tuple.c

来自「压缩包里面的都是精致的基本C语言小程序」· C语言 代码 · 共 100 行

#include <stdio.h>
#include "mystdlib.h"
#include "error.h"
#include "tuple.h"

static int flag = 1;

struct tuple
{
  tyVft vft;
  
  poly x;
  poly y;
};

struct tyVft tupleVft;

tuple newTuple (poly x, poly y)
{
  if (flag)
  {
    flag--;
    tupleVft.equals = tupleEquals;
    tupleVft.getPlist = tupleGetPlist;
    tupleVft.hashCode = tupleHashCode;
    tupleVft.toString = tupleToString;
  }
  
  tuple t = checkedMalloc (sizeof (*t));

  t->vft = &tupleVft;
  
  t->x = x;
  t->y = y;
  return t;
}

poly tupleFirst (tuple t)
{
  return t->x;
}

poly tupleSecond (tuple t)
{
  return t->y;
}

int tupleEquals (poly t11, poly t12)
{
  tuple t1 = (tuple)t11;
  tuple t2 = (tuple)t12;
  
  tyEquals eqx = getVft (t1->x)->equals;
  tyEquals eqy = getVft (t1->y)->equals;
  return (eqx (t1->x, t2->x) && eqy (t1->y, t2->y));
}

int tupleEquals2 (tuple t1, tuple t2, tyEquals eqx, tyEquals eqy)
{
  return (eqx (t1->x, t2->x) && eqy (t1->y, t2->y));
}

str tupleToString (poly t1)
{
  tuple t = (tuple)t1;
  
  tyToString strx = getVft (t->x)->toString;
  tyToString stry = getVft (t->y)->toString;

  str s1 = newStr ("(");
  str s2 = strx (t->x);
  str s3 = newStr (", ");
  str s4 = stry (t->y);
  str s5 = newStr (")");
  // free all these stuff?

  return strConcat (s1, strConcat (s2, strConcat (s3, strConcat (s4, s5))));
}

plist tupleGetPlist (poly t)
{
  exception ("not implemented yet\n");
  return 0;
}

int tupleHashCode (poly t1)
{
  tuple t = (tuple)t1;
  
  tyHashCode h1 = getVft (t->x)->hashCode;
  tyHashCode h2 = getVft (t->y)->hashCode;
  
  int i1 = h1 (t->x);
  int i2 = h2 (t->y);
  
  return i1+i2;
}