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Add _ to remaining internal/private functions

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This commit is contained in:
Amir Bandeali
2019-05-07 16:00:14 -07:00
parent 3217c1e11f
commit 6763bce627
19 changed files with 68 additions and 69 deletions
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4
contracts/coordinator/contracts/src/libs/LibCoordinatorApproval.sol
View File

@@ -51,14 +51,14 @@ contract LibCoordinatorApproval is
view
returns (bytes32 approvalHash)
{
approvalHash = hashEIP712CoordinatorMessage(hashCoordinatorApproval(approval));
approvalHash = _hashEIP712CoordinatorMessage(_hashCoordinatorApproval(approval));
return approvalHash;
}
/// @dev Calculated the EIP712 hash of the Coordinator approval mesasage with no domain separator.
/// @param approval Coordinator approval message containing the transaction hash, transaction signature, and expiration of the approval.
/// @return EIP712 hash of the Coordinator approval message with no domain separator.
function hashCoordinatorApproval(CoordinatorApproval memory approval)
function _hashCoordinatorApproval(CoordinatorApproval memory approval)
internal
pure
returns (bytes32 result)

2
contracts/coordinator/contracts/src/libs/LibEIP712CoordinatorDomain.sol
View File

@@ -56,7 +56,7 @@ contract LibEIP712CoordinatorDomain is
/// of this contract.
/// @param hashStruct The EIP712 hash struct.
/// @return EIP712 hash applied to this EIP712 Domain.
function hashEIP712CoordinatorMessage(bytes32 hashStruct)
function _hashEIP712CoordinatorMessage(bytes32 hashStruct)
internal
view
returns (bytes32 result)

4
contracts/erc1155/contracts/src/ERC1155.sol
View File

@@ -97,7 +97,7 @@ contract ERC1155 is
emit TransferSingle(msg.sender, from, to, id, value);
// if `to` is a contract then trigger its callback
if (to.isContract()) {
if (to._isContract()) {
bytes4 callbackReturnValue = IERC1155Receiver(to).onERC1155Received(
msg.sender,
from,
@@ -177,7 +177,7 @@ contract ERC1155 is
emit TransferBatch(msg.sender, from, to, ids, values);
// if `to` is a contract then trigger its callback
if (to.isContract()) {
if (to._isContract()) {
bytes4 callbackReturnValue = IERC1155Receiver(to).onERC1155BatchReceived(
msg.sender,
from,

4
contracts/erc1155/contracts/src/ERC1155Mintable.sol
View File

@@ -128,7 +128,7 @@ contract ERC1155Mintable is
);
// if `to` is a contract then trigger its callback
if (dst.isContract()) {
if (dst._isContract()) {
bytes4 callbackReturnValue = IERC1155Receiver(dst).onERC1155Received(
msg.sender,
msg.sender,
@@ -177,7 +177,7 @@ contract ERC1155Mintable is
emit TransferSingle(msg.sender, address(0x0), dst, id, 1);
// if `to` is a contract then trigger its callback
if (dst.isContract()) {
if (dst._isContract()) {
bytes4 callbackReturnValue = IERC1155Receiver(dst).onERC1155Received(
msg.sender,
msg.sender,

1
contracts/exchange-libs/tsconfig.json
View File

@@ -4,7 +4,6 @@
"include": ["./src/**/*", "./test/**/*", "./generated-wrappers/**/*"],
"files": [
"generated-artifacts/LibAbiEncoder.json",
"generated-artifacts/LibAssetProxyErrors.json",
"generated-artifacts/LibConstants.json",
"generated-artifacts/LibEIP712ExchangeDomain.json",
"generated-artifacts/LibFillResults.json",

4
contracts/exchange/contracts/src/MixinExchangeCore.sol
View File

@@ -231,7 +231,7 @@ contract MixinExchangeCore is
);
// Settle order
settleOrder(
_settleOrder(
orderHash,
order,
takerAddress,
@@ -499,7 +499,7 @@ contract MixinExchangeCore is
/// @param order Order struct containing order specifications.
/// @param takerAddress Address selling takerAsset and buying makerAsset.
/// @param fillResults Amounts to be filled and fees paid by maker and taker.
function settleOrder(
function _settleOrder(
bytes32 orderHash,
LibOrder.Order memory order,
address takerAddress,

