Bug 104831

Summary:	Compile errors in apps using Boost.Python in combination with G++ 3.2+due to missing 'typename'
Product:	[Retired] Red Hat Linux Beta	Reporter:	Dominique Devriese <devriese>
Component:	boost	Assignee:	Benjamin Kosnik <bkoz>
Status:	CLOSED NEXTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	beta1	CC:	mnewsome
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OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2004-12-02 16:24:51 UTC	Type:	---
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Description Dominique Devriese 2003-09-22 18:04:17 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (compatible; Konqueror/3.1; Linux)

Description of problem:
There is a known bug in the current Boost.Python releases, namely a missing 'typename' in /usr/include/boost/python/object/make_ptr_instance.hpp.  It affects almost all usage of the Boost.Python library, and is very annoying.

A very simple patch fixes this problem:  It can be paraphrased as replacing "is_polymorphic" by "typename is_polymorphic" on line 40 of make_ptr_instance.hpp.

diff -u -r python-old/object/make_ptr_instance.hpp python/object/make_ptr_instance.hpp
--- python-old/object/make_ptr_instance.hpp     2003-04-22 14:35:28.000000000 +0200
+++ python/object/make_ptr_instance.hpp 2003-06-28 15:09:05.000000000 +0200
@@ -34,7 +34,7 @@
     template <class U>
     static inline PyTypeObject* get_class_object_impl(U const volatile* p)
     {
-        PyTypeObject* derived = get_derived_class_object(is_polymorphic<U>::type(), p);
+        PyTypeObject* derived = get_derived_class_object(typename is_polymorphic<U>::type(), p);
         if (derived)
             return derived;
         return converter::registered<T>::converters.get_class_object();


This patch has also been applied by the Debian sid boost packagers.

Thanks for your work.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
Try to compile a simple boost.python application or module, using g++ 3.2 or later.	
    

Actual Results:  Compile error due to missing typename

Expected Results:  should have compiled fine.

Additional info:

Comment 1 Benjamin Kosnik 2004-04-05 22:17:17 UTC

This is fixed in boost-1.31.0-4, which is the current Red Hat package
for boost.

best,
benjamin