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Results tagged with solidity
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user 4181
Solidity is a contract-oriented, high-level language whose syntax is similar to that of JavaScript and it is designed for writing smart contracts in Ethereum to run on the EVM. Solidity is statically typed, supports inheritance, libraries and complex user-defined types among other features.
1
vote
Deploying a contract multiple times with the same Library
the answer to this can be found in solidity's docs:
Libraries are similar to contracts, but their purpose is that they are deployed only once at a specific address and their code is reused using …
- 3,408
1
vote
Is `require` in solidity identical to `assert`?
It's basically a short form. The idea likely originates from "requiring things to be there", which checks for a boolean condition, but also can check things the
assert way.
- 3,408
1
vote
Few questions about the overflow
but msg is composed by Ethereum network, and it should correspond to a real amount transfered, correct?
That is right. There is no tampering with msg. value. However, you could of course do 1 - m …
- 3,408
5
votes
3
votes
Accepted
Can I implement 'function balance()' in a contract?
address(this).balance
Here, balance is a member function of the address type. The function above is a function of your contract. Nothing to fear.
- 3,408
1
vote
Returning array of bytes32 in solidity
In case you need this data returned off-chain (not in a contract to contract call) you could simply iterate through the entries of a public array.
- 3,408
0
votes
TypeError: Type contract testAdoption is not implicitly convertible to expected type address
Implicit address conversion for this was deprecated in solidity 0.5.0ish.
You need to do address(this) now. …
- 3,408
1
vote
Event to alert when receive a token
For this, you need to
Write a function that emits a so called event.
Events take parameters (the data you want to log). give the event a parameter of the type uint256 and put msg.value as that para …
- 3,408
0
votes
How to take coins from a msg.sender? Or verify coins were sent?
it's almost impossible to make a contract generate randomnes] ) that generates a proposal for the number to be guessed, packed with some characters, > hashed, and then submitted < to the contract. in solidity …
- 3,408
0
votes
zeppelin-solidity Crowdsale. Access to token using javascript
return instance.publicMapping.call(mappingKey);
}).then(function(result) {
console.log(result.toString());
}).catch(function(e) {
console.log(e);
});
where mappingKey stands for the solidity …
- 3,408
0
votes
How to print transaction details like block number and other input parameters on front end?
It is highly recommended to use the Truffle Framework's JavaScript way of calling functions instead of jQuery, although Truffle's PetSShop tutorial shows otherwise.
If you do truffle unbox webpack an …
- 3,408
0
votes
How to include the named of the called contract in Event Log
This is not possible:
There is no way (yet) for a contract to read another contract's name. If you know the contracts you are calling, you can reference their name by some identifier, either a strin …
- 3,408
1
vote
Remix error : The constructor should be payable if you send value
In addition to the previous answer, which would lead you to a different issue, the original issue is that you have not marked the constructor function as payable although you send along some value dur …
- 3,408
4
votes
Wrong parameter passed in the constructor. How can I fix it?
How can we fix this?
If you havn't included a function to do so, not at all.
Can I contact Etherscan for help
I don't mean to be rude here, but if you are not clear about how etherscan and …
- 3,408
0
votes
Solidity | Smart Contract (Ethereum) transaction tracker API
If your contract grants the right to someone to call a function, there is no way for you to stop him from doing this (when the transaction is already sent). Of course you can implement safety measures …
- 3,408