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author | Amir Bandeali <abandeali1@gmail.com> | 2018-02-02 07:48:06 +0800 |
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committer | Amir Bandeali <abandeali1@gmail.com> | 2018-02-03 01:39:08 +0800 |
commit | d5d6079b673d0a6d311f349dba291da18c846d9e (patch) | |
tree | b87cb20d4ce387cd35316d2785c3ab8968c51911 /packages/contracts/src/current/tokens/ERC20Token/ERC20Token.sol | |
parent | bb4c8bf8eb8c347900980d92534b19a3a80c690b (diff) | |
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Rename directories
Diffstat (limited to 'packages/contracts/src/current/tokens/ERC20Token/ERC20Token.sol')
-rw-r--r-- | packages/contracts/src/current/tokens/ERC20Token/ERC20Token.sol | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/packages/contracts/src/current/tokens/ERC20Token/ERC20Token.sol b/packages/contracts/src/current/tokens/ERC20Token/ERC20Token.sol new file mode 100644 index 000000000..0e5b87aa4 --- /dev/null +++ b/packages/contracts/src/current/tokens/ERC20Token/ERC20Token.sol @@ -0,0 +1,58 @@ +pragma solidity ^0.4.18; + +import { Token } from "../Token/Token.sol"; + +contract ERC20Token is Token { + + function transfer(address _to, uint _value) + public + returns (bool) + { + require(balances[msg.sender] >= _value && balances[_to] + _value >= balances[_to]); + balances[msg.sender] -= _value; + balances[_to] += _value; + Transfer(msg.sender, _to, _value); + return true; + } + + function transferFrom(address _from, address _to, uint _value) + public + returns (bool) + { + require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value >= balances[_to]); + balances[_to] += _value; + balances[_from] -= _value; + allowed[_from][msg.sender] -= _value; + Transfer(_from, _to, _value); + return true; + } + + function approve(address _spender, uint _value) + public + returns (bool) + { + allowed[msg.sender][_spender] = _value; + Approval(msg.sender, _spender, _value); + return true; + } + + function balanceOf(address _owner) + public + view + returns (uint) + { + return balances[_owner]; + } + + function allowance(address _owner, address _spender) + public + view + returns (uint) + { + return allowed[_owner][_spender]; + } + + mapping (address => uint) balances; + mapping (address => mapping (address => uint)) allowed; + uint public totalSupply; +} |