I took the code out of the bigger program and made another small program
to show the bug:
=====================================
#include <stdio.h>
#include <cstdlib>
#include <bitset>
#include <strings.h>
#include <string.h>
#include <iostream>
template <const int mysize,class mytype> const char * mybitset(mytype myobj){
return std::bitset<mysize>(myobj).to_string().c_str(); }
template <const int mysize> const char * mybitset2(int myobj){ return
std::bitset<mysize>(myobj).to_string().c_str(); }
#define bitsetvalue 0x255+0xf000
int main (int argc, char *argv[]) {
printf("COMPILER VERSION %s\n",__VERSION__);
printf("bitset 32 %s \n",std::bitset<32>(bitsetvalue).to_string().c_str());
printf("bitset 16 %s \n",std::bitset<16>(bitsetvalue).to_string().c_str());
printf("bitset 15 %s \n",std::bitset<15>(bitsetvalue).to_string().c_str());
printf("testing mybitset 32 %s \n",mybitset<32,int>(bitsetvalue));
printf("testing mybitset 16 %s \n",mybitset<16,int>(bitsetvalue));
printf("testing mybitset 15 %s \n",mybitset<15,int>(bitsetvalue));
printf("testing mybitset 15 %s \n",mybitset<15>(bitsetvalue));
printf("testing mybitset %s size %ld
\n",mybitset<32>(bitsetvalue),strlen(mybitset<32>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<32,int>(bitsetvalue),strlen(mybitset<32,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<4,int>(bitsetvalue),strlen(mybitset<4,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<8,int>(bitsetvalue),strlen(mybitset<8,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<12,int>(bitsetvalue),strlen(mybitset<12,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<15,int>(bitsetvalue),strlen(mybitset<15,int>(bitsetvalue)));
printf("testing mybitset %s size %ld
\n",mybitset<16,int>(bitsetvalue),strlen(mybitset<16,int>(bitsetvalue)));
printf("testing mybitset2 16 %s \n",mybitset2<16>(bitsetvalue));
printf("testing mybitset2 15 %s \n",mybitset2<15>(bitsetvalue));
}
=================
and the output gets:
$ g++ mybitsetsimple.cpp;./a.out
COMPILER VERSION 7.4.0
bitset 32 00000000000000001111001001010101
bitset 16 1111001001010101
bitset 15 111001001010101
testing mybitset 32
testing mybitset 16
testing mybitset 15 111001001010101
testing mybitset 15 111001001010101
testing mybitset size 0
testing mybitset size 0
testing mybitset 0101 size 4
testing mybitset 01010101 size 8
testing mybitset 001001010101 size 12
testing mybitset 111001001010101 size 15
testing mybitset size 0
testing mybitset2 16
testing mybitset2 15 111001001010101
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1829415
Title:
printing bitset to_string().c_str() in template produces junk
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gcc-7/+bug/1829415/+subscriptions
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