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authorAmir Bandeali <abandeali1@gmail.com>2018-07-27 08:18:43 +0800
committerAmir Bandeali <abandeali1@gmail.com>2018-08-17 08:31:21 +0800
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treec1b2bd707553004f87a959d93c9f15b3f09fd292 /packages/contracts/src/2.0.0/tokens/UnlimitedAllowanceToken/UnlimitedAllowanceToken.sol
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diff --git a/packages/contracts/src/2.0.0/tokens/UnlimitedAllowanceToken/UnlimitedAllowanceToken.sol b/packages/contracts/src/2.0.0/tokens/UnlimitedAllowanceToken/UnlimitedAllowanceToken.sol
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--- a/packages/contracts/src/2.0.0/tokens/UnlimitedAllowanceToken/UnlimitedAllowanceToken.sol
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@@ -1,68 +0,0 @@
-/*
-
- Copyright 2018 ZeroEx Intl.
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-
-*/
-
-pragma solidity 0.4.24;
-
-import "../ERC20Token/ERC20Token.sol";
-
-
-contract UnlimitedAllowanceToken is
- ERC20Token
-{
-
- uint256 constant internal MAX_UINT = 2**256 - 1;
-
- /// @dev ERC20 transferFrom, modified such that an allowance of MAX_UINT represents an unlimited allowance. See https://github.com/ethereum/EIPs/issues/717
- /// @param _from Address to transfer from.
- /// @param _to Address to transfer to.
- /// @param _value Amount to transfer.
- /// @return Success of transfer.
- function transferFrom(
- address _from,
- address _to,
- uint256 _value
- )
- external
- returns (bool)
- {
- uint256 allowance = allowed[_from][msg.sender];
- require(
- balances[_from] >= _value,
- "ERC20_INSUFFICIENT_BALANCE"
- );
- require(
- allowance >= _value,
- "ERC20_INSUFFICIENT_ALLOWANCE"
- );
- require(
- balances[_to] + _value >= balances[_to],
- "UINT256_OVERFLOW"
- );
- balances[_to] += _value;
- balances[_from] -= _value;
- if (allowance < MAX_UINT) {
- allowed[_from][msg.sender] -= _value;
- }
- emit Transfer(
- _from,
- _to,
- _value
- );
- return true;
- }
-}