{ "contractName": "Initializable", "abi": [], "metadata": "{\"compiler\":{\"version\":\"0.6.12+commit.27d51765\"},\"language\":\"Solidity\",\"output\":{\"abi\":[],\"devdoc\":{\"details\":\"This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}. CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.\",\"kind\":\"dev\",\"methods\":{},\"stateVariables\":{\"_initialized\":{\"details\":\"Indicates that the contract has been initialized.\"},\"_initializing\":{\"details\":\"Indicates that the contract is in the process of being initialized.\"}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"@openzeppelin/contracts-upgradeable/proxy/Initializable.sol\":\"Initializable\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"@openzeppelin/contracts-upgradeable/proxy/Initializable.sol\":{\"keccak256\":\"0xae7044b7c89ed74327b0979ae6f317c65d87b8d17a42d0c62d698d77d5de5511\",\"license\":\"MIT\",\"urls\":[\"bzz-raw://d676c978d8ecee5c4510f045b747d94f3a1381e39feb870d2675d5b6d45a371b\",\"dweb:/ipfs/QmUAokuHWPVAf14QkhPtSdYFyNa8HVje9CBEzwCcxH3xkP\"]}},\"version\":1}", "bytecode": "0x", "deployedBytecode": "0x", "immutableReferences": {}, "sourceMap": "", "deployedSourceMap": "", "source": "// SPDX-License-Identifier: MIT\n\n// solhint-disable-next-line compiler-version\npragma solidity >=0.4.24 <0.8.0;\n\n\n/**\n * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed\n * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an\n * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer\n * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.\n * \n * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as\n * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.\n * \n * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure\n * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.\n */\nabstract contract Initializable {\n\n /**\n * @dev Indicates that the contract has been initialized.\n */\n bool private _initialized;\n\n /**\n * @dev Indicates that the contract is in the process of being initialized.\n */\n bool private _initializing;\n\n /**\n * @dev Modifier to protect an initializer function from being invoked twice.\n */\n modifier initializer() {\n require(_initializing || _isConstructor() || !_initialized, \"Initializable: contract is already initialized\");\n\n bool isTopLevelCall = !_initializing;\n if (isTopLevelCall) {\n _initializing = true;\n _initialized = true;\n }\n\n _;\n\n if (isTopLevelCall) {\n _initializing = false;\n }\n }\n\n /// @dev Returns true if and only if the function is running in the constructor\n function _isConstructor() private view returns (bool) {\n // extcodesize checks the size of the code stored in an address, and\n // address returns the current address. Since the code is still not\n // deployed when running a constructor, any checks on its code size will\n // yield zero, making it an effective way to detect if a contract is\n // under construction or not.\n address self = address(this);\n uint256 cs;\n // solhint-disable-next-line no-inline-assembly\n assembly { cs := extcodesize(self) }\n return cs == 0;\n }\n}\n", "sourcePath": "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol", "ast": { "absolutePath": "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol", "exportedSymbols": { "Initializable": [ 8211 ] }, "id": 8212, "license": "MIT", "nodeType": "SourceUnit", "nodes": [ { "id": 8142, "literals": [ "solidity", ">=", "0.4", ".24", "<", "0.8", ".0" ], "nodeType": "PragmaDirective", "src": "79:32:16" }, { "abstract": true, "baseContracts": [], "contractDependencies": [], "contractKind": "contract", "documentation": { "id": 8143, "nodeType": "StructuredDocumentation", "src": "114:940:16", "text": " @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed\n behind a proxy. 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"nodeType": "VariableDeclaration", "overrides": null, "scope": 8210, "src": "1960:4:16", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" }, "typeName": { "id": 8191, "name": "bool", "nodeType": "ElementaryTypeName", "src": "1960:4:16", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "value": null, "visibility": "internal" } ], "src": "1959:6:16" }, "scope": 8211, "src": "1912:593:16", "stateMutability": "view", "virtual": false, "visibility": "private" } ], "scope": 8212, "src": "1055:1452:16" } ], "src": "79:2429:16" }, "compiler": { "name": "solc", "version": "0.6.12+commit.27d51765.Emscripten.clang" }, "networks": {}, "schemaVersion": "3.3.0", "updatedAt": "2021-01-17T13:45:27.192Z", "devdoc": { "details": "This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}. CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.", "kind": "dev", "methods": {}, "stateVariables": { "_initialized": { "details": "Indicates that the contract has been initialized." }, "_initializing": { "details": "Indicates that the contract is in the process of being initialized." } }, "version": 1 }, "userdoc": { "kind": "user", "methods": {}, "version": 1 } }