Comments (2)
/// <summary>
/// Atomically performs the following operation:
/// - If target is null: stores newValue in target and returns newValue.
/// - If target is not null: returns target.
/// </summary>
[return: NotNullIfNotNull("newValue")]
public static T? GetOrSet<T>(ref T? target, T? newValue) where T : class
{
T? oldValue = Interlocked.CompareExchange(ref target, newValue, null);
return oldValue ?? newValue;
}
This one is trivial: the nullability of the return value directly depends on the parameter and on no other nodes.
We could detect this special case after building the graph, annotate the method with the attribute, then rebuild the graph from scratch, since callers of the method will profit from the attribute (via 07b2d78), and perform inference as usual in a second pass.
from nullabilityinference.
A different case is something like this:
[return: NotNullIfNotNull("filename")]
public static Stream? OpenFile(string? filename)
{
if (filename == null)
return null;
return new FileStream(filename, FileMode.Open);
}
Here the graph shows no relation between the parameter and the return node.
We could maybe detect that all incoming edges for the return node were created by code under a if (param == null)
check (i.e. control-flow guaranteeing that the parameter being definitely null, not just potentially null as tracked by the flow-state implemented in #5).
from nullabilityinference.
Related Issues (6)
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from nullabilityinference.