ERC20-II.sol

Note

Split reference

This reference file was too long so it is split into multiple chunks. This is chunk number II.

This is a Solidity file that contains several key functions for an ERC20 token contract. These functions include minting and burning tokens, approving the transfer of tokens, spending allowances of tokens, and hooks for actions taken before and after token transfers. These functions are all internal and virtual, and they enforce several key requirements, such as non-zero addresses and sufficient balances or allowances for token transfers.

_mint

_mint(address account, uint256 amount) internal virtual

This function mints a specified amount of tokens to a given account. It emits a Transfer event to indicate the minting of tokens.

Parameters

account address: The address of the account where the tokens will be minted to.
amount uint256: The amount of tokens to be minted.

_burn

_burn(address account, uint256 amount) internal virtual

This function burns a specified amount of tokens from a given account. It emits a Transfer event to indicate the burning of tokens.

Parameters

account address: The address of the account from which the tokens will be burned.
amount uint256: The amount of tokens to be burned.

_approve

_approve(address owner, address spender, uint256 amount) internal virtual

This function sets a specified amount as the allowance of a spender over the tokens of an owner. It emits an Approval event to indicate the approval of the allowance.

Parameters

owner address: The address of the owner of the tokens.
spender address: The address of the spender who is approved to use the tokens.
amount uint256: The amount of tokens that the spender is approved to use.

_spendAllowance

_spendAllowance(address owner, address spender, uint256 amount) internal virtual

This function updates the allowance of a spender over the tokens of an owner based on a spent amount. It may emit an Approval event.

Parameters

owner address: The address of the owner of the tokens.
spender address: The address of the spender who is using the tokens.
amount uint256: The amount of tokens that the spender is using.

_beforeTokenTransfer

_beforeTokenTransfer(address from, address to, uint256 amount) internal virtual

This is a hook function that is called before any transfer of tokens, including minting and burning. It has no implementation in this file and is intended to be overridden in derived contracts.

Parameters

from address: The address of the account from which the tokens will be transferred.
to address: The address of the account to which the tokens will be transferred.
amount uint256: The amount of tokens to be transferred.

_afterTokenTransfer

_afterTokenTransfer(address from, address to, uint256 amount) internal virtual

This is a hook function that is called after any transfer of tokens, including minting and burning. It has no implementation in this file and is intended to be overridden in derived contracts.

Parameters

from address: The address of the account from which the tokens have been transferred.
to address: The address of the account to which the tokens have been transferred.
amount uint256: The amount of tokens that have been transferred.