Hi -
What is wrong this implementation? I get a core dump at the free()
statement? Thanks
Rakesh
#include <ext/hash_map>
#include <iostream.h>
#include <ext/hash_set>
using namespace std;
using namespace __gnu_cxx;
struct eqstr
{
bool operator()(char* s1, char* s2) const
{
return strcmp(s1, s2) == 0;
}
};
int main()
{
char *s, *s1, *temp;
hash_set<char *, hash<char *>, eqstr> AddedPhrases;
hash_set<char*, hash<char*>, eqstr> ::iterator Iter1;
s = (char *)malloc(sizeof(char)*100);
strcpy(s, "apple");
AddedPhrases.insert(s);
s1 = (char *)malloc(sizeof(char)*100);
strcpy(s1, "absent");
AddedPhrases.insert(s1);
for (Iter1 = AddedPhrases.begin(); Iter1 != AddedPhrases.end();
Iter1++)
{
temp = *Iter1;
//printf("\nDeleting:%s:%d", temp, strlen(temp));
free(temp);
}
}
$ g++ test3.cpp
$ ./a.out
Deleting:apple:5
Deleting:absent:6
*** glibc detected *** ./a.out: double free or corruption (!prev):
0x09fa2310 ***
======= Backtrace: =========
/lib/libc.so.6[0x6b9f18]
/lib/libc.so.6(__libc_free+0x79)[0x6bd41d]
./a.out(__gxx_personality_v0+0x274)[0x804892c]
/lib/libc.so.6(__libc_start_main+0xdc)[0x66b7e4]
./a.out(__gxx_personality_v0+0x69)[0x8048721]
======= Memory map: ========
0053b000-00546000 r-xp 00000000 fd:00 38110218
/lib/libgcc_s-4.1.0-20060304.so.1
00546000-00547000 rwxp 0000a000 fd:00 38110218
/lib/libgcc_s-4.1.0-20060304.so.1
00549000-0062b000 r-xp 00000000 fd:00 19344300
/usr/lib/libstdc++.so.6.0.8
0062b000-0062f000 r-xp 000e2000 fd:00 19344300
/usr/lib/libstdc++.so.6.0.8
0062f000-00630000 rwxp 000e6000 fd:00 19344300
/usr/lib/libstdc++.so.6.0.8
00630000-00636000 rwxp 00630000 00:00 0
00639000-00652000 r-xp 00000000 fd:00 38110213 /lib/ld-2.4.so
00652000-00653000 r-xp 00018000 fd:00 38110213 /lib/ld-2.4.so
00653000-00654000 rwxp 00019000 fd:00 38110213 /lib/ld-2.4.so
00656000-00782000 r-xp 00000000 fd:00 38110214 /lib/libc-2.4.so
00782000-00785000 r-xp 0012b000 fd:00 38110214 /lib/libc-2.4.so
00785000-00786000 rwxp 0012e000 fd:00 38110214 /lib/libc-2.4.so
00786000-00789000 rwxp 00786000 00:00 0
0078b000-007ae000 r-xp 00000000 fd:00 38110217 /lib/libm-2.4.so
007ae000-007af000 r-xp 00022000 fd:00 38110217 /lib/libm-2.4.so
007af000-007b0000 rwxp 00023000 fd:00 38110217 /lib/libm-2.4.so
00974000-00975000 r-xp 00974000 00:00 0 [vdso]
08048000-0804c000 r-xp 00000000 fd:00 24674319 /home/oracle/a.out
0804c000-0804d000 rw-p 00003000 fd:00 24674319 /home/oracle/a.out
09fa2000-09fc3000 rw-p 09fa2000 00:00 0 [heap]
b7e00000-b7e21000 rw-p b7e00000 00:00 0
b7e21000-b7f00000 ---p b7e21000 00:00 0
b7fa8000-b7fac000 rw-p b7fa8000 00:00 0
bf897000-bf8ac000 rw-p bf897000 00:00 0 [stack]
Deleting:Xax:3Aborted
--
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