4
contracts/exchange/contracts/src/MixinMatchOrders.sol
View File

@@ -124,7 +124,7 @@ contract MixinMatchOrders is
);
// Settle matched orders. Succeeds or throws.
settleMatchedOrders(
_settleMatchedOrders(
leftOrderInfo.orderHash,
rightOrderInfo.orderHash,
leftOrder,
@@ -272,7 +272,7 @@ contract MixinMatchOrders is
/// @param rightOrder Second matched order.
/// @param takerAddress Address that matched the orders. The taker receives the spread between orders as profit.
/// @param matchedFillResults Struct holding amounts to transfer between makers, taker, and fee recipients.
function settleMatchedOrders(
function _settleMatchedOrders(
bytes32 leftOrderHash,
bytes32 rightOrderHash,
LibOrder.Order memory leftOrder,

28
contracts/exchange/contracts/src/MixinSignatureValidator.sol
View File

@@ -136,7 +136,7 @@ contract MixinSignatureValidator is
view
returns (bool isValid)
{
SignatureType signatureType = readValidSignatureType(
SignatureType signatureType = _readValidSignatureType(
hash,
signerAddress,
signature
@@ -152,7 +152,7 @@ contract MixinSignatureValidator is
signature
));
}
return validateHashSignatureTypes(
return _validateHashSignatureTypes(
signatureType,
hash,
signerAddress,
@@ -177,14 +177,14 @@ contract MixinSignatureValidator is
view
returns (bool isValid)
{
SignatureType signatureType = readValidSignatureType(
SignatureType signatureType = _readValidSignatureType(
orderHash,
signerAddress,
signature
);
if (signatureType == SignatureType.OrderValidator) {
// The entire order is verified by validator contract.
isValid = validateOrderWithValidator(
isValid = _validateOrderWithValidator(
order,
orderHash,
signerAddress,
@@ -193,7 +193,7 @@ contract MixinSignatureValidator is
return isValid;
} else if (signatureType == SignatureType.WalletOrderValidator) {
// The entire order is verified by a wallet contract.
isValid = validateOrderWithWallet(
isValid = _validateOrderWithWallet(
order,
orderHash,
signerAddress,
@@ -202,7 +202,7 @@ contract MixinSignatureValidator is
return isValid;
}
// Otherwise, it's one of the hash-compatible signature types.
return validateHashSignatureTypes(
return _validateHashSignatureTypes(
signatureType,
orderHash,
signerAddress,
@@ -211,7 +211,7 @@ contract MixinSignatureValidator is
}
/// Reads the `SignatureType` from the end of a signature and validates it.
function readValidSignatureType(
function _readValidSignatureType(
bytes32 hash,
address signerAddress,
bytes memory signature
@@ -265,7 +265,7 @@ contract MixinSignatureValidator is
/// and defines its own signature verification method.
/// @param signature Proof that the hash has been signed by signer.
/// @return True if the signature is validated by the Walidator.
function validateHashWithWallet(
function _validateHashWithWallet(
bytes32 hash,
address walletAddress,
bytes memory signature
@@ -310,7 +310,7 @@ contract MixinSignatureValidator is
/// @param signerAddress Address that should have signed the given hash.
/// @param signature Proof that the hash has been signed by signer.
/// @return True if the signature is validated by the Validator.
function validateHashWithValidator(
function _validateHashWithValidator(
bytes32 hash,
address signerAddress,
bytes memory signature
@@ -370,7 +370,7 @@ contract MixinSignatureValidator is
/// and defines its own order/signature verification method.
/// @param signature Proof that the order has been signed by signer.
/// @return True if order and signature are validated by the Wallet.
function validateOrderWithWallet(
function _validateOrderWithWallet(
Order memory order,
bytes32 orderHash,
address walletAddress,
@@ -418,7 +418,7 @@ contract MixinSignatureValidator is
/// @param signerAddress Address that should have signed the given hash.
/// @param signature Proof that the hash has been signed by signer.
/// @return True if order and signature are validated by the Validator.
function validateOrderWithValidator(
function _validateOrderWithValidator(
Order memory order,
bytes32 orderHash,
address signerAddress,
@@ -473,7 +473,7 @@ contract MixinSignatureValidator is
/// Validates a hash-compatible signature type
/// (anything but `OrderValidator` and `WalletOrderValidator`).
function validateHashSignatureTypes(
function _validateHashSignatureTypes(
SignatureType signatureType,
bytes32 hash,
address signerAddress,
@@ -549,7 +549,7 @@ contract MixinSignatureValidator is
// Signature verified by wallet contract.
// If used with an order, the maker of the order is the wallet contract.
} else if (signatureType == SignatureType.Wallet) {
isValid = validateHashWithWallet(
isValid = _validateHashWithWallet(
hash,
signerAddress,
signature
@@ -559,7 +559,7 @@ contract MixinSignatureValidator is
// Signature verified by validator contract.
// If used with an order, the maker of the order can still be an EOA.
} else if (signatureType == SignatureType.Validator) {
isValid = validateHashWithValidator(
isValid = _validateHashWithValidator(
hash,
signerAddress,
signature

