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Full Discussion: Mismatch free() / delete / delete [C++]
Operating Systems Linux Mismatch free() / delete / delete [C++] Post 302985066 by Corona688 on Friday 4th of November 2016 11:14:57 AM
Old 11-04-2016
Quote:
Originally Posted by SA_Palani
Based in the below now can you please tell why do i get mismatch delete in the valgrind report.
No, I can't, because I am not psychic.

I have already detailed a large number of wild guesses about why it might be.

Quote:
Now I suspect that is p1 getting the void pointer as a result of called function(Send)?
Inside the Send function get_SendData is assigned with NULL value.
Yes, that would do it. That would ruin the value of p1 in main.
Quote:
If p1 is void pointer , will this delete p1 work fine?
"On two occasions I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." --Charles Babbage

Quote:
I am not sure about how to deallocate the void pointer?Despite being searched in the internet ,I still didn't get the clear answer
You don't. You'll have to save the pointer somewhere else, so that send() doesn't mangle it.

Copying a pointer doesn't do anything weird to the memory being pointed to. A pointer is, more or less, nothing but an integer, its value is the only thing that matters to delete.

Code:
void *p2=(void *)p1;
send(p2); // p2 is mangled, p1 is okay
delete p1;

Last edited by Corona688; 11-04-2016 at 12:26 PM..
 

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LEARN ABOUT DEBIAN

jlessecho

LESSECHO(1)						      General Commands Manual						       LESSECHO(1)

NAME

       lessecho - expand metacharacters

SYNOPSIS

       lessecho [-ox] [-cx] [-pn] [-dn] [-mx] [-nn] [-ex] [-a] file ...

DESCRIPTION

       lessecho is a program that simply echos its arguments on standard output.  But any argument containing spaces is enclosed in quotes.

OPTIONS

       A summary of options is included below.

       -ox    Specifies "x" to be the open quote character.

       -cx    Specifies "x" to be the close quote character.

       -pn    Specifies "n" to be the open quote character, as an integer.

       -dn    Specifies "n" to be the close quote character, as an integer.

       -mx    Specifies "x" to be a metachar.

       -nn    Specifies "n" to be a metachar, as an integer.

       -ex    Specifies "x" to be the escape char for metachars.

       -fn    Specifies "n" to be the escape char for metachars, as an integer.

       -a     Specifies that all arguments are to be quoted.  The default is that only arguments containing spaces are quoted.

SEE ALSO

       less(1)

AUTHOR

       This manual page was written by Thomas Schoepf <schoepf@debian.org>, for the Debian GNU/Linux system (but may be used by others).

       Send bug reports or comments to bug-less@gnu.org.

							     Version 394: 03 Dec 2005						       LESSECHO(1)
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