[Ethereum] Type casting msg.value to uint248

data-typesintegerssolidity

I am new to solidity programming and sorry if my question is very basic.

I am wondering if we can cast msg.value to uint248

Example below ;
uint value;
value = (uint248) (msg.value);

Best Answer

For casting, use value = uint248(msg.value);

Casting to save 8 bits in this case is not worth it and will probably cost more gas due to unpacking: see Why does uint8 cost more gas than uint256?

Even when using a struct of uint248 and uint8, it is best to actually test whether you are getting some gas savings.

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Solidity – Address Casting into Contract Implicit Conversion Explained

Casting a uint256 to a contract is an explicit cast, there is no secondary implicit cast. You are responsible for making sure no important data is lost when performing an explicit cast.

solidity – Casting Between Contract Classes in Solidity

This is the syntax you would use:

MyToken myToken = MyToken(address(token));

You have to do it like this because Solidity isn't actually an OOP language, it just has some features that make it feel kinda like it is.

Best Answer

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Solidity – Address Casting into Contract Implicit Conversion Explained

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