(C++) SafeIntToCli

SafeIntToCli is a cln::cl_I conversion code snippets to convert an integer to a cln::cl_I safely.


#include <string>

#include <boost/lexical_cast.hpp>

//---------------------------------------------------------------------------

#include <cln/cln.h>

//---------------------------------------------------------------------------

///SafeIntToCli converts an int to cln::cl_I safely.

///From http://www.richelbilderbeek.nl/CppSafeIntToCli.htm

const cln::cl_I SafeIntToCli(const int i)

{

  //A cln::cl_I can handle integer values to 2^29 in its constructor

  if (i < 536870912)

  {

    return cln::cl_I(i);

  }

  const std::string s = boost::lexical_cast<std::string>(i);

  return cln::cl_I(s.c_str());

}

//---------------------------------------------------------------------------

#include <boost/numeric/conversion/bounds.hpp>

//---------------------------------------------------------------------------

///GetMaxInt returns the highest possible value of a int.

///From http://www.richelbilderbeek.nl/CppGetMaxInt.htm

int GetMaxInt()

{

  return boost::numeric::bounds<int>::highest();

}

//---------------------------------------------------------------------------

#include <iostream>

//---------------------------------------------------------------------------

int main()

{

  const cln::cl_I i(GetMaxInt()); //Will not work properly

  const cln::cl_I j = SafeIntToCli(GetMaxInt());

  std::cout

    << "i (wrong): " << i << '\n'

    << "j: " << j << '\n';

}

Screen output:


i (wrong): -1

j: 2147483647

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