Add inc/dec to counters

kmath-histograms/src/commonMain/kotlin/space/kscience/kmath/histogram/Counter.kt

@@ -8,7 +8,7 @@ package space.kscience.kmath.histogram
 import kotlinx.atomicfu.atomic
 import kotlinx.atomicfu.getAndUpdate
 import space.kscience.kmath.operations.DoubleField
-import space.kscience.kmath.operations.Ring
+import space.kscience.kmath.operations.Group
 
 /**
  * Common representation for atomic counters
@@ -18,7 +18,7 @@ public interface Counter<T : Any> {
     public val value: T
 
     public companion object {
-        public fun real(): ObjectCounter<Double> = ObjectCounter(DoubleField)
+        public fun double(): ObjectCounter<Double> = ObjectCounter(DoubleField)
     }
 }
 
@@ -32,6 +32,16 @@ public class IntCounter : Counter<Int> {
     override val value: Int get() = innerValue.value
 }
 
+public operator fun IntCounter.inc(): IntCounter {
+    add(1)
+    return this
+}
+
+public operator fun IntCounter.dec(): IntCounter {
+    add(-1)
+    return this
+}
+
 public class LongCounter : Counter<Long> {
     private val innerValue = atomic(0L)
 
@@ -42,7 +52,17 @@ public class LongCounter : Counter<Long> {
     override val value: Long get() = innerValue.value
 }
 
-public class ObjectCounter<T : Any>(public val group: Ring<T>) : Counter<T> {
+public operator fun LongCounter.inc(): LongCounter {
+    add(1L)
+    return this
+}
+
+public operator fun LongCounter.dec(): LongCounter {
+    add(-1L)
+    return this
+}
+
+public class ObjectCounter<T : Any>(private val group: Group<T>) : Counter<T> {
     private val innerValue = atomic(group.zero)
 
     override fun add(delta: T) {

kmath-histograms/src/commonMain/kotlin/space/kscience/kmath/histogram/DoubleHistogramSpace.kt

@@ -74,7 +74,7 @@ public class DoubleHistogramSpace(
     }
 
     override fun produce(builder: HistogramBuilder<Double>.() -> Unit): IndexedHistogram<Double, Double> {
-        val ndCounter = StructureND.auto(shape) { Counter.real() }
+        val ndCounter = StructureND.auto(shape) { Counter.double() }
         val hBuilder = HistogramBuilder<Double> { point, value ->
             val index = getIndex(point)
             ndCounter[index].add(value.toDouble())

kmath-histograms/src/commonMain/kotlin/space/kscience/kmath/histogram/IndexedHistogramSpace.kt

@@ -41,7 +41,6 @@ public class IndexedHistogram<T : Comparable<T>, V : Any>(
         get() = DefaultStrides(context.shape).asSequence().map {
             context.produceBin(it, values[it])
         }.asIterable()
-
 }
 
 /**

kmath-histograms/src/jvmMain/kotlin/space/kscience/kmath/histogram/TreeHistogramSpace.kt

@@ -39,7 +39,7 @@ public class TreeHistogram(
 @PublishedApi
 internal class TreeHistogramBuilder(val binFactory: (Double) -> UnivariateDomain) : UnivariateHistogramBuilder {
 
-    internal class BinCounter(val domain: UnivariateDomain, val counter: Counter<Double> = Counter.real()) :
+    internal class BinCounter(val domain: UnivariateDomain, val counter: Counter<Double> = Counter.double()) :
         ClosedFloatingPointRange<Double> by domain.range
 
     private val bins: TreeMap<Double, BinCounter> = TreeMap()

kmath-tensorflow/src/main/kotlin/space/kscience/kmath/tensorflow/TensorFlowAlgebra.kt

@@ -233,3 +233,5 @@ public abstract class TensorFlowAlgebra<T, TT : TType, A : Ring<T>> internal con
     override fun export(arg: StructureND<T>): StructureND<T> =
         if (arg is TensorFlowOutput<T, *>) arg.actualTensor else arg
 }
+
+//TODO add TensorFlow expressions