From 353285e5d96477b4abb86f7cde9187e84ed251ac Mon Sep 17 00:00:00 2001
From: Joseph Krug <joeykrug@gmail.com>
Date: Sat, 15 Jul 2017 11:37:35 -0700
Subject: [PATCH] Added Constant to SafeMath functions as they don't modify
 storage

---
 contracts/math/SafeMath.sol | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/contracts/math/SafeMath.sol b/contracts/math/SafeMath.sol
index dc05ba280..47b7db51b 100644
--- a/contracts/math/SafeMath.sol
+++ b/contracts/math/SafeMath.sol
@@ -6,25 +6,25 @@ pragma solidity ^0.4.11;
  * @dev Math operations with safety checks that throw on error
  */
 library SafeMath {
-  function mul(uint256 a, uint256 b) internal returns (uint256) {
+  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
     uint256 c = a * b;
     assert(a == 0 || c / a == b);
     return c;
   }
 
-  function div(uint256 a, uint256 b) internal returns (uint256) {
+  function div(uint256 a, uint256 b) internal constant returns (uint256) {
     // assert(b > 0); // Solidity automatically throws when dividing by 0
     uint256 c = a / b;
     // assert(a == b * c + a % b); // There is no case in which this doesn't hold
     return c;
   }
 
-  function sub(uint256 a, uint256 b) internal returns (uint256) {
+  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
     assert(b <= a);
     return a - b;
   }
 
-  function add(uint256 a, uint256 b) internal returns (uint256) {
+  function add(uint256 a, uint256 b) internal constant returns (uint256) {
     uint256 c = a + b;
     assert(c >= a);
     return c;