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  "source": "// SPDX-License-Identifier: Apache-2.0\n\n/******************************************************************************\n * Copyright 2020 IEXEC BLOCKCHAIN TECH                                       *\n *                                                                            *\n * Licensed under the Apache License, Version 2.0 (the \"License\");            *\n * you may not use this file except in compliance with the License.           *\n * You may obtain a copy of the License at                                    *\n *                                                                            *\n *     http://www.apache.org/licenses/LICENSE-2.0                             *\n *                                                                            *\n * Unless required by applicable law or agreed to in writing, software        *\n * distributed under the License is distributed on an \"AS IS\" BASIS,          *\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   *\n * See the License for the specific language governing permissions and        *\n * limitations under the License.                                             *\n ******************************************************************************/\n\npragma solidity ^0.6.0;\n\nimport '@openzeppelin/contracts/utils/Address.sol';\nimport './Proxy.sol';\n\n/**\n * @title BaseUpgradeabilityProxy\n * @dev This contract implements a proxy that allows to change the\n * implementation address to which it will delegate.\n * Such a change is called an implementation upgrade.\n */\ncontract BaseUpgradeabilityProxy is Proxy {\n  /**\n   * @dev Emitted when the implementation is upgraded.\n   * @param implementation Address of the new implementation.\n   */\n  event Upgraded(address indexed implementation);\n\n  /**\n   * @dev Storage slot with the address of the current implementation.\n   * This is the keccak-256 hash of \"org.zeppelinos.proxy.implementation\", and is\n   * validated in the constructor.\n   */\n  bytes32 internal constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;\n\n  /**\n   * @dev Returns the current implementation.\n   * @return impl Address of the current implementation\n   */\n  function _implementation() internal override view returns (address impl) {\n    bytes32 slot = IMPLEMENTATION_SLOT;\n    assembly {\n      impl := sload(slot)\n    }\n  }\n\n  /**\n   * @dev Upgrades the proxy to a new implementation.\n   * @param newImplementation Address of the new implementation.\n   */\n  function _upgradeTo(address newImplementation) internal {\n    _setImplementation(newImplementation);\n    emit Upgraded(newImplementation);\n  }\n\n  /**\n   * @dev Sets the implementation address of the proxy.\n   * @param newImplementation Address of the new implementation.\n   */\n  function _setImplementation(address newImplementation) internal {\n    require(Address.isContract(newImplementation), \"Cannot set a proxy implementation to a non-contract address\");\n\n    bytes32 slot = IMPLEMENTATION_SLOT;\n\n    assembly {\n      sstore(slot, newImplementation)\n    }\n  }\n}\n",
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    "title": "BaseUpgradeabilityProxy",
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}