Contract Functions
Key Functions in the Smart Contract
1. transfer
: Transfers tokens from the caller's account to the recipient.
Purpose: To allow a user to send tokens from their balance to another address.
Inputs:
recipient
: The address receiving the tokens.amount
: The number of tokens to transfer.
Outputs: Returns
true
if the transfer is successful.Logic: The function first checks if the sender has enough tokens, then deducts the specified amount from the sender’s balance and adds it to the recipient's balance. It also emits a
Transfer
event for transparency.
2. mint
: Allows the contract owner to mint new tokens and increase the total supply.
Purpose: To create (mint) new tokens and add them to the owner's balance, increasing the total token supply.
Inputs:
amount
: The number of tokens to be created and assigned to the owner's balance.
Outputs: No return value, but an event
Transfer
is emitted to reflect the minting process (from address0x0
to the owner).Logic: This function can only be called by the owner (enforced by the
onlyOwner
modifier). It adds the specifiedamount
of tokens to the owner's balance and emits aTransfer
event, treating it as if tokens were sent from the zero address to the owner.
3. burn
: Allows a user to burn tokens from their balance, reducing the total supply.
Purpose: To allow users to burn (destroy) tokens from their balance, reducing the total supply.
Inputs:
amount
: The number of tokens to burn.
Outputs: No return value, but emits a
Transfer
event indicating that the tokens were transferred to the zero address (indicating they are burned).Logic: The function checks that the caller has sufficient tokens to burn. If the condition is met, the specified amount is deducted from the user's balance, and the tokens are effectively destroyed. A
Transfer
event is emitted to indicate the burn process, with the destination address being0x0
.
4. balanceOf
: Returns the balance of a specified address.
Purpose: To provide a way for anyone to check the token balance of a specific address.
Inputs:
account
: The address whose balance is being queried.
Outputs: Returns the current token balance of the specified
account
.Logic: This is a simple read-only function (
view
) that does not modify the contract’s state. It looks up the balance of the given address in thebalances
mapping and returns the value.
5. transferFrom
: Allows an approved spender to transfer tokens on behalf of the token owner.
Purpose: To allow a third-party (spender) to transfer tokens on behalf of the token owner, given that they’ve been granted approval.
Inputs:
sender
: The address of the token owner who is authorizing the transfer.recipient
: The address receiving the tokens.amount
: The number of tokens to transfer.
Outputs: Returns
true
if the transfer is successful.Logic: The function first checks that the sender has approved enough tokens (
allowances
) for the caller (spender) to transfer on their behalf. It also ensures the sender has sufficient balance. Upon success, it transfers the tokens and updates the allowance. ATransfer
event is emitted for logging purposes.
6. approve
: Allows a token owner to approve a spender to transfer tokens on their behalf.
Purpose: To grant approval to a third-party (spender) to transfer tokens on behalf of the token owner.
Inputs:
spender
: The address of the entity authorized to transfer tokens.amount
: The number of tokens they are allowed to transfer.
Outputs: Returns
true
if the approval is successful.Logic: The function updates the
allowances
mapping, allowing the specifiedspender
to transfer up toamount
tokens from the caller's account. TheApproval
event is emitted to notify off-chain services of the approval.
Summary of Key Functions
Function | Purpose | Inputs | Outputs |
| Transfers tokens from the caller’s account to a recipient. |
|
|
| Allows the owner to mint new tokens and add them to their balance. |
| Emits a |
| Burns tokens from the caller's balance, reducing the total supply. |
| Emits a |
| Returns the token balance of a specified account. |
| Returns the balance as |
| Allows a spender to transfer tokens on behalf of the token owner if they have approval. |
|
|
| Approves a third-party spender to transfer tokens on behalf of the token owner. |
|
|
Each function serves a specific role in token management, ensuring that users can securely transfer, mint, burn, and authorize token transactions, all while maintaining transparency via events.
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