Delegate Call and Call

Solidity provides low-level functions to interact with other contracts.

1) Call

• Executes a function in another contract.
• msg.sender and msg.value are set to the calling contract.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

(bool success, ) = address(otherContract).call(
    abi.encodeWithSignature("someFunction(uint256)", 123)
);
require(success, "Call failed");

2) Delegatecall

• Executes code from another contract in the context of the calling contract.
• Keeps the storage, msg.sender, and msg.value of the calling contract.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

(bool success, ) = address(libraryContract).delegatecall(
    abi.encodeWithSignature("updateValue(uint256)", 100)
);
require(success, "Delegatecall failed");

• Useful for upgradable contracts, libraries, and proxy patterns.