10
contracts/exchange/contracts/test/ReentrantERC20Token.sol
View File

@@ -111,7 +111,7 @@ contract ReentrantERC20Token is
callData = abi.encodeWithSelector(
exchange.batchFillOrders.selector,
orders,
getTakerFillAmounts(orders),
_getTakerFillAmounts(orders),
_createWalletSignatures(BATCH_SIZE)
);
} else if (currentFunctionId == uint8(ExchangeFunction.BATCH_FILL_OR_KILL_ORDERS)) {
@@ -119,7 +119,7 @@ contract ReentrantERC20Token is
callData = abi.encodeWithSelector(
exchange.batchFillOrKillOrders.selector,
orders,
getTakerFillAmounts(orders),
_getTakerFillAmounts(orders),
_createWalletSignatures(BATCH_SIZE)
);
} else if (currentFunctionId == uint8(ExchangeFunction.MARKET_BUY_ORDERS)) {
@@ -139,7 +139,7 @@ contract ReentrantERC20Token is
_createWalletSignatures(BATCH_SIZE)
);
} else if (currentFunctionId == uint8(ExchangeFunction.MATCH_ORDERS)) {
LibOrder.Order[2] memory orders = createMatchedOrders();
LibOrder.Order[2] memory orders = _createMatchedOrders();
bytes[] memory signatures = _createWalletSignatures(2);
callData = abi.encodeWithSelector(
exchange.matchOrders.selector,
@@ -232,7 +232,7 @@ contract ReentrantERC20Token is
}
/// @dev Create two complementary test orders.
function createMatchedOrders()
function _createMatchedOrders()
internal
view
returns (LibOrder.Order[2] memory orders)
@@ -245,7 +245,7 @@ contract ReentrantERC20Token is
orders[1].makerAssetAmount = orders[0].takerAssetAmount;
}
function getTakerFillAmounts(
function _getTakerFillAmounts(
LibOrder.Order[] memory orders
)
internal

14
contracts/extensions/contracts/src/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol
View File

@@ -63,7 +63,7 @@ contract MixinBalanceThresholdFilterCore is
external
{
// Get accounts whose balances must be validated
address[] memory addressesToValidate = getAddressesToValidate(signerAddress);
address[] memory addressesToValidate = _getAddressesToValidate(signerAddress);
// Validate account balances
uint256 balanceThreshold = BALANCE_THRESHOLD;
@@ -92,12 +92,12 @@ contract MixinBalanceThresholdFilterCore is
/// (defined by `signedExchangeTransaction` above).
/// @param signerAddress Address of transaction signer.
/// @return addressesToValidate Array of addresses to validate.
function getAddressesToValidate(address signerAddress)
function _getAddressesToValidate(address signerAddress)
internal
pure
returns (address[] memory addressesToValidate)
{
bytes4 exchangeFunctionSelector = bytes4(exchangeCalldataload(0));
bytes4 exchangeFunctionSelector = bytes4(_exchangeCalldataload(0));
// solhint-disable expression-indent
if (
exchangeFunctionSelector == BATCH_FILL_ORDERS_SELECTOR ||
@@ -108,20 +108,20 @@ contract MixinBalanceThresholdFilterCore is
exchangeFunctionSelector == MARKET_SELL_ORDERS_SELECTOR ||
exchangeFunctionSelector == MARKET_SELL_ORDERS_NO_THROW_SELECTOR
) {
addressesToValidate = loadMakerAddressesFromOrderArray(0);
addressesToValidate = _loadMakerAddressesFromOrderArray(0);
addressesToValidate = addressesToValidate.append(signerAddress);
} else if (
exchangeFunctionSelector == FILL_ORDER_SELECTOR ||
exchangeFunctionSelector == FILL_ORDER_NO_THROW_SELECTOR ||
exchangeFunctionSelector == FILL_OR_KILL_ORDER_SELECTOR
) {
address makerAddress = loadMakerAddressFromOrder(0);
address makerAddress = _loadMakerAddressFromOrder(0);
addressesToValidate = addressesToValidate.append(makerAddress);
addressesToValidate = addressesToValidate.append(signerAddress);
} else if (exchangeFunctionSelector == MATCH_ORDERS_SELECTOR) {
address leftMakerAddress = loadMakerAddressFromOrder(0);
address leftMakerAddress = _loadMakerAddressFromOrder(0);
addressesToValidate = addressesToValidate.append(leftMakerAddress);
address rightMakerAddress = loadMakerAddressFromOrder(1);
address rightMakerAddress = _loadMakerAddressFromOrder(1);
addressesToValidate = addressesToValidate.append(rightMakerAddress);
addressesToValidate = addressesToValidate.append(signerAddress);
} else if (

