CVL Functions

A CVL Function provides basic encapsulation for code reuse in a specification. If there is a common set of assumptions or assertions used in several rules, a CVL Function would be an apt place to group those together. Additionally they can be used for basic calculations.


Function with no return:

function my_function(address a, uint256 n) {
  require isValidAddress(a);
  require balance(a) >= n;

Function with a return:

function abs_value_difference(uint256 x, uint256 y) returns uint256 {
  if (x < y) {
    return y - x;
  } else {
    return x - y;

Using a CVL Function

CVL Function may be called from within a rule, or from within another CVL Function.