Devinim,
I'm happy to answer your question.
>I am using some MFC classes with cint as following lines; and I don't wanna u
se
>MFC class as defined
>member (For example as pointer).
>
>#if !defined(__CINT__)
>class CChMenu : public CMenu
>#else
>class CChMenu
>#endif // !defined(__CINT__)
>{
>public:
> CChMenu();
> ~CChMenu();
>};
>
>... and to generate pre-compiled library script is;
>cint -w1 -zChWinLib -nG__cpp_ChWinLib.cxx -D__MAKECINT__ -c-1 -A ChMenu.h
>then when I compile it, get the error as;
>D:\Projects\ChWinLib\G__cpp_ChWinLib.cxx(580) : error C2558: class 'CChMenu'
: >no copy constructor
>available.
This is very trickly. I think this is because CMenu has private copy
constructor. Because of #if , CINT does not recognize that CMenu has private
copy constructor and generates stub function for CChMenu class. The compiler
assumes
CChMenu(CChMenu& x) : CMenu(x) { /*memberwise copy*/ }
which causes the problem.
>#if !defined(__CINT__)
>class CChMenu : public CMenu
>#else
>class CChMenu
>#endif // !defined(__CINT__)
>{
>public:
> CChMenu();
> CChMenu(CChMenu& menu);
> ~CChMenu();
>};
>compiler error solves but then the poblem occurs in cint;
This case, compiler assumes
CChMenu(CChMenu& x) : CMenu() { /*whatever defined in CChMenu ctor*/ }
which is fine.
>static int G__CChMenu_CChMenu_0_0(G__value *result7,char *funcname,struct
>G__param *libp,int hash) {
> CChMenu *p=NULL;
> if(G__getaryconstruct())
> if(G__PVOID==G__getgvp())
> p=new CChMenu[G__getaryconstruct()];
> else {
> for(int i=0;i<G__getaryconstruct();i++)
> p=new((void*)(G__getgvp()+sizeof(CChMenu)*i)) CChMenu;
> p=(CChMenu*)G__getgvp();
> }
> else p=new((void*)G__getgvp()) CChMenu;
>------------------>>>>>>>>>>>>>>>>>>>>>>>> Because
>G__getgvp() returns -1 always.
> result7->obj.i = (long)p;
> result7->ref = (long)p;
> result7->type = 'u';
> result7->tagnum = G__get_linked_tagnum(&G__LN_CChMenu);
> return(1 || funcname || hash || result7 || libp) ;
>}
>
>So I need to help :) at this point.
>The thrick I have been found to use as p=new CChMenu instead instead of
>p=new((void*)G__getgvp())
>CChMenu; but I am not sure to use it like correct way. But it works.
>What G__getgvp to do, I dunno exacly.
Getting -1 from G__getgvp() is fine. It should work that way. Overloaded
new operator will deal with the special value -1 and allocates memory for
the class. I do not know why this causes problem. There must be
static void* operator new(size_t size,void *p)
at the top of the dictionary source file. As long as this exists, it should
be fine.
Changing the line as
p=new CChMenu;
works as long as you do not instantiate CChMenu object as a class member
or a base class of an interpreted class.
class A { // interpreted class
CChMenu x; // This causes problem if you do p=new CChMenu
};
In this case, the member x must be part of A object whose memory is allocated
for A. When CINT calls CChMenu constructor, it gives already allocated memory
area by G__getgvp() access function. If you use 'new CChMenu', new memory area
will be allocated which is bad.
This kind of error happens with some library. Will you try -M0x10 option for
cint. Meaning -M option mask bit is described in doc/message.txt.
makecint -cint -M0x10 -mk Makefile -dl CChMenu.dll -H CChMenu.h
or
cint -w1 -zChWinLib -nG__cpp_ChWinLib.cxx -D__MAKECINT__ -c-1 -A -M0x10
ChMenu.h
Thank you
Masaharu Goto
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