22
contracts/extensions/contracts/src/BalanceThresholdFilter/MixinExchangeCalldata.sol
View File

@@ -33,7 +33,7 @@ contract MixinExchangeCalldata is
/// which is accessed through `signedExchangeTransaction`.
/// @param offset Offset into the Exchange calldata.
/// @return value Corresponding 32 byte value stored at `offset`.
function exchangeCalldataload(uint256 offset)
function _exchangeCalldataload(uint256 offset)
internal
pure
returns (bytes32 value)
@@ -58,12 +58,12 @@ contract MixinExchangeCalldata is
/// from the embedded Exchange calldata.
/// @param offset Offset into the Exchange calldata (minus the 4 byte selector)
/// @return value Corresponding 32 byte value stored at `offset` + 4.
function loadExchangeData(uint256 offset)
function _loadExchangeData(uint256 offset)
internal
pure
returns (bytes32 value)
{
value = exchangeCalldataload(offset + 4);
value = _exchangeCalldataload(offset + 4);
return value;
}
@@ -71,14 +71,14 @@ contract MixinExchangeCalldata is
/// (which is embedded in `signedExchangeTransaction`).
/// @param orderParamIndex Index of the order in the Exchange function's signature.
/// @return makerAddress The extracted maker address.
function loadMakerAddressFromOrder(uint256 orderParamIndex)
function _loadMakerAddressFromOrder(uint256 orderParamIndex)
internal
pure
returns (address makerAddress)
{
uint256 orderOffsetInBytes = orderParamIndex * 32;
uint256 orderPtr = uint256(loadExchangeData(orderOffsetInBytes));
makerAddress = address(uint256(loadExchangeData(orderPtr)));
uint256 orderPtr = uint256(_loadExchangeData(orderOffsetInBytes));
makerAddress = address(uint256(_loadExchangeData(orderPtr)));
return makerAddress;
}
@@ -86,20 +86,20 @@ contract MixinExchangeCalldata is
/// (which is embedded in `signedExchangeTransaction`).
/// @param orderArrayParamIndex Index of the order array in the Exchange function's signature
/// @return makerAddresses The extracted maker addresses.
function loadMakerAddressesFromOrderArray(uint256 orderArrayParamIndex)
function _loadMakerAddressesFromOrderArray(uint256 orderArrayParamIndex)
internal
pure
returns (address[] memory makerAddresses)
{
uint256 orderArrayOffsetInBytes = orderArrayParamIndex * 32;
uint256 orderArrayPtr = uint256(loadExchangeData(orderArrayOffsetInBytes));
uint256 orderArrayLength = uint256(loadExchangeData(orderArrayPtr));
uint256 orderArrayPtr = uint256(_loadExchangeData(orderArrayOffsetInBytes));
uint256 orderArrayLength = uint256(_loadExchangeData(orderArrayPtr));
uint256 orderArrayLengthInBytes = orderArrayLength * 32;
uint256 orderArrayElementPtr = orderArrayPtr + 32;
uint256 orderArrayElementEndPtr = orderArrayElementPtr + orderArrayLengthInBytes;
for (uint orderPtrOffset = orderArrayElementPtr; orderPtrOffset < orderArrayElementEndPtr; orderPtrOffset += 32) {
uint256 orderPtr = uint256(loadExchangeData(orderPtrOffset));
address makerAddress = address(uint256(loadExchangeData(orderPtr + orderArrayElementPtr)));
uint256 orderPtr = uint256(_loadExchangeData(orderPtrOffset));
address makerAddress = address(uint256(_loadExchangeData(orderPtr + orderArrayElementPtr)));
makerAddresses = makerAddresses.append(makerAddress);
}
return makerAddresses;

