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"source": "// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity 0.5.7;\n\nimport './BNum.sol';\nimport 'openzeppelin-solidity/contracts/token/ERC20/IERC20.sol';\n\n// Highly opinionated token implementation\n\n// interface IERC20 {\n// event Approval(address indexed src, address indexed dst, uint amt);\n// event Transfer(address indexed src, address indexed dst, uint amt);\n\n// function totalSupply() external view returns (uint);\n// function balanceOf(address whom) external view returns (uint);\n// function allowance(address src, address dst) external view returns (uint);\n\n// function approve(address dst, uint amt) external returns (bool);\n// function transfer(address dst, uint amt) external returns (bool);\n// function transferFrom(\n// address src, address dst, uint amt\n// ) external returns (bool);\n// }\n\ncontract BTokenBase is BNum {\n\n mapping(address => uint) internal _balance;\n mapping(address => mapping(address=>uint)) internal _allowance;\n uint internal _totalSupply;\n\n event Approval(address indexed src, address indexed dst, uint amt);\n event Transfer(address indexed src, address indexed dst, uint amt);\n\n function _mint(uint amt) internal {\n _balance[address(this)] = badd(_balance[address(this)], amt);\n _totalSupply = badd(_totalSupply, amt);\n emit Transfer(address(0), address(this), amt);\n }\n\n function _burn(uint amt) internal {\n require(\n _balance[address(this)] >= amt, \n 'ERR_INSUFFICIENT_BAL'\n );\n _balance[address(this)] = bsub(_balance[address(this)], amt);\n _totalSupply = bsub(_totalSupply, amt);\n emit Transfer(address(this), address(0), amt);\n }\n\n function _move(address src, address dst, uint amt) internal {\n require(_balance[src] >= amt, 'ERR_INSUFFICIENT_BAL');\n _balance[src] = bsub(_balance[src], amt);\n _balance[dst] = badd(_balance[dst], amt);\n emit Transfer(src, dst, amt);\n }\n\n function _push(address to, uint amt) internal {\n _move(address(this), to, amt);\n }\n\n function _pull(address from, uint amt) internal {\n _move(from, address(this), amt);\n }\n}\n\ncontract BToken is BTokenBase, IERC20 {\n\n string private _name = 'Balancer Pool Token';\n string private _symbol = 'BPT';\n uint8 private _decimals = 18;\n\n function name() public view returns (string memory) {\n return _name;\n }\n\n function symbol() public view returns (string memory) {\n return _symbol;\n }\n\n function decimals() public view returns(uint8) {\n return _decimals;\n }\n\n function allowance(address src, address dst) external view returns (uint) {\n return _allowance[src][dst];\n }\n\n function balanceOf(address whom) external view returns (uint) {\n return _balance[whom];\n }\n\n function totalSupply() public view returns (uint) {\n return _totalSupply;\n }\n\n function approve(address dst, uint amt) external returns (bool) {\n _allowance[msg.sender][dst] = amt;\n emit Approval(msg.sender, dst, amt);\n return true;\n }\n\n function increaseApproval(address dst, uint amt) external returns (bool) {\n _allowance[msg.sender][dst] = badd(_allowance[msg.sender][dst], amt);\n emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);\n return true;\n }\n\n function decreaseApproval(address dst, uint amt) external returns (bool) {\n uint oldValue = _allowance[msg.sender][dst];\n if (amt > oldValue) {\n _allowance[msg.sender][dst] = 0;\n } else {\n _allowance[msg.sender][dst] = bsub(oldValue, amt);\n }\n emit Approval(msg.sender, dst, _allowance[msg.sender][dst]);\n return true;\n }\n\n function transfer(address dst, uint amt) external returns (bool) {\n _move(msg.sender, dst, amt);\n return true;\n }\n\n function transferFrom(\n address src, \n address dst, \n uint amt\n ) \n external \n returns (bool) \n {\n require(\n msg.sender == src || amt <= _allowance[src][msg.sender], \n 'ERR_BTOKEN_BAD_CALLER'\n );\n _move(src, dst, amt);\n if (msg.sender != src && _allowance[src][msg.sender] != uint256(-1)) {\n _allowance[src][msg.sender] = bsub(_allowance[src][msg.sender], amt);\n emit Approval(msg.sender, dst, _allowance[src][msg.sender]);\n }\n return true;\n }\n}\n",
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