[okl4-developer] iguana cc

[Jorge Torres]

Hi,

Thank you both Alex and Ben, I now have a new operator, having a picocpp.h,
was simpler than I thought, here is the code, just in case someone ever
wants it (it seems to work):

/*  ----  okl4_release_1.4.1.1/libs/c/picocpp.h---- */
///////////////////////
//PICOCPP for iguana
//what: just new and its combinations
///////////////////////
#ifndef __PICOCPP_H__
#define    __PICOCPP_H__

extern "C" {
#include <stdlib.h>
}

#define XNEW(A)\
    void *p=0;\
    p=(void*)malloc(A);\
    return p;

#define XNEW_NOTHROW\
    void *p=0; \
    return p;

/*FIXME: THERE SHOULD BE A MEMORYSPACE std*/

struct nothrow_t {};
extern const nothrow_t nothrow;

inline void* operator new(size_t a) {
    XNEW(a)
}
inline void* operator new[](size_t a) {
    XNEW(a)
}
inline void operator delete (void *p){
    free(p);
}
inline void operator delete[] (void *p){
    free(p);
}
inline void* operator new (size_t size, nothrow_t &){
    XNEW_NOTHROW
}
inline void* operator new[] (size_t size, nothrow_t &nt){
    XNEW_NOTHROW
}
inline void operator delete(void* v, nothrow_t &){
    return;
}
inline void operator delete[](void* v, nothrow_t &nt){
    return;
}

#endif



On 5/27/07, Alex Webster <alexw at ok-labs.com> wrote:
>
> Hi Jorge,
>
> All you need to do is define a global operator new, and make sure that
> it gets linked with your program.  You could put it in a mini libc++.
> Of course you probably won't be able to throw exceptions for out of
> memory, unless you implement the necessary runtime support.
>
> Don't forget to implement the array versions (i.e., new[] and delete[]),
> the nothrow versions, the placement versions and all the relevant
> combinations of these.
>
>
> Alex
>
> On Sun, 2007-05-27 at 21:33 -0400, Jorge Torres wrote:
> > Hi Ben,
> >
> > Thank you, your extern C wraping advise  was exactly what I was
> > looking for,  if I only knew this a few minutes ago, I wouldn't have
> > cloned stdio.h with extern C for every function, hahaha :), not a big
> > deal anyway.
> >
> > The only thing I miss about C++ runtime, its the new method for memory
> > allocation, I think this is a little off topic for okl4, so feel free
> > to ignore this: I'm trying to get one NEW for my self, but for now the
> > best solution I've came up with was adding a new operator for each
> > class:
> >
> > #define NEW(TYPE) void * operator new (size_t a){    \
> >         void *p;                \
> >         p=(TYPE*)malloc(sizeof(TYPE));    \
> >         return p;                \
> >     }
> >
> > class bla{
> > .
> > .
> > public:
> > NEW(bla);
> > .
> > .
> > };
> > But I can't figure out how to make this in a much more general way,
> > something like inline new.
> > problem I have is on how can one guess what is itself's type so one
> > can do something like:
> > void *p=(guessed_itselftype *)malloc(sizeof(guessed_itselftype));
> > Anyhow, if someone has done this, I'll be happy to know how.
> >
> >
> > Thanks again,
> >
> > Jorge
> >
> >
> > On 5/27/07, Ben Leslie <benno at ok-labs.com> wrote:
> >         On Fri May 25, 2007 at 04:54:20 -0400, Jorge Torres wrote:
> >         >Hi okl4.org,
> >         >
> >         >I tried to change the example/manyelfsegs/src/main.c to
> >         main.cc, and I had
> >         >some linking problems with stdio.h, does someone knows what
> >         is the correct
> >         >way of doing this (iguana style :), my temporal solution was:
> >         >-----
> >         >at this new example/manyelfsegs/src/main.cc
> >         >#define CTOCPP extern "C"
> >         >#include <stdio.h>
> >         >------
> >         >and at libs/c/include/stdio.h
> >         >#ifndef CTOCPP
> >         >#define CTOCPP
> >         >#endif
> >         >.
> >         >.
> >         >CTOPCPP int printf(const char *, ...);
> >         >------
> >
> >
> >         Hi Jorge,
> >
> >         We don't really have a C++ runtime, but, if you are trying to
> >         use the
> >         C library runtime, within a C++ program you should wrap the
> >         include
> >         within an extern C block, e.g:
> >
> >
> >         """
> >
> >         extern C {
> >             #include <stdio.h>
> >         }
> >
> >
> >         """
> >
> > _______________________________________________
> > Developer mailing list
> > Developer at okl4.org
> > https://lists.okl4.org/mailman/listinfo/developer
>
>
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