Examples of kodkod.ast.IntExpression.sum()

kodkod.ast.IntExpression.sum()
Returns an integer expression that is the sum of all values that this integer expression can take given the provided declarations. @return {e: IntExpression | e.decls = decls and e.intExpr = this }

    IntExpression ret = lookup(intExpr);
    if (ret!=null) return ret;  
    final Environment<Expression> oldRepEnv = repEnv; // skolemDepth < 0 at this point
    final Decls decls  = visit((Decls)intExpr.decls());
    final IntExpression expr = intExpr.intExpr().accept(this);
    ret =  (decls==intExpr.decls() && expr==intExpr.intExpr()) ? intExpr : expr.sum(decls);
    repEnv = oldRepEnv;
    return cache(intExpr,ret);
  }


  /*-------formulas---------*/

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    if (ret!=null) return ret;
  
    final Decls decls  = intExpr.decls().accept(this);
    final IntExpression expr = intExpr.intExpr().accept(this);
    ret =  (decls==intExpr.decls() && expr==intExpr.intExpr()) ? 
        intExpr : expr.sum(decls);
    return cache(intExpr,ret);
    }
    
    /** 
   * Calls lookup(intComp) and returns the cached value, if any.

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      }
      final Formula ans = (op==ExprQt.Op.SUM) ? null : cform(sub) ;
      final IntExpression ians = (op!=ExprQt.Op.SUM) ? null : cint(sub) ;
      for(Decl d: xvars) for(ExprHasName v: d.names) env.remove((ExprVar)v);
      if (op==ExprQt.Op.COMPREHENSION) return ans.comprehension(dd); // guards.size()==0, since each var has to be unary
      if (op==ExprQt.Op.SUM) return ians.sum(dd);                    // guards.size()==0, since each var has to be unary
      if (op==ExprQt.Op.SOME) {
         if (guards.size()==0) return ans.forSome(dd);
         guards.add(ans);
         return Formula.and(guards).forSome(dd);
      } else {

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