Mailman 3 Re: [C++-sig] pygccxml not picking up optional parameters in std::vector constructor - Cplusplus-sig

Dec. 28, 2007

      ----- Original Message ----
...
From: Nindi Singh <nindi73@yahoo.co.uk>
To: Development of Python/C++ integration <c++-sig@python.org>
Sent: Friday, 28 December, 2007 9:36:26 PM
Subject: Re: [C++-sig] pygccxml not picking up optional parameters in std::vector constructor
In my previous 2 emails, in my c++ code I instantiated vector with
template vector;
This is a typo and should have read
template class vector;
Secondly after a little further investigation
pygccxml script:
______________________________________________________________
import sys
from pygccxml import parser
from pygccxml import declarations
from pygccxml.declarations import templates
from pygccxml.declarations import type_traits
decls = parser.parse( ['example.hpp'])#, config )
global_ns = declarations.get_global_namespace( decls )
query = declarations.custom_matcher_t (lambda vec
:
templates.name(vec.name).endswith('vector'))
...
vectorClass = global_ns.classes(function=query)
def processArgument(arg):
    if type_traits.is_const(arg):
        return 'const
'+processArgument(type_traits.remove_const(arg))
+ ' '
...
if type_traits.is_reference(arg):
        return processArgument(type_traits.remove_reference(arg)) 
+
'&'
...
if type_traits.is_pointer(arg):
        return processArgument(type_traits.remove_pointer(arg))   + '*'
    if type_traits.is_fundamental(arg):
        return  str(arg)
    if type_traits.is_class(arg):
                theType = type_traits.remove_declarated(arg)
        return theType.demangled  
    if type_traits.is_class_declaration(arg):
                theType = type_traits.remove_declarated(arg)
        return theType.demangled
for class_ in vectorClass:
    theConstructors =  class_.constructors()
    for c in theConstructors:
        print '\n\n'
        print 'name         :',c.demangled
        print 'location     :',c.location.file_name
        if len(c.required_args)==0:
          print 'No required args'
        else :
          print 'required args:'
          for a in c.required_args:
            print ' ',processArgument(a.type)
        if len(c.optional_args)==0:
          print 'No optional args'
        else :
          print 'optional args:'
          for a in c.optional_args:
            print ' ',processArgument(a.type)
___________________________________________________________________
c++ header file:
___________________________________________________________________
#ifndef TESTVECTOR
#define TESTVECTOR
class egclass{};
template   
class vector {
  vector(unsigned long i, const egclass  = egclass()  ){}
};
class xvector {
  xvector(unsigned long i, const egclass  = egclass()  ){}
};
template class vector«double»;
#endif
__________________________________________________________________
The ouput is 
__________________________________________________________________
INFO Parsing source file "example.hpp" ...
INFO gccxml cmd: /usr/bin/gccxml  -I"."  
"example.hpp"
-fxml="/tmp/tmp7BA-U2.xml"
...
name         : xvector::xvector(xvector const&)
location     : /b/Papa/Workspace/pygccxmlTest/example.hpp
required args:
  const xvector &
No optional args
name         : xvector::xvector(unsigned long, egclass)
location     : /b/Papa/Workspace/pygccxmlTest/example.hpp
required args:
  long unsigned int
optional args:
  const egclass
name         : vector::vector(vector const&)
location     : /b/Papa/Workspace/pygccxmlTest/example.hpp
required args:
  const vector &
No optional args
name         : vector::vector(unsigned long, egclass)
location     : /b/Papa/Workspace/pygccxmlTest/example.hpp
required args:
  long unsigned int
  const egclass 
No optional args
___________________________________________________________________
So interestingly the problem is with templated classes.
Is this a problem with pygccxml or gccxml ?
I'll try to look at the xml file.
More progress.

I firstly checked out and built gccxml from cvs.
I then tried the same excerises as in my previous emails and got the same results.

Also I had a look at the resulting xml file from running gcccxml on example.hpp in
my last email.

These two lines looked intersting :
_____________________________________________________________________________________________________
<Constructor id="_138" name="vector" context="_40" access="private" mangled="_ZN6vectorIdEC1Em7egclass *INTERNAL* " demangled="vector<double>::vector(unsigned long, egclass)" location="f1:9" file="f1" line="9" inline="1">
    <Argument name="i" type="_149" location="f1:9" file="f1" line="9"/>
    <Argument type="_90c" location="f1:9" file="f1" line="9" default="<gccxml-cast-expr>"/>

    </Constructor>

    <Constructor id="_145" name="xvector" context="_89" access="private" mangled="_ZN7xvectorC1Em7egclass *INTERNAL* " demangled="xvector::xvector(unsigned long, egclass)" location="f1:13" file="f1" line="13" inline="1">
    <Argument name="i" type="_149" location="f1:13" file="f1" line="13"/>
    <Argument type="_90c" location="f1:13" file="f1" line="13" default="egclass()"/>
  </Constructor> 
______________________________________________________________________________________________________

The default values look interesting. gccxml does pick up that there is a default value
for the second parameter of the constructor in both the templated and non-templated classes.
However  <gccxml-cast-expr> is something I do not understand, it should be the same as egclass()
I suspect.
pygccxml does not pick this up at all and it doesn't show there being a default value where there is one.

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Re: [C++-sig] pygccxml not picking up optional parameters in std::vector constructor

Nindi Singh

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