2
contracts/extensions/contracts/src/BalanceThresholdFilter/mixins/MBalanceThresholdFilterCore.sol
View File

@@ -48,7 +48,7 @@ contract MBalanceThresholdFilterCore is
/// (defined by `signedExchangeTransaction` above).
/// @param signerAddress Address of transaction signer.
/// @return addressesToValidate Array of addresses to validate.
function getAddressesToValidate(address signerAddress)
function _getAddressesToValidate(address signerAddress)
internal
pure
returns (address[] memory addressesToValidate);

8
contracts/extensions/contracts/src/BalanceThresholdFilter/mixins/MExchangeCalldata.sol
View File

@@ -26,7 +26,7 @@ contract MExchangeCalldata {
/// which is accessed through `signedExchangeTransaction`.
/// @param offset Offset into the Exchange calldata.
/// @return value Corresponding 32 byte value stored at `offset`.
function exchangeCalldataload(uint256 offset)
function _exchangeCalldataload(uint256 offset)
internal pure
returns (bytes32 value);
@@ -34,7 +34,7 @@ contract MExchangeCalldata {
/// from the embedded Exchange calldata.
/// @param offset Offset into the Exchange calldata (minus the 4 byte selector)
/// @return value Corresponding 32 byte value stored at `offset` + 4.
function loadExchangeData(uint256 offset)
function _loadExchangeData(uint256 offset)
internal pure
returns (bytes32 value);
@@ -42,7 +42,7 @@ contract MExchangeCalldata {
/// (which is embedded in `signedExchangeTransaction`).
/// @param orderParamIndex Index of the order in the Exchange function's signature.
/// @return makerAddress The extracted maker address.
function loadMakerAddressFromOrder(uint256 orderParamIndex)
function _loadMakerAddressFromOrder(uint256 orderParamIndex)
internal pure
returns (address makerAddress);
@@ -50,7 +50,7 @@ contract MExchangeCalldata {
/// (which is embedded in `signedExchangeTransaction`).
/// @param orderArrayParamIndex Index of the order array in the Exchange function's signature
/// @return makerAddresses The extracted maker addresses.
function loadMakerAddressesFromOrderArray(uint256 orderArrayParamIndex)
function _loadMakerAddressesFromOrderArray(uint256 orderArrayParamIndex)
internal
pure
returns (address[] memory makerAddresses);

8
contracts/extensions/contracts/src/OrderMatcher/MixinAssets.sol
View File

@@ -61,9 +61,9 @@ contract MixinAssets is
bytes4 proxyId = assetData.readBytes4(0);
if (proxyId == ERC20_DATA_ID) {
approveERC20Token(assetData, amount);
_approveERC20Token(assetData, amount);
} else if (proxyId == ERC721_DATA_ID) {
approveERC721Token(assetData, amount);
_approveERC721Token(assetData, amount);
} else {
revert("UNSUPPORTED_ASSET_PROXY");
}
@@ -166,7 +166,7 @@ contract MixinAssets is
/// @dev Sets approval for ERC20 AssetProxy.
/// @param assetData Byte array encoded for the respective asset proxy.
/// @param amount Amount of asset to approve for respective proxy.
function approveERC20Token(
function _approveERC20Token(
bytes memory assetData,
uint256 amount
)
@@ -182,7 +182,7 @@ contract MixinAssets is
/// @dev Sets approval for ERC721 AssetProxy.
/// @param assetData Byte array encoded for the respective asset proxy.
/// @param amount Amount of asset to approve for respective proxy.
function approveERC721Token(
function _approveERC721Token(
bytes memory assetData,
uint256 amount
)

