eth/eth_constants.hpp¶

Namespaces¶

Name
eth

Attributes¶

	Name
size_t	kAbiWordSize EVM ABI encoding constants (ABI spec: https://docs.soliditylang.org/en/latest/abi-spec.html).
size_t	kAbiAddressSize Ethereum address is 20 bytes.
size_t	kAbiAddressPadding 12 bytes of left-padding
size_t	kAbiBoolByteIndex Canonical bool lives in rightmost byte (index 31).
uint8_t	kRlpListPrefixMin EVM / RLP encoding thresholds.
size_t	kTypedTxPrefixSize EIP-2718 typed transaction envelope.
uint64_t	kDefaultChainId Default chain ID used when none is specified (Ethereum mainnet).
size_t	kKeccak256Size Keccak-256 digest size (bytes).

Attributes Documentation¶

variable kAbiWordSize¶

static size_t kAbiWordSize = 32;

EVM ABI encoding constants (ABI spec: https://docs.soliditylang.org/en/latest/abi-spec.html).

Every ABI head/tail slot is 32 bytes

variable kAbiAddressSize¶

static size_t kAbiAddressSize = 20;

Ethereum address is 20 bytes.

variable kAbiAddressPadding¶

static size_t kAbiAddressPadding = kAbiWordSize - kAbiAddressSize;

12 bytes of left-padding

variable kAbiBoolByteIndex¶

static size_t kAbiBoolByteIndex = kAbiWordSize - 1;

Canonical bool lives in rightmost byte (index 31).

variable kRlpListPrefixMin¶

static uint8_t kRlpListPrefixMin = 0xC0U;

EVM / RLP encoding thresholds.

First byte >= 0xC0 signals an RLP list

variable kTypedTxPrefixSize¶

static size_t kTypedTxPrefixSize = 1;

EIP-2718 typed transaction envelope.

One type-byte precedes the RLP payload

variable kDefaultChainId¶

static uint64_t kDefaultChainId = 1ULL;

Default chain ID used when none is specified (Ethereum mainnet).

variable kKeccak256Size¶

static size_t kKeccak256Size = 32;

Keccak-256 digest size (bytes).

Source code¶

// Copyright 2025 GeniusVentures
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include <cstddef>
#include <cstdint>

namespace eth {

static constexpr size_t  kAbiWordSize            = 32;   
static constexpr size_t  kAbiAddressSize         = 20;   
static constexpr size_t  kAbiAddressPadding      = kAbiWordSize - kAbiAddressSize; 
static constexpr size_t  kAbiBoolByteIndex       = kAbiWordSize - 1; 

static constexpr uint8_t  kRlpListPrefixMin       = 0xC0U; 

static constexpr size_t  kTypedTxPrefixSize       = 1;    

static constexpr uint64_t kDefaultChainId         = 1ULL;

static constexpr size_t  kKeccak256Size           = 32;

} // namespace eth

Updated on 2026-04-13 at 23:22:46 -0700