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author | Leonid <logvinov.leon@gmail.com> | 2018-02-05 19:00:05 +0800 |
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committer | GitHub <noreply@github.com> | 2018-02-05 19:00:05 +0800 |
commit | f18fa8e9477b5a6e17216b292b70b3bd60a792ef (patch) | |
tree | 6c35f5a813f6bcba9559a7f78186a13c4f40bfbe /packages/contracts/src/previous/ERC20Token/ERC20Token_v1.sol | |
parent | 03b1b12ef1e4cdf9b834ff5cc1312b2eda3d2778 (diff) | |
parent | 44cd185c66b08a5a9b081c972e7cb6764c066506 (diff) | |
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Merge branch 'development' into feature/build_watch
Diffstat (limited to 'packages/contracts/src/previous/ERC20Token/ERC20Token_v1.sol')
-rw-r--r-- | packages/contracts/src/previous/ERC20Token/ERC20Token_v1.sol | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/packages/contracts/src/previous/ERC20Token/ERC20Token_v1.sol b/packages/contracts/src/previous/ERC20Token/ERC20Token_v1.sol new file mode 100644 index 000000000..e05ee2d5e --- /dev/null +++ b/packages/contracts/src/previous/ERC20Token/ERC20Token_v1.sol @@ -0,0 +1,44 @@ +pragma solidity ^0.4.11; + +import { Token_v1 as Token } from "../Token/Token_v1.sol"; + +contract ERC20Token_v1 is Token { + + function transfer(address _to, uint _value) returns (bool) { + //Default assumes totalSupply can't be over max (2^256 - 1). + if (balances[msg.sender] >= _value && balances[_to] + _value >= balances[_to]) { + balances[msg.sender] -= _value; + balances[_to] += _value; + Transfer(msg.sender, _to, _value); + return true; + } else { return false; } + } + + function transferFrom(address _from, address _to, uint _value) returns (bool) { + if (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; + } else { return false; } + } + + function balanceOf(address _owner) constant returns (uint) { + return balances[_owner]; + } + + function approve(address _spender, uint _value) returns (bool) { + allowed[msg.sender][_spender] = _value; + Approval(msg.sender, _spender, _value); + return true; + } + + function allowance(address _owner, address _spender) constant returns (uint) { + return allowed[_owner][_spender]; + } + + mapping (address => uint) balances; + mapping (address => mapping (address => uint)) allowed; + uint public totalSupply; +} |