What does the assert() indicate here?
Here is code snippet,
function transfer(address _to, uint _value, bytes memory _data, string memory _custom_fallback) public returns (bool success) {
if(isContract(_to)) {
if (balanceOf(msg.sender) < _value) revert();
balances[msg.sender] = safeSub(balanceOf(msg.sender), _value);
balances[_to] = safeAdd(balanceOf(_to), _value);
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
emit Transfer(msg.sender, _to, _value, _data);
return true;
}
else {
return transferToAddress(_to, _value, _data);
}
}
I am currently working with Solidity Version ^0.5.1
. What is the alternative and upgraded method to execute this assert function given below. And what is the main working of this assert()
and their arguments?
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
solidity remix erc-223
add a comment |
Here is code snippet,
function transfer(address _to, uint _value, bytes memory _data, string memory _custom_fallback) public returns (bool success) {
if(isContract(_to)) {
if (balanceOf(msg.sender) < _value) revert();
balances[msg.sender] = safeSub(balanceOf(msg.sender), _value);
balances[_to] = safeAdd(balanceOf(_to), _value);
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
emit Transfer(msg.sender, _to, _value, _data);
return true;
}
else {
return transferToAddress(_to, _value, _data);
}
}
I am currently working with Solidity Version ^0.5.1
. What is the alternative and upgraded method to execute this assert function given below. And what is the main working of this assert()
and their arguments?
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
solidity remix erc-223
add a comment |
Here is code snippet,
function transfer(address _to, uint _value, bytes memory _data, string memory _custom_fallback) public returns (bool success) {
if(isContract(_to)) {
if (balanceOf(msg.sender) < _value) revert();
balances[msg.sender] = safeSub(balanceOf(msg.sender), _value);
balances[_to] = safeAdd(balanceOf(_to), _value);
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
emit Transfer(msg.sender, _to, _value, _data);
return true;
}
else {
return transferToAddress(_to, _value, _data);
}
}
I am currently working with Solidity Version ^0.5.1
. What is the alternative and upgraded method to execute this assert function given below. And what is the main working of this assert()
and their arguments?
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
solidity remix erc-223
Here is code snippet,
function transfer(address _to, uint _value, bytes memory _data, string memory _custom_fallback) public returns (bool success) {
if(isContract(_to)) {
if (balanceOf(msg.sender) < _value) revert();
balances[msg.sender] = safeSub(balanceOf(msg.sender), _value);
balances[_to] = safeAdd(balanceOf(_to), _value);
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
emit Transfer(msg.sender, _to, _value, _data);
return true;
}
else {
return transferToAddress(_to, _value, _data);
}
}
I am currently working with Solidity Version ^0.5.1
. What is the alternative and upgraded method to execute this assert function given below. And what is the main working of this assert()
and their arguments?
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data));
solidity remix erc-223
solidity remix erc-223
edited 32 mins ago
Aniket
2,1721733
2,1721733
asked 1 hour ago
RudrikaRudrika
749
749
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)),
msg.sender, _value, _data));
- what is the main working of this assert() and their arguments?
This assert
is calling a function of _to
(when it is a contract) passed as a parameter in transfer
and checking the return value as true. bytes4(keccak256(_custom_fallback))
is used to select the function to execute and msg.sender, _value, _data
are the parameter values to pass in calling function. value(0)
signifies the sending of 0 wei with the call.
See related: Whats the difference between .call.value() and .call.value()()
- What is the alternative and upgraded method to execute this assert
function given below
You can use abi.encodeWithSignature(string memory signature, ...) returns (bytes memory)
as:
_to.call.value(0)(abi.encodeWithSignature(_custom_fallback, msg.sender, _value, _data));
See related: https://solidity.readthedocs.io/en/v0.5.3/units-and-global-variables.html#abi-encoding-and-decoding-functions
Thank you for the Answer...!
– Rudrika
7 mins ago
But Right now I am working with ERC223 token transfer, in that case does Signature Encoding is really applicable? Previously I have used keccak256(abi.encodePacked()) for this encoding. But there is wrong syntax or structure I have, so It didn't worked with _to.call.value(0).
– Rudrika
3 mins ago
add a comment |
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1 Answer
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1 Answer
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active
oldest
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votes
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)),
msg.sender, _value, _data));
- what is the main working of this assert() and their arguments?
This assert
is calling a function of _to
(when it is a contract) passed as a parameter in transfer
and checking the return value as true. bytes4(keccak256(_custom_fallback))
is used to select the function to execute and msg.sender, _value, _data
are the parameter values to pass in calling function. value(0)
signifies the sending of 0 wei with the call.
See related: Whats the difference between .call.value() and .call.value()()
- What is the alternative and upgraded method to execute this assert
function given below
You can use abi.encodeWithSignature(string memory signature, ...) returns (bytes memory)
as:
_to.call.value(0)(abi.encodeWithSignature(_custom_fallback, msg.sender, _value, _data));
See related: https://solidity.readthedocs.io/en/v0.5.3/units-and-global-variables.html#abi-encoding-and-decoding-functions
Thank you for the Answer...!
