Struct approveCall

pub struct approveCall {
    pub spender: Address,
    pub value: U256,
}

@dev Sets a value amount of tokens 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. Function with signature approve(address,uint256) and selector 0x095ea7b3.

function approve(address spender, uint256 value) external returns (bool);

Fields

spender: Address

value: U256

Trait Implementations

impl Clone for approveCall

fn clone(&self) -> approveCall

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl SolCall for approveCall

const SIGNATURE: &'static str = "approve(address,uint256)"

The function’s ABI signature.

const SELECTOR: [u8; 4]

The function selector: keccak256(SIGNATURE)[0..4]

type Parameters<'a> = (Address, Uint<256>)

The underlying tuple type which represents this type’s arguments.

type Token<'a> = <<approveCall as SolCall>::Parameters<'a> as SolType>::Token<'a>

The arguments’ corresponding [TokenSeq] type.

type Return = bool

The function’s return struct.

type ReturnTuple<'a> = (Bool,)

The underlying tuple type which represents this type’s return values.

type ReturnToken<'a> = <<approveCall as SolCall>::ReturnTuple<'a> as SolType>::Token<'a>

The returns’ corresponding [TokenSeq] type.

fn new<'a>(tuple: <Self::Parameters<'a> as SolType>::RustType) -> Self

Convert from the tuple type used for ABI encoding and decoding.

fn tokenize(&self) -> Self::Token<'_>

Tokenize the call’s arguments.

fn tokenize_returns(ret: &Self::Return) -> Self::ReturnToken<'_>

Tokenize the call’s return values.

fn abi_decode_returns(data: &[u8]) -> Result<Self::Return>

ABI decode this call’s return values from the given slice.

fn abi_decode_returns_validate(data: &[u8]) -> Result<Self::Return>

ABI decode this call’s return values from the given slice, with validation.

fn abi_encoded_size(&self) -> usize

The size of the encoded data in bytes, without its selector.

fn abi_decode_raw(data: &[u8]) -> Result<Self, Error>

ABI decode this call’s arguments from the given slice, without its selector.

fn abi_decode_raw_validate(data: &[u8]) -> Result<Self, Error>

ABI decode this call’s arguments from the given slice, without its selector, with validation.

fn abi_decode(data: &[u8]) -> Result<Self, Error>

ABI decode this call’s arguments from the given slice, with the selector.

fn abi_decode_validate(data: &[u8]) -> Result<Self, Error>

ABI decode this call’s arguments from the given slice, with the selector, with validation.

fn abi_encode_raw(&self, out: &mut Vec<u8>)

ABI encode the call to the given buffer without its selector.

fn abi_encode(&self) -> Vec<u8>

ABI encode the call to the given buffer with its selector.

fn abi_encode_returns(ret: &Self::Return) -> Vec<u8>

ABI encode the call’s return value.

fn abi_encode_returns_tuple<'a, E>(e: &'a E) -> Vec<u8>

where E: SolTypeValue<Self::ReturnTuple<'a>>,

ABI encode the call’s return values.