Comments (9)
johnynek
commented on June 12, 2024
1
Honestly it’s not that common to use Operators with Algebird.
I can look into it, but in the meantime I recommend you use Semigroup.plus on the companion.
It is probably an ambiguous implicit somewhere.
from algebird.
tovbinm
commented on June 12, 2024
In fact, same happens with simple tuples as well:
import com.twitter.algebird.Monoid._
import com.twitter.algebird.Operators._
val x = 1 -> 1
x + x // fails to compilefrom algebird.
johnynek
commented on June 12, 2024
Huh. This is very strange. Can you make a PR with a test to demonstrate the failure.
We use tuples with Semigroups all the time.
Why are you importing Monoid._? I wonder if you are setting up a conflicting implicit and scala just silently fails when two implicits can be found.
from algebird.
tovbinm
commented on June 12, 2024
The Monoid._ is mainly needed because of the ArrayMonoid
from algebird.
tovbinm
commented on June 12, 2024
Here you go - tovbinm@776cfe1
from algebird.
tovbinm
commented on June 12, 2024
Also, I think I found what's the problem - import order matters (at least in the test):
This would fail:
import com.twitter.algebird.Monoid._
import com.twitter.algebird.Operators._This works:
import com.twitter.algebird.Operators._
import com.twitter.algebird.Monoid._But in my project import order does not matter, so the problem persists.
from algebird.
tovbinm
commented on June 12, 2024
Here is the failure again in Ammonite:
Welcome to the Ammonite Repl 1.1.0
(Scala 2.12.4 Java 1.8.0_131)
If you like Ammonite, please support our development at www.patreon.com/lihaoyi
@ import $ivy.`com.twitter::algebird-core:0.13.4`
import $ivy.$
@ import com.twitter.algebird.Operators._
import com.twitter.algebird.Operators._
@ import com.twitter.algebird.Monoid._
import com.twitter.algebird.Monoid._
@ Array(1,2) -> Array(1,2) + Array(1,2) -> Array(1,2)
cmd3.sc:1: diverging implicit expansion for type algebra.Monoid[(Array[Int], Array[Int])]
starting with method fromAlgebraAdditiveMonoid in trait FromAlgebraMonoidImplicit1
val res3 = Array(1,2) -> Array(1,2) + Array(1,2) -> Array(1,2)
^
cmd3.sc:1: value + is not a member of (Array[Int], Array[Int])
val res3 = Array(1,2) -> Array(1,2) + Array(1,2) -> Array(1,2)
^
Compilation Failedfrom algebird.
johnynek
commented on June 12, 2024
But scala should search the Monoid companion. What if you don’t try the
Monoid import?
On Sun, Jul 29, 2018 at 05:45 Matthew Tovbin ***@***.***> wrote:
here is it in Ammonite:
Welcome to the Ammonite Repl 1.1.0
(Scala 2.12.4 Java 1.8.0_131)
If you like Ammonite, please support our development at www.patreon.com/lihaoyi
@ import $ivy.`com.twitter::algebird-core:0.13.4`
import $ivy.$
@ import com.twitter.algebird.Operators._
import com.twitter.algebird.Operators._
@ import com.twitter.algebird.Monoid._
import com.twitter.algebird.Monoid._
@ Array(1,2) + Array(1,1)cmd3.sc:1: diverging implicit expansion for type algebra.Monoid[Array[Int]]
starting with method fromAlgebraAdditiveMonoid in trait FromAlgebraMonoidImplicit1
val res3 = Array(1,2) + Array(1,1)
^cmd3.sc:1: value + is not a member of Array[Int]
val res3 = Array(1,2) + Array(1,1)
^
Compilation Failed
—
You are receiving this because you commented.
Reply to this email directly, view it on GitHub
<#661 (comment)>,
or mute the thread
<https://github.com/notifications/unsubscribe-auth/AAEJdjE0u-uFH2Yt1D3JiclwQfVqsNrEks5uLdirgaJpZM4VlNdl>
.
--
P. Oscar Boykin, Ph.D. | http://twitter.com/posco | http://pobox.com/~boykin
from algebird.
tovbinm
commented on June 12, 2024
Well, it assumes String in + operator then:
Welcome to the Ammonite Repl 1.1.0
(Scala 2.12.4 Java 1.8.0_131)
If you like Ammonite, please support our development at www.patreon.com/lihaoyi
@ import $ivy.`com.twitter::algebird-core:0.13.4`
import $ivy.$
@ import com.twitter.algebird._
import com.twitter.algebird._
@ import com.twitter.algebird.Operators._
import com.twitter.algebird.Operators._
@ (Array(1,2) -> Array(1,2)) + (Array(1,2) -> Array(1,2))
cmd3.sc:1: type mismatch;
found : (Array[Int], Array[Int])
required: String
val res3 = (Array(1,2) -> Array(1,2)) + (Array(1,2) -> Array(1,2))
^
Compilation Failedfrom algebird.
Related Issues (20)
- Release cadance of algebrid, next planned release? HOT 5
- New point release that includes BigDecimal semigroup HOT 10
- PriorityQueueMonoid- Is it strictly a monoid? HOT 3
- Algebird-spark with Spark 2.{3, 4} and Scala 2.12 HOT 2
- Scala 2.13.x HOT 13
- Idea: BloomFilterAggregator can directly rely on a BitSet instead of a BFMonoid
- use fast immutable bitset for better bloom filter HOT 6
- The GeneratedTupleAggregator is not recognized HOT 2
- Add combinators on Semigroup, Monoid, Aggregator to reverse order. HOT 1
- flakey test: downsiding HLL to 4 bits HOT 1
- investigate flaky test on AdaptiveVector
- Latest version published with `-optimize` HOT 1
- configure mergify.io HOT 1
- H
- Investigate flaky `com.twitter.algebird.CollectionSpecification` test HOT 8
- Possible buffer overflow for lengths over 127. Why are you doing .toByte in order to represent an integer size of 4 bytes? For example item length of 184 will result in -72 and thus in NegativeArraySize Exception when deserializing in fromBytes : 94. HOT 1
- Possible buffer overflow for lengths over 127. HOT 4
- SparseVector monoid flake
- New release? HOT 4
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 algebird.