Enum TokenBalance 

pub enum TokenBalance {
    Erc20,
    External,
    Internal,
}

The ERC-20 balance source/destination for sellToken and buyToken.

Controls whether the CoW settlement contract transfers tokens via standard ERC-20 transferFrom or via the Balancer Vault’s internal balance system.

Example

use cow_rs::TokenBalance;

let balance = TokenBalance::Erc20;
assert_eq!(balance.as_str(), "erc20");
assert!(balance.is_erc20());

Variants

Erc20

Standard ERC-20 transfer (default).

External

Balancer Vault internal balance (sell side only).

Internal

Balancer Vault internal balance (buy side only).

Implementations

impl TokenBalance

pub const fn as_str(self) -> &'static str

Returns the lowercase string used by the CoW Protocol API.

Returns

"erc20", "external", or "internal".

pub fn eip712_hash(self) -> B256

Compute keccak256(self.as_str()) for EIP-712 struct hashing.

The EIP-712 order struct encodes the token balance kind as keccak256(bytes("erc20")) (or "external" / "internal").

Returns

A 32-byte B256 hash of the variant string.

pub const fn is_erc20(self) -> bool

Returns true if the standard ERC-20 transfer mode is used.

This is the default for most orders.

pub const fn is_external(self) -> bool

Returns true if the Balancer Vault external balance is used (sell side only).

pub const fn is_internal(self) -> bool

Returns true if the Balancer Vault internal balance is used (buy side only).

Trait Implementations

impl Clone for TokenBalance

fn clone(&self) -> TokenBalance

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TokenBalance

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TokenBalance

fn default() -> TokenBalance

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TokenBalance

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for TokenBalance

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for TokenBalance

fn eq(&self, other: &TokenBalance) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for TokenBalance

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<&str> for TokenBalance

fn try_from(s: &str) -> Result<Self, Self::Error>

Parse a CoW Protocol token balance kind from its API string.

Accepts "erc20", "external", or "internal".

type Error = CowError

The type returned in the event of a conversion error.

impl Copy for TokenBalance

impl Eq for TokenBalance

impl StructuralPartialEq for TokenBalance