ctype{Py_UNICODE} is a typedef alias for \ctype{unsigned short}.
+ This type represents the storage type which is used by Python
+ internally as basis for holding Unicode ordinals. Python's default
+ builds use a 16-bit type for \ctype{Py_UNICODE} and store Unicode
+ values internally as UCS2. It is also possible to build a UCS4
+ version of Python (most recent Linux distributions come with UCS4
+ builds of Python). These builds then use a 32-bit type for
+ \ctype{Py_UNICODE} and store Unicode data internally as UCS4. On
+ platforms where \ctype{wchar_t} is available and compatible with the
+ chosen Python Unicode build variant, \ctype{Py_UNICODE} is a typedef
+ alias for \ctype{wchar_t} to enhance native platform compatibility.
+ On all other platforms, \ctype{Py_UNICODE} is a typedef alias for
+ either \ctype{unsigned short} (UCS2) or \ctype{unsigned long}
+ (UCS4).
\end{ctypedesc}
+Note that UCS2 and UCS4 Python builds are not binary compatible.
+Please keep this in mind when writing extensions or interfaces.
+
\begin{ctypedesc}{PyUnicodeObject}
This subtype of \ctype{PyObject} represents a Python Unicode object.
\end{ctypedesc}
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