marshal_load

static VALUE
nurat_marshal_load(VALUE self, VALUE a)
{
    VALUE num, den;

    rb_check_frozen(self);
    rb_check_trusted(self);

    Check_Type(a, T_ARRAY);
    if (RARRAY_LEN(a) != 2)
        rb_raise(rb_eArgError, "marshaled rational must have an array whose length is 2 but %ld", RARRAY_LEN(a));

    num = RARRAY_AREF(a, 0);
    den = RARRAY_AREF(a, 1);
    nurat_int_check(num);
    nurat_int_check(den);
    nurat_canonicalize(&num, &den);
    rb_ivar_set(self, id_i_num, num);
    rb_ivar_set(self, id_i_den, den);

    return self;
}