4
contracts/extensions/contracts/src/OrderMatcher/mixins/MAssets.sol
View File

@@ -54,7 +54,7 @@ contract MAssets is
/// @dev Sets approval for ERC20 AssetProxy.
/// @param assetData Byte array encoded for the respective asset proxy.
/// @param amount Amount of asset to approve for respective proxy.
function approveERC20Token(
function _approveERC20Token(
bytes memory assetData,
uint256 amount
)
@@ -63,7 +63,7 @@ contract MAssets is
/// @dev Sets approval for ERC721 AssetProxy.
/// @param assetData Byte array encoded for the respective asset proxy.
/// @param amount Amount of asset to approve for respective proxy.
function approveERC721Token(
function _approveERC721Token(
bytes memory assetData,
uint256 amount
)

2
contracts/multisig/contracts/src/AssetProxyOwner.sol
View File

@@ -98,7 +98,7 @@ contract AssetProxyOwner is
{
Transaction storage txn = transactions[transactionId];
txn.executed = true;
if (external_call(txn.destination, txn.value, txn.data.length, txn.data)) {
if (_external_call(txn.destination, txn.value, txn.data.length, txn.data)) {
emit Execution(transactionId);
} else {
emit ExecutionFailure(transactionId);

8
contracts/multisig/contracts/src/MultiSigWallet.sol
View File

@@ -191,7 +191,7 @@ contract MultiSigWallet {
public
returns (uint transactionId)
{
transactionId = addTransaction(destination, value, data);
transactionId = _addTransaction(destination, value, data);
confirmTransaction(transactionId);
}
@@ -231,7 +231,7 @@ contract MultiSigWallet {
if (isConfirmed(transactionId)) {
Transaction storage txn = transactions[transactionId];
txn.executed = true;
if (external_call(txn.destination, txn.value, txn.data.length, txn.data))
if (_external_call(txn.destination, txn.value, txn.data.length, txn.data))
Execution(transactionId);
else {
ExecutionFailure(transactionId);
@@ -242,7 +242,7 @@ contract MultiSigWallet {
// call has been separated into its own function in order to take advantage
// of the Solidity's code generator to produce a loop that copies tx.data into memory.
function external_call(address destination, uint value, uint dataLength, bytes data) internal returns (bool) {
function _external_call(address destination, uint value, uint dataLength, bytes data) internal returns (bool) {
bool result;
assembly {
let x := mload(0x40) // "Allocate" memory for output (0x40 is where "free memory" pointer is stored by convention)
@@ -287,7 +287,7 @@ contract MultiSigWallet {
/// @param value Transaction ether value.
/// @param data Transaction data payload.
/// @return Returns transaction ID.
function addTransaction(address destination, uint value, bytes data)
function _addTransaction(address destination, uint value, bytes data)
internal
notNull(destination)
returns (uint transactionId)

6
contracts/multisig/contracts/src/MultiSigWalletWithTimeLock.sol
View File

@@ -95,7 +95,7 @@ contract MultiSigWalletWithTimeLock is
confirmations[transactionId][msg.sender] = true;
emit Confirmation(msg.sender, transactionId);
if (isConfirmed(transactionId)) {
setConfirmationTime(transactionId, block.timestamp);
_setConfirmationTime(transactionId, block.timestamp);
}
}
@@ -109,7 +109,7 @@ contract MultiSigWalletWithTimeLock is
{
Transaction storage txn = transactions[transactionId];
txn.executed = true;
if (external_call(txn.destination, txn.value, txn.data.length, txn.data)) {
if (_external_call(txn.destination, txn.value, txn.data.length, txn.data)) {
emit Execution(transactionId);
} else {
emit ExecutionFailure(transactionId);
@@ -118,7 +118,7 @@ contract MultiSigWalletWithTimeLock is
}
/// @dev Sets the time of when a submission first passed.
function setConfirmationTime(uint256 transactionId, uint256 confirmationTime)
function _setConfirmationTime(uint256 transactionId, uint256 confirmationTime)
internal
{
confirmationTimes[transactionId] = confirmationTime;

2
contracts/utils/contracts/src/Address.sol
View File

@@ -31,7 +31,7 @@ library Address {
* @param account address of the account to check
* @return whether the target address is a contract
*/
function isContract(address account) internal view returns (bool) {
function _isContract(address account) internal view returns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address
// than to check the size of the code at that address.