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
edited 39 mins ago
Aniket
2,1721733
asked 1 hour ago
RudrikaRudrika
749
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
edited 39 mins ago
Aniket
2,1721733
asked 1 hour ago
RudrikaRudrika
749
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
edited 39 mins ago
Aniket
2,1721733
asked 1 hour ago
RudrikaRudrika
749
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 39 mins ago
Aniket
2,1721733
asked 1 hour ago
RudrikaRudrika
749
edited 39 mins ago
Aniket
2,1721733
asked 1 hour ago
RudrikaRudrika
749
edited 39 mins ago
Aniket
2,1721733
edited 39 mins ago
Aniket
2,1721733
edited 39 mins ago
Aniket
2,1721733
2,1721733
asked 1 hour ago
RudrikaRudrika
749
asked 1 hour ago
RudrikaRudrika
749
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
answered 42 mins ago
AniketAniket
2,1721733
Thank you for the Answer...!
– Rudrika
13 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
10 mins ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
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
answered 42 mins ago
AniketAniket
2,1721733
Thank you for the Answer...!
– Rudrika
13 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
10 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
answered 42 mins ago
AniketAniket
2,1721733
Thank you for the Answer...!
– Rudrika
13 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
10 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
answered 42 mins ago
AniketAniket
2,1721733
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 42 mins ago
AniketAniket
2,1721733
answered 42 mins ago
AniketAniket
2,1721733
answered 42 mins ago
AniketAniket
2,1721733
answered 42 mins ago
AniketAniket
2,1721733
2,1721733
Thank you for the Answer...!
– Rudrika
13 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
10 mins ago
add a comment |
Thank you for the Answer...!
– Rudrika
13 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
10 mins ago
Thank you for the Answer...!
– Rudrika
13 mins ago
Thank you for the Answer...!
– Rudrika
13 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
10 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
10 mins ago
add a comment |
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