Questions tagged [contract]
424 questions
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Error in defining contract on struct in Racket
I'm trying to define a contract for a struct which inherits from another struct.
#lang racket
(require racket/contract racket/contract/parametric)
(struct semigroup (op))
(struct monoid (mempty) #:super struct:semigroup)
(define (semigroup/c a)…
Charles Langlois
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1
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1 answer
contract for function that only cares about return value?
Suppose the following trivial function:
(define/contract (foo func)
(-> (-> any/c ... any/c) #t)
#t)
This is trying (and failing) to express the idea "foo takes a processor function. I don't care what arguments the processor requires (that's…
Ben Greenman
- 1,945
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1
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1 answer
Sending tokens from Ethereum ERC 20 smart contract
As the title suggests - is it possible to send tokens from an ERC20 smart contract address, or is this unit not accessible?
Practical explanation:
A noob misunderstands some instructions and sends some tokens instead to his address to a smart…
belosand
- 129
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1
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1 answer
Calling functions from other contracts solidity
I am trying to create a new instance of the Taker contract from the Maker contract and send some value to it.
Then later I would like to send a value back to the Maker contract from the Taker contract
maker.change.value(5)(y);
However it cannot…
MathsAndBlocks
- 11
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1 answer
WCF: How to enforce MessageContractAttribute.IsWrapped=false generation?
In other words: How to change wcf service contract to remove additional "message's" wrapper from soap message (adopt wsdl)?
I have created WCF service which contract is:
[ServiceContract(Namespace = "http://blabla/", Name =…
Roman Pokrovskij
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1
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1 answer
Why is the balance of the ethereum account still zero after I create a token based on the private chain I built？
I used the contract codes available on the ethereum official website，[create your own cryto-currency][1] to create an advanced token on the private chain run in geth console. The version of geth is 1.5.5，and the version of solc is 0.4.8.
My steps…
陈明艳
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1 answer
Scheme contract not violated
First, I apologize for the beginner question. I am an experienced developer, but new to Scheme. I have created a contract requiring a positive integer, but when I provide a real number, the contract is not violated:
(define/contract (listofOne n)
…
Ben I.
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1
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1 answer
Spring cloud contract - integrating with non - spring endpoint
I have a spring webapp that communicates with external service over kafka. IS it possible to somehow test contract between those services?
user3364192
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1
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2 answers
Detect Share Contract in UWP
I know it is not possible to share files with other apps in xbox one, but I don't know how to check it? I guess it is using ApiInformation, but how?
Notice I know how to check the device family, but I'd like to check the feature instead, so when the…
Alvaro Rivoir
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1 answer
Duplication of properties in Data contract and BAL
I have a Silverlight Project which passes data using the Data Contract to a WCF service. The WCF method then invokes a BAL class which again has the same properties. Is there any way to avoid this duplication of properties ?
Chakra
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Setting and Getting multiple argument in a function using solidity
contract KYCCHECK{
function KYCCHECK(){}
struct User{
uint id;
bool isVerified;
string fname;
string mname;
string lname;
string genderValue;
string maritalStat;
string stat;
string identity;
}
mapping(uint…
Hem M
- 326
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1
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2 answers
Contract Testing with provider / producer code that we do not own (third party)
I have a question around testing! As of now, I'm in a unique situation where the software I am writing is going out to a third party vendor and storing some data. In this situation, writing a test to confirm that that data is posted successfully…
Drew L. Facchiano
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2 answers
What is the contract of a function or variable in TypeScript
I am a newbie at TypeScript and after installing it successfully on my machine, I came across the sentence "Type annotations in TypeScript are lightweight ways to record the intended contract of the function or variable" in TypeScript's official…
Aditya
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1
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2 answers
Accessing class private members from another class
I'm new to programming, and I'm starting with Java and Android. I want to create a database, so I've followed the offical documentation: https://developer.android.com/training/basics/data-storage/databases.html
My problem comes when, on the Contract…
Fran M.
- 79
- 5
1
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1 answer
Passing data into a callback, is data guaranteed to be received?
my question is: having a piece of code like that (communication via callback contract)
private void BroadcastMessage(DataEventArgs e)
{
DataEventHandler temp = DataEvent;
if (temp != null)
{
foreach (DataEventHandler handler in…
Tobiasz
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