Implicit does not cause type to be converted when expected

Question

package com.coryklein.lct.model import org.scalatest.FlatSpec import language.implicitConversions class VertexTest extends FlatSpec { case class Vertex(x: Double, y: Double) implicit def tupleWrapper(tuple: (Double, Double)): Vertex = new Vertex(tuple._1, tuple._2) "A Vertex" should "be implicitly created from a tuple" in { val v: Vertex = (0, 0) } }

In this code, the (0,0) doesn't get implicitly converted into a Vertex as I expect. Why?

Cory Klein · Accepted Answer · 2015-12-23 21:01:16Z

See your compiler error:

Error:(17, 21) type mismatch; found : (Int, Int) required: VertexTest.this.Vertex val v: Vertex = (0, 0) ^

The type of (0,0) is (Int,Int) which does not match the definition of the implicit you created which is (Double,Double), therefore your implicit cannot be applied.

To resolve your problem, change the types to match or define a new implicit conversion.

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