IERC20.sol
View Source: home/circleci/project/node_modules/@openzeppelin/contracts/token/ERC20/IERC20.sol
โ Derived Contracts: ERC20
Interface of the ERC20 standard as defined in the EIP.
Events
Functions
totalSupply
Returns the amount of tokens in existence.
Arguments
Name | Type | Description |
---|
balanceOf
Returns the amount of tokens owned by account
.
Arguments
Name | Type | Description |
---|---|---|
account | address |
transfer
Moves amount
tokens from the caller's account to recipient
.
Returns a boolean value indicating whether the operation succeeded.
Emits a {Transfer} event.
Arguments
Name | Type | Description |
---|---|---|
recipient | address | |
amount | uint256 |
allowance
Returns the remaining number of tokens that spender
will be
allowed to spend on behalf of owner
through {transferFrom}. This is
zero by default.
This value changes when {approve} or {transferFrom} are called.
Arguments
Name | Type | Description |
---|---|---|
owner | address | |
spender | address |
approve
Sets amount
as the allowance of spender
over the caller's tokens.
Returns a boolean value indicating whether the operation succeeded.
IMPORTANT: Beware that changing an allowance with this method brings the risk
that someone may use both the old and the new allowance by unfortunate
transaction ordering. One possible solution to mitigate this race
condition is to first reduce the spender's allowance to 0 and set the
desired value afterwards:
https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
Emits an {Approval} event.
Arguments
Name | Type | Description |
---|---|---|
spender | address | |
amount | uint256 |
transferFrom
Moves amount
tokens from sender
to recipient
using the
allowance mechanism. amount
is then deducted from the caller's
allowance.
Returns a boolean value indicating whether the operation succeeded.
Emits a {Transfer} event.
Arguments
Name | Type | Description |
---|---|---|
sender | address | |
recipient | address | |
amount | uint256 |