Creating a local memory child of a Unt256 global variable in Ethereum
In this article, we will explore the process of creating a local memory child of a “Uint256” global variable in Ethereum.
Understanding global variables and children of local memory
When working with variables in solidity (programming language used for intelligent Ethereum contracts), it is common to use “global” variables that can be accessed by all functions of the contract. However, these global variables may have problems when you need to share data between different functions or even different contracts.
The children of local memory of global variables serve as a safe and effective way to store and receive data, avoiding the expenses of updating global variables.
Creating a child of local memory
To create a copy of a local memory of a global variable Unt256, you can follow these steps:
- Access the global variable
: First, go to the global variable
Unt256 'using your address.
Solidity
// Obtain the address of the global variable Unt256
GlobalVaradDR Address = ContractDRRESFMYVARIABLE;
`
- Create a local memory block : Create a local memory block calling the word -chavethe date followed by the name of the variable and a underlined prefix. This will create a new empty memory slot.
`Solidity
// Create a local memory copy of the Global Variable Unt256
uint256 mylocalvar = 0;
`
- Store the value : Store the value of the global variableUnt256
in the local memory block using the word -chave followed by the name of the variable and a underlined prefix.
Solidity
// Define the value of the local variable Unt256
mylocalvar.date = globalvaraddr;
`
- Get the value
: To assume the value of the copy of local memory, you can use a process similar to the above.
Here are some example code to illustrate the concept:
Solidity
Pragma solidity ^0.8,0;
Mycontract contract {
UINT256 PUBLIC MYGLOBALVAR = 0;
… …
// Create a local memory copy of the Global Variable Unt256
Uint256 _Milocarvar;
Getmylocalvar () Public View Return (Unt256) {
Return _Milocalvar;
}
FUNI SETMYLOCALVAR (UINT256 VALUE) PUBLIC {
_Mylocalvar = VALUE;
}
}
`
Example of use of cases
Suppose you have a contract that needs to store and recover the current date and time record. You can use local children of global variables, such asUnt256 ‘, to achieve this without affecting other functions.
`Solidity
Pragma solidity ^0.8,0;
Mycontract contract {
Uint256 MycurrentTimstamp Public = 0;
… …
// Create Local Memory Memories of Global Variables of Unt256
UINT256 _MILOCALVAR1;
UINT256 _MILOCALVAR2;
GetCurenttimstamp () Public View Return (Unt256) {
Returns Mycurrentimestamp;
}
FUNCT SETMYLOCALVAR1 (UINT256) INTERNAL {VALUE
_Mylocalvar1 = VALUE;
}
FUNCT SETMYLOCALVAR2 (Uint256) Internal {Value
_Mylocalvar2 = VALUE;
}
}
`
In this example, we created local memory children of global variablesuint256_mylocalvar1 and _mylocalvar2`. These variables can be safely updated by contract functions without affecting other parts of the code base.
Conclusion
The creation of a local memory child of a “Uint256” global variable in Ethereum is a simple process that requires extra minimal effort. Understanding how to access, store and recover data from these variables, you can write more efficient and scalable intelligent contracts. Remember to always follow the best safety and maintenance practices when working with complex codes like this example.