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Understand the error “No function or associated element called Create_Type” on Solana
As developers, construction applications on the Solana blockchain, it is not uncommon to meet errors related to the development of smart contracts. Such an error is the error “without function or associated element called Create_type”, which can occur when you try to use a personalized type defined in the Solana program.
The problem: Error E0599
In the proven code extract:
`Rest
Use Solana_Programmm :: Program_error :: {Error, Errorkind};
Use Solana_Programmm :: Pubkey :: Pubkey;
Use Solana_Type :: Create_type;
// Define your personalized type here
Pub FN Main () -> Result {
// Your program logic here ...
// create a new transaction with the personalized type
Let TX = Create_Type! (T) as & _, 10:64 am; // T is your personalized type, and "AS & _"
}
'
The error occurs because theCreate_Type function! Instead, you need to use the Program_error :: Errorkind :: Personalized type 'to manage this specific error.
Correction of error
To correct the error, you must define a personalized type, then use it when creating transactions. Here is an updated version of the code:
Rest
Use Solana_Programmm :: Program_error :: {Error, Errorkind};
Use Solana_Programmm :: Pubkey :: Pubkey;
Use STD :: Mem;
// Define your personalized type here
Pub FN Main () -> Result {
// create a new transaction with the personalized type
Let TX = Create_Type! (T) as & _, 10:64 am; // T is your personalized type, and "AS & _"
// Check if the transaction has been created successful
Match Tx {
OK (_) => Println! ("Transaction has been successful"),
Err (err) => error! ("Transaction failure", ERR),
}
}
'
Understand personalized types
In Solana, you can define personalized types to use the macroCreate_type!. This macro is used to generate code to create personalized types.
Here is a basic personalized example:
Rest
Use Solana_Type :: Create_type;
Type of Mycustom PUB type = U8;
'
With this definition, we can be there when creating transactions:
Rest
Pub FN Create_transaction () -> Result of the program {
// create a new transaction with the personalized type
Let TX = Mycustal type :: new (10);
ALL RIGHT(())
}
` ‘
Conclusion
In this article, we have seen how to correct the error “without function or associated element called Create_Type” on Solana. By defining your own personalized types and using them when creating transactions, you can create more complex applications on the blockchain.
Do not forget to always check the official documentation of Solana for the most up -to -date information on language and programming types.