Problem with isaac during compliation

[natman3400]

Since I first posted this in the beginners section, but was recommended to try a different section, ill just copy/paste what i had there.

When ever i try using the isaac template class (here: http://burtleburtle.net/bob/cplus/isaac.hpp)
I always seem to get this compile-time error:

[natman3400@nathan pixl]$ g++ main.cc -o main -lcryptopp
In file included from main.cc:8:0:
isaac.hpp: In member function ‘virtual void QTIsaac<ALPHA, T>::randinit(QTIsaac<ALPHA, T>::randctx*, bool)’:
isaac.hpp:162:14: error: name lookup of ‘i’ changed for ISO ‘for’ scoping [-fpermissive]
isaac.hpp:162:14: note: (if you use ‘-fpermissive’ G++ will accept your code)

trying -fpermissive gives me this:

[natman3400@nathan pixl]$ g++ main.cc -o main -lcryptopp -fpermissive
In file included from main.cc:8:0:
isaac.hpp: In member function ‘virtual void QTIsaac<ALPHA, T>::randinit(QTIsaac<ALPHA, T>::randctx*, bool)’:
isaac.hpp:162:14: warning: name lookup of ‘i’ changed for ISO ‘for’ scoping [-fpermissive]
isaac.hpp:153:15: warning:   using obsolete binding at ‘i’ [-fpermissive]

and this is the code i am trying to run:

#include </usr/include/cryptopp/sha.h>
#include <iostream>
#include <string>
#include </usr/include/cryptopp/hex.h>
#include <sstream>
#include </home/natman3400/pixl/BigIntegerLibrary.hh>
#include </home/natman3400/pixl/BigInteger.hh>
#include "isaac.hpp"
using namespace std;

int main()
{
 QTIsaac<8,ISAAC_INT> herp;
 std::string digest;
 std::string digest2;

CryptoPP::SHA512 hash;  // don't use MD5 anymore. It is considered insecure

// Thank you, Wei Dai, for making this possible:
string mystr;
cout << "Input the desired string to be hashed" << "\n";
getline (cin, mystr);
CryptoPP::StringSource foo(mystr, true,
   new CryptoPP::HashFilter(hash,
      new CryptoPP::HexEncoder (
         new CryptoPP::StringSink(digest))));
CryptoPP::StringSource foo2(mystr, true,
   new CryptoPP::HashFilter(hash,
         new CryptoPP::StringSink(digest2)));
char *derp = (char*)digest2.c_str();
for(int i =0;i<32;i++){
 derp[i]=(char)(abs((int)derp[i])); 
}
std::cout << derp << std::endl;
std::cout << digest << std::endl;
  
  return 0;
}

Thank you in advance for any help you can offer.

[Moschops]

I expect it builds with -fpermissive. Warnings do not stop it building.

[natman3400]

This makes me suspect i might have a problem with my g++, as it is not building(or at least not saving the file where i tell it too), ill try re-installing it.

[natman3400]

Some how doing a yum reinstall helped.
Problem solved.
Now how do i seed this thing...

[natman3400]

No I am on my laptop, and a different problem is arising:

/home/natman3400/cpp/res/isaac.hpp:80:60: error: ‘NULL’ was not declared in this scope
/home/natman3400/cpp/res/isaac.hpp: In constructor ‘QTIsaac<ALPHA, T>::randctx::randctx()’:
/home/natman3400/cpp/res/isaac.hpp:57:27: error: ‘::malloc’ has not been declared
/home/natman3400/cpp/res/isaac.hpp:58:27: error: ‘::malloc’ has not been declared
/home/natman3400/cpp/res/isaac.hpp: In destructor ‘QTIsaac<ALPHA, T>::randctx::~randctx()’:
/home/natman3400/cpp/res/isaac.hpp:63:13: error: ‘::free’ has not been declared
/home/natman3400/cpp/res/isaac.hpp:64:13: error: ‘::free’ has not been declared
/home/natman3400/cpp/res/isaac.hpp: In member function ‘virtual void QTIsaac<ALPHA, T>::srand(T, T, T, T*)’:
/home/natman3400/cpp/res/isaac.hpp:117:33: error: ‘NULL’ was not declared in this scope
/home/natman3400/cpp/res/isaac.hpp: In member function ‘virtual void QTIsaac<ALPHA, T>::randinit(QTIsaac<ALPHA, T>::randctx*, bool)’:
/home/natman3400/cpp/res/isaac.hpp:162:14: error: name lookup of ‘i’ changed for ISO ‘for’ scoping [-fpermissive]
/home/natman3400/cpp/res/isaac.hpp:162:14: note: (if you use ‘-fpermissive’ G++ will accept your code)

I have a feeling that this is something i am just missing due to my being new to c++

[natman3400]

Im really scratching my head with this one.

[bbgst]

The first problem is in the header you are including. If you look at it on line 162 as the compiler is telling you, you see:

for(i=0; i < N; i+=8)
// ... 

But the variable i haven't been declared before. It appears inside a for loop on line 153:

for(int i=0; i < 4; ++i)
// .. 

So you have to either edit the header file or use -fpermissive. But the problem is with the person who wrote it, not you.

Edit

Oh, and about the second error, add

#include <cstdlib>
using std::malloc;
using std::free;
using std::NULL; // not sure if this one is necessary 

before you include the header.