40 lines
1.1 KiB
Solidity
40 lines
1.1 KiB
Solidity
pragma solidity ^0.4.23;
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/**
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* @title DelegatedCall
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* @author Ricardo Guilherme Schmidt (Status Research & Development GmbH)
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* @dev Abstract contract that delegates calls by `delegated` modifier to result of `targetDelegatedCall()`
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* Important to avoid overwriting wrong storage pointers is that never define storage to this contract
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*/
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contract DelegatedCall {
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constructor() internal {
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}
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/**
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* @dev delegates the call of this function
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*/
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modifier delegated {
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//require successfull delegate call to remote `_target()`
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require(targetDelegatedCall().delegatecall(msg.data));
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assembly {
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let outSize := returndatasize
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let outDataPtr := mload(0x40) //load memory
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returndatacopy(outDataPtr, 0, outSize) //copy last return into pointer
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return(outDataPtr, outSize)
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}
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assert(false); //should never reach here
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_; //never will execute local logic
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}
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/**
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* @dev defines the address for delegation of calls
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*/
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function targetDelegatedCall()
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internal
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view
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returns(address);
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}
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