cadical-sys 0.6.0

Almost complete safe and unsafe bindings for the CaDiCal SAT solver. Made using the cxx crate and then wrapped in a safe 1 to 1 API.
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#include "../../src/cadical.hpp"

#ifdef NDEBUG
#undef NDEBUG
#endif

#include <cstdlib>
#include <string>

using namespace std;
using namespace CaDiCaL;

static string path (const char *name) {
  const char *prefix = getenv ("CADICALBUILD");
  string res = prefix ? prefix : ".";
  res += "/test-api-apitrace-";
  res += name;
  res += ".trace";
  return res;
}

static FILE *trace (const char *name) {
  return fopen (path (name).c_str (), "w");
}

int main () {

  {
    FILE *file = trace ("file1");
    {
      Solver solver;
      solver.trace_api_calls (file);
    }
    fclose (file);
  }

  {
    setenv ("CADICAL_API_TRACE", path ("environment1").c_str (), 1);
    {
      Solver solver;
      solver.add (1);
      solver.add (2);
      solver.add (0);
      solver.solve ();
    }
    unsetenv ("CADICAL_API_TRACE");
  }

  {
    FILE *file = trace ("file2");
    {
      Solver solver;
      solver.trace_api_calls (file);
      solver.add (1);
      solver.add (0);
      solver.add (-1);
      solver.add (0);
      solver.solve ();
    }
    fclose (file);
  }

  {
    setenv ("CADICAL_API_TRACE", path ("environment2").c_str (), 1);
    {
      Solver solver;
      solver.add (-1);
      solver.add (-2);
      solver.add (0);
      solver.solve ();
    }
    unsetenv ("CADICAL_API_TRACE");
  }

  return 0;
}