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Questions tagged [contract]

424 questions
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C++2a contract programming and compilers

I'm interested in studying the recently accepted contract programming for C++20 for learning and investigation purpose. As I'm looking around for compiler support, I'm disappointed to not find any. Both gcc and clang are quite clear they do not…
Cyan
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Removing the "integration test scam" - Understanding collaboration and contract tests

I've recently watched Integration Tests are a Scam by J. B. Rainsberger and am now looking for more material on the subject. I have to say, I'm shocked by how much we're doing wrong, (i.e. integration testing when we should unit test), intrigued by…
Pete
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Portable / Interoperable WCF Contracts

I was wondering if anybody out there had some good tips/dos and don'ts for designing WCF contracts with a mind for web-service interoperability, both in terms of older Microsoft web service technologies (e.g. WSE) and non-Microsoft technologies…
Randolpho
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9
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How can I place validating constraints on my method input parameters?

Here is the typical way of accomplishing this goal: public void myContractualMethod(final String x, final Set y) { if ((x == null) || (x.isEmpty())) { throw new IllegalArgumentException("x cannot be null or empty"); } if…
Robert Campbell
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8
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1 answer

Contract.Requires vs Contract.Require

I noticed that Microsoft named their code-contract-relative functions in .NET 4 in a strange manner. They add "s" at the end of "require" and "ensure", so there are Contract.Requires() and Contract.Ensures(), but not at the end of "assert" and…
ani
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4 answers

How can I enforce a contract within a struct

I'd like to enforce a struct to always be valid regarding a certain contract, enforced by the constructor. However the contract is violated by the default operator. Consider the following, for example: struct NonNullInteger { private readonly…
user703016
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What do I need to know before I sell a software license?

I've developed a web-based application that a company is interested in licensing. I suspect they intend to appropriate the features they want, and add to their existing codebase, so a license is likely to be a one-time affair. Since it's interpreted…
scottburton11
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definition of base has to precede definition of derived contract

I have two different files which are Project1.sol and Project2.sol Project2.sol is like: import "./Project1.sol"; contract Project2{ address newProject1Address =address(new Project1()); } Project1.sol is like: import…
jazz kek
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6
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2 answers

AndroidResultContracts.TakePicture() returns Boolean instead of Bitmap

The contract has been changed to return Boolean instead of Bitmap starting in androidx.activity version 1.2.0-alpha05. How can I use the Boolean returned by the built in AndroidResultContracts.TakePicture() contract to access and display the photo…
Sampson
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1 answer

Network up to date on truffle deploy

I've been working with solidity and truffle for a few days to develop a contract. I'm testing using the network created by Ganache an RPC client for build a local blockchain enviroment. There is one thing I do not understand though. I follow these…
Alberto Favaro
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How do I update my free apps when Apple ask me to "Review the updated Paid Applications Schedule"?

Summary: Do I need to accept the "Paid Applications" contract from Apple on iTunesConnect to update my free apps? If not, what are the steps I should follow to update my free app? Details: I'm trying to update a free app. I login to iTunes Connect…
Henry Yang
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5
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2 answers

How to get random number in Solana on-chain program?

I have just jumped in Solana on-chain program. I am going to make coin game which judge frontside or backside. I tried to use std:: rand and get_random crate but they don't work. If you have experience about it, please let me know. I use anchor for…
David Nasaw
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3 answers

PACT .NET consumer test: flexible length array

I am using pactNet to test an API which should return an array of a flexible length. If i call "myApi/items/" it should return a list of items where the consumer does not know the exact size of. So the answer should look like this: [ { …
Kevin Schäfer
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5
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4 answers

Should hashCode() only use the subset of immutable fields of those used in equals()?

Situation I needed to overwrite equals() and as it is recommended I also overwrote the hashCode() method using the same fields. Then, when I was looking at a set, that contained only the one object I got the frustrating result…
aryavie
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Getting the length of public array variable (getter)

I am trying to get the length of array from another contact. How? contract Lottery { unint[] public bets; } contract CheckLottery { function CheckLottery() { Lottery.bets.length; } }
RFV
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