{ "contractName": "TransferList", "abi": [], "metadata": 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数量，ERC20需要注意decimals\n uint256 amount;\n // 在数组中的索引\n uint256 idx;\n // 目的地址\n string to;\n }\n\n struct transferMap {\n // element hash => index\n mapping(bytes32 => uint256) map;\n // data array 单向增加\n element[] list;\n }\n\n function getHash(element e) internal pure returns (bytes32) {\n return\n keccak256(abi.encodePacked(e.from, e.tokenHash, e.amount, e.idx, e.to));\n }\n\n function existByIdx(transferMap storage self, uint256 _idx)\n internal\n view\n returns (bool)\n {\n if (_idx >= self.list.length) return false;\n return true;\n }\n\n function existByHash(transferMap storage self, bytes32 _hash)\n internal\n view\n returns (bool)\n {\n /**\n 如果没有这个长度判断，在第一次操作时会导致invalid opcode\n */\n if (self.list.length == 0) return false;\n element storage e = self.list[self.map[_hash]];\n return _hash == getHash(e);\n }\n\n // 增加跨链转账指令内容\n function insert(\n transferMap storage self,\n address _from,\n bytes32 _tokenHash,\n uint256 _amount,\n string _to\n ) internal returns (bytes32) {\n element memory e =\n element({\n from: _from,\n tokenHash: _tokenHash,\n amount: _amount,\n idx: self.list.length,\n to: _to\n });\n\n bytes32 _hash = getHash(e);\n require(!existByHash(self, _hash), \"same transfer data exist\");\n\n self.list.push(e);\n self.map[_hash] = e.idx;\n\n return _hash;\n }\n\n function count(transferMap storage self) internal view returns (uint256) {\n return self.list.length;\n }\n\n function getByIdx(transferMap storage self, uint256 _idx)\n internal\n view\n returns (TransferList.element)\n {\n require(existByIdx(self, _idx), \"index must small than current count\");\n return self.list[_idx];\n }\n\n function getByHash(transferMap storage self, bytes32 _hash)\n internal\n view\n returns (TransferList.element)\n {\n require(existByHash(self, _hash), \"hash does not exist\");\n return self.list[self.map[_hash]];\n }\n\n /**\n @dev 从指定位置返回多条（不多于count）地址记录,如果不足则空缺\n */\n function getList(\n transferMap storage self,\n uint256 from,\n uint256 _count\n ) 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