Trait SolType

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pub trait SolType: Sized {
    type RustType: SolTypeValue<Self> + 'static;
    type Token<'a>: Token<'a>;

    const SOL_NAME: &'static str;
    const ENCODED_SIZE: Option<usize>;
    const PACKED_ENCODED_SIZE: Option<usize>;
    const DYNAMIC: bool = _;
Show 16 methods
    // Required methods
    fn valid_token(token: &Self::Token<'_>) -> bool;
    fn detokenize(token: Self::Token<'_>) -> Self::RustType;

    // Provided methods
    fn sol_type_name() -> Cow<'static, str> { ... }
    fn abi_encoded_size<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> usize { ... }
    fn type_check(token: &Self::Token<'_>) -> Result<()> { ... }
    fn tokenize<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Self::Token<'_> { ... }
    fn eip712_data_word<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Word { ... }
    fn abi_packed_encoded_size<E: ?Sized + SolTypeValue<Self>>(
        rust: &E,
    ) -> usize { ... }
    fn abi_encode_packed_to<E: ?Sized + SolTypeValue<Self>>(
        rust: &E,
        out: &mut Vec<u8>,
    ) { ... }
    fn abi_encode_packed<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Vec<u8> ⓘ { ... }
    fn abi_encode<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Vec<u8> ⓘ { ... }
    fn abi_encode_params<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Vec<u8> ⓘ
       where for<'a> Self::Token<'a>: TokenSeq<'a> { ... }
    fn abi_encode_sequence<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Vec<u8> ⓘ
       where for<'a> Self::Token<'a>: TokenSeq<'a> { ... }
    fn abi_decode(data: &[u8], validate: bool) -> Result<Self::RustType> { ... }
    fn abi_decode_params<'de>(
        data: &'de [u8],
        validate: bool,
    ) -> Result<Self::RustType>
       where Self::Token<'de>: TokenSeq<'de> { ... }
    fn abi_decode_sequence<'de>(
        data: &'de [u8],
        validate: bool,
    ) -> Result<Self::RustType>
       where Self::Token<'de>: TokenSeq<'de> { ... }
}

Expand description

A Solidity type.

This trait is implemented by types that contain ABI encoding and decoding info for Solidity types. Types may be combined to express arbitrarily complex Solidity types.

These types are zero cost representations of Solidity types. They do not exist at runtime. They only contain information about the type, they do not carry any data.

§Implementer’s Guide

It should not be necessary to implement this trait manually. Instead, use the sol! procedural macro to parse Solidity syntax into types that implement this trait.

§Examples

Basic usage:

use alloy_sol_types::{sol_data::*, SolType};

type Uint256DynamicArray = Array<Uint<256>>;
assert_eq!(Uint256DynamicArray::sol_type_name(), "uint256[]");

type Erc20FunctionArgs = (Address, Uint<256>);
assert_eq!(Erc20FunctionArgs::sol_type_name(), "(address,uint256)");

type LargeComplexType = (FixedArray<Array<Bool>, 2>, (FixedBytes<13>, String));
assert_eq!(LargeComplexType::sol_type_name(), "(bool[][2],(bytes13,string))");

The previous example can be entirely replicated with the sol! macro:

use alloy_sol_types::{sol, SolType};

type Uint256DynamicArray = sol!(uint256[]);
assert_eq!(Uint256DynamicArray::sol_type_name(), "uint256[]");

type Erc20FunctionArgs = sol!((address, uint256));
assert_eq!(Erc20FunctionArgs::sol_type_name(), "(address,uint256)");

type LargeComplexType = sol!((bool[][2],(bytes13,string)));
assert_eq!(LargeComplexType::sol_type_name(), "(bool[][2],(bytes13,string))");

For more complex usage, it’s recommended to use the SolValue trait for primitive types, and the Sol* traits for other types created with sol!:

use alloy_primitives::Address;
use alloy_sol_types::{sol, SolCall, SolStruct, SolValue};

sol! {
    struct MyStruct {
        bool a;
        uint64 b;
        address c;
    }

    enum MyEnum {
        A,
        B,
        C,
    }

    function myFunction(MyStruct my_struct, MyEnum my_enum);
}

// `SolValue`
let my_bool = true;
let _ = my_bool.abi_encode();

let my_struct = MyStruct { a: true, b: 1, c: Address::ZERO };
let _ = my_struct.abi_encode();

let my_enum = MyEnum::A;
let _ = my_enum.abi_encode();

// `SolCall`
let my_function_call = myFunctionCall { my_struct, my_enum };
let _ = my_function_call.abi_encode();

Required Associated Constants§

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const SOL_NAME: &'static str

The name of this type in Solidity.

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const ENCODED_SIZE: Option<usize>

The statically-known ABI-encoded size of the type.

If this is not known at compile time, this should be None, which indicates that the encoded size is dynamic.

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const PACKED_ENCODED_SIZE: Option<usize>

The statically-known Non-standard Packed Mode ABI-encoded size of the type.

If this is not known at compile time, this should be None, which indicates that the encoded size is dynamic.

Provided Associated Constants§

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const DYNAMIC: bool = _

Whether the ABI-encoded size is dynamic.

There should be no need to override the default implementation.

Required Associated Types§

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type RustType: SolTypeValue<Self> + 'static

The corresponding Rust type.

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type Token<'a>: Token<'a>

The corresponding ABI token type.

This is the intermediate representation of the type that is used for ABI encoding and decoding.

Required Methods§

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fn valid_token(token: &Self::Token<'_>) -> bool

Returns true if the given token can be detokenized with this type.

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fn detokenize(token: Self::Token<'_>) -> Self::RustType

Detokenize this type’s value from the given token.

See the abi::token module for more information.

Provided Methods§

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fn sol_type_name() -> Cow<'static, str>

👎Deprecated since 0.6.3: use SOL_NAME instead

Returns the name of this type in Solidity.

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fn abi_encoded_size<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> usize

Calculate the ABI-encoded size of the data, counting both head and tail words. For a single-word type this will always be 32.

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fn type_check(token: &Self::Token<'_>) -> Result<()>

Returns an error if the given token cannot be detokenized with this type.

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fn tokenize<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Self::Token<'_>

Tokenizes the given value into this type’s token.

See the abi::token module for more information.

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fn eip712_data_word<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Word

Encode this data according to EIP-712 encodeData rules, and hash it if necessary.

Implementer’s note: All single-word types are encoded as their word. All multi-word types are encoded as the hash the concatenated data words for each element

https://eips.ethereum.org/EIPS/eip-712#definition-of-encodedata

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fn abi_packed_encoded_size<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> usize

Returns the length of this value when ABI-encoded in Non-standard Packed Mode.

See abi_encode_packed for more details.

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fn abi_encode_packed_to<E: ?Sized + SolTypeValue<Self>>( rust: &E, out: &mut Vec<u8>, )

Non-standard Packed Mode ABI encoding.

See abi_encode_packed for more details.

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fn abi_encode_packed<E: ?Sized + SolTypeValue<Self>>(rust: &E) -> Vec<u8> ⓘ

Non-standard Packed Mode ABI encoding.

This is different from normal ABI encoding:

types shorter than 32 bytes are concatenated directly, without padding or sign extension;
dynamic types are encoded in-place and without the length;
array elements are padded, but still encoded in-place.

More information can be found in the Solidity docs.

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