I already figured out how to replace new & delete operators, which
wasn't that hard and this is working great globally.
However, aside from new & delete, memory allocation is also used via
calling malloc/calloc & free functions.
What is the proper way to override these functions globally, not from
inside the class?
When I simply replace it like:
file: mysrcfile.c
----------------------------------------------
void free( void *memblock ) {
static fGuard = 0;
if( !fGuard )
{
fGuard = 1;
printf("free: block count=%i\n", --nMemBlocks);
fGuard = 0;
}
::free( memblock );
}
-----------------------------------------------
I get a link error:
LIBCD.lib(dbghe ap.obj) : error LNK2005: _free already defined in
mysrcfile.obj 4 2291
"Office Drone" <fu**********@y ahoo.com> wrote in message However, aside from new & delete, memory allocation is also used via calling malloc/calloc & free functions.
What is the proper way to override these functions globally, not from inside the class?
There's no way, which is one reason why you should always use new / delete
when writing C++.
What you have to do is write your own mymalloc() / myfree() and then trawl
through the code looking for calls. I have done this myself for large
programs, generally it isn't such a big job.
In article <68************ **************@ posting.google. com>,
Office Drone <fu**********@y ahoo.com> wrote: However, aside from new & delete, memory allocation is also used via calling malloc/calloc & free functions.
What is the proper way to override these functions globally, not from inside the class?
It sounds like you're using C++, but - since you posted in comp.lang.c -
there's no portable way to do it in C.
Your linker may have a way to resolve the conflict, but even if it
does this may not work if other library functions rely on the internal
workings of malloc.
You could #define malloc (etc) to be my_malloc (etc) in each file
(*after* the standard headers, and you should also #undef malloc
first, in case <stdlib.h> defined it as a macro). This will of course
have no effect on calls to malloc from other library functions.
(Language lawyers: is this legal?)
-- Richard ri*****@cogsci. ed.ac.uk (Richard Tobin) writes: You could #define malloc (etc) to be my_malloc (etc) in each file (*after* the standard headers, and you should also #undef malloc first, in case <stdlib.h> defined it as a macro). This will of course have no effect on calls to malloc from other library functions. (Language lawyers: is this legal?)
Not in C. Standard library function names are reserved.
Defining a reserved identifier as a macro name yields undefined
behavior. See C99 7.1.3#2. There is a special dispensation for
*un*defining certain reserved identifiers, but no corresponding
exception for defining them.
I can't speak for C++.
--
Ben Pfaff
email: bl*@cs.stanford .edu
web: http://benpfaff.org
Ben Pfaff <bl*@cs.stanfor d.edu> wrote in message news:<87******* *****@benpfaff. org>... ri*****@cogsci. ed.ac.uk (Richard Tobin) writes:
You could #define malloc (etc) to be my_malloc (etc) in each file (*after* the standard headers, and you should also #undef malloc first, in case <stdlib.h> defined it as a macro). This will of course have no effect on calls to malloc from other library functions. (Language lawyers: is this legal?)
Not in C. Standard library function names are reserved. Defining a reserved identifier as a macro name yields undefined behavior. See C99 7.1.3#2. There is a special dispensation for *un*defining certain reserved identifiers, but no corresponding exception for defining them.
I can't speak for C++.
I could limit the code to C++ notation (since I will be using classes
anyway), so the redefinition via #define sounds like a good solution.
I also tried to use a namespace (which is also C++ - specific, as far
as I understand), but the following crashes during the compilation:
namespace {
void free( void *memblock ) {
static fGuard = 0;
if( !fGuard )
{
fGuard = 1;
printf("free: block count=%i\n", cBlocksAllocate d--);
::free( memblock );
printf("freed: %p\n", memblock);
fGuard = 0;
} //if
} // free
} // unnamed namespace
void* iPtr = calloc( 1, 4096 );
free ( iPtr );
--------------
that bombs out with an error
'free' : ambiguous call to overloaded function This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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