– Rudrika
7 mins ago
But Right now I am working with ERC223 token transfer, in that case does Signature Encoding is really applicable? Previously I have used keccak256(abi.encodePacked()) for this encoding. But there is wrong syntax or structure I have, so It didn't worked with _to.call.value(0).
– Rudrika
3 mins ago
add a comment |
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)),
msg.sender, _value, _data));
- what is the main working of this assert() and their arguments?
This assert
is calling a function of _to
(when it is a contract) passed as a parameter in transfer
and checking the return value as true. bytes4(keccak256(_custom_fallback))
is used to select the function to execute and msg.sender, _value, _data
are the parameter values to pass in calling function. value(0)
signifies the sending of 0 wei with the call.
See related: Whats the difference between .call.value() and .call.value()()
- What is the alternative and upgraded method to execute this assert
function given below
You can use abi.encodeWithSignature(string memory signature, ...) returns (bytes memory)
as:
_to.call.value(0)(abi.encodeWithSignature(_custom_fallback, msg.sender, _value, _data));
See related: https://solidity.readthedocs.io/en/v0.5.3/units-and-global-variables.html#abi-encoding-and-decoding-functions
Thank you for the Answer...!
– Rudrika
7 mins ago
But Right now I am working with ERC223 token transfer, in that case does Signature Encoding is really applicable? Previously I have used keccak256(abi.encodePacked()) for this encoding. But there is wrong syntax or structure I have, so It didn't worked with _to.call.value(0).
– Rudrika
3 mins ago
add a comment |
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)),
msg.sender, _value, _data));
- what is the main working of this assert() and their arguments?
This assert
is calling a function of _to
(when it is a contract) passed as a parameter in transfer
and checking the return value as true. bytes4(keccak256(_custom_fallback))
is used to select the function to execute and msg.sender, _value, _data
are the parameter values to pass in calling function. value(0)
signifies the sending of 0 wei with the call.
See related: Whats the difference between .call.value() and .call.value()()
- What is the alternative and upgraded method to execute this assert
function given below
You can use abi.encodeWithSignature(string memory signature, ...) returns (bytes memory)
as:
_to.call.value(0)(abi.encodeWithSignature(_custom_fallback, msg.sender, _value, _data));
See related: https://solidity.readthedocs.io/en/v0.5.3/units-and-global-variables.html#abi-encoding-and-decoding-functions
assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)),
msg.sender, _value, _data));
- what is the main working of this assert() and their arguments?
This assert
is calling a function of _to
(when it is a contract) passed as a parameter in transfer
and checking the return value as true. bytes4(keccak256(_custom_fallback))
is used to select the function to execute and msg.sender, _value, _data
are the parameter values to pass in calling function. value(0)
signifies the sending of 0 wei with the call.
See related: Whats the difference between .call.value() and .call.value()()
- What is the alternative and upgraded method to execute this assert
function given below
You can use abi.encodeWithSignature(string memory signature, ...) returns (bytes memory)
as:
_to.call.value(0)(abi.encodeWithSignature(_custom_fallback, msg.sender, _value, _data));
See related: https://solidity.readthedocs.io/en/v0.5.3/units-and-global-variables.html#abi-encoding-and-decoding-functions
answered 35 mins ago
AniketAniket
2,1721733
2,1721733
Thank you for the Answer...!
– Rudrika
7 mins ago
But Right now I am working with ERC223 token transfer, in that case does Signature Encoding is really applicable? Previously I have used keccak256(abi.encodePacked()) for this encoding. But there is wrong syntax or structure I have, so It didn't worked with _to.call.value(0).
– Rudrika
3 mins ago
add a comment |
Thank you for the Answer...!
– Rudrika
7 mins ago
But Right now I am working with ERC223 token transfer, in that case does Signature Encoding is really applicable? Previously I have used keccak256(abi.encodePacked()) for this encoding. But there is wrong syntax or structure I have, so It didn't worked with _to.call.value(0).
– Rudrika
3 mins ago
Thank you for the Answer...!
– Rudrika
7 mins ago
Thank you for the Answer...!
– Rudrika
7 mins ago
But Right now I am working with ERC223 token transfer, in that case does Signature Encoding is really applicable? Previously I have used keccak256(abi.encodePacked()) for this encoding. But there is wrong syntax or structure I have, so It didn't worked with _to.call.value(0).
– Rudrika
3 mins ago
But Right now I am working with ERC223 token transfer, in that case does Signature Encoding is really applicable? Previously I have used keccak256(abi.encodePacked()) for this encoding. But there is wrong syntax or structure I have, so It didn't worked with _to.call.value(0).
– Rudrika
3 mins ago
add a comment |
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