Allow overrides of allowance in ERC20

OpenZeppelin · Aug 2, 2019 · c54a18a · c54a18a
1 parent 15ada12
commit c54a18a
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/contracts/token/ERC20/ERC20.sol b/contracts/token/ERC20/ERC20.sol
@@ -95,7 +95,7 @@ contract ERC20 is IERC20 {
      */
     function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
         _transfer(sender, recipient, amount);
-        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
+        _approve(sender, msg.sender, allowance(sender, msg.sender).sub(amount));
         return true;
     }
 
@@ -112,7 +112,7 @@ contract ERC20 is IERC20 {
      * - `spender` cannot be the zero address.
      */
     function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
-        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
+        _approve(msg.sender, spender, allowance(msg.sender, spender).add(addedValue));
         return true;
     }
 
@@ -131,7 +131,7 @@ contract ERC20 is IERC20 {
      * `subtractedValue`.
      */
     function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
-        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
+        _approve(msg.sender, spender, allowance(msg.sender, spender).sub(subtractedValue));
         return true;
     }
 
@@ -223,6 +223,6 @@ contract ERC20 is IERC20 {
      */
     function _burnFrom(address account, uint256 amount) internal {
         _burn(account, amount);
-        _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
+        _approve(account, msg.sender, allowance(account, msg.sender).sub(amount));
     }
 }