From 2bc62356d6da378f2aae87cc830a119f13f03af5 Mon Sep 17 00:00:00 2001
From: Iaroslav Postovalov <postovalovya@gmail.com>
Date: Thu, 27 Aug 2020 16:44:58 +0700
Subject: [PATCH] Fix compilation issues

---
 .../kotlin/scientifik/kmath/structures/BoxingNDField.kt        | 3 ++-
 .../kotlin/scientifik/kmath/structures/BoxingNDRing.kt         | 3 ++-
 .../kotlin/scientifik/kmath/structures/BufferedNDAlgebra.kt    | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDField.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDField.kt
index 4cbb565c1..29e0ba276 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDField.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDField.kt
@@ -14,8 +14,9 @@ class BoxingNDField<T, F : Field<T>>(
     fun buildBuffer(size: Int, initializer: (Int) -> T): Buffer<T> =
         bufferFactory(size, initializer)
 
-    override fun check(vararg elements: NDBuffer<T>) {
+    override fun check(vararg elements: NDBuffer<T>): Array<out NDBuffer<T>> {
         if (!elements.all { it.strides == this.strides }) error("Element strides are not the same as context strides")
+        return elements
     }
 
     override val zero: BufferedNDFieldElement<T, F> by lazy { produce { zero } }
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDRing.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDRing.kt
index f7be95736..8aabe169a 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDRing.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BoxingNDRing.kt
@@ -14,8 +14,9 @@ class BoxingNDRing<T, R : Ring<T>>(
     fun buildBuffer(size: Int, initializer: (Int) -> T): Buffer<T> =
         bufferFactory(size, initializer)
 
-    override fun check(vararg elements: NDBuffer<T>) {
+    override fun check(vararg elements: NDBuffer<T>): Array<out NDBuffer<T>> {
         if (!elements.all { it.strides == this.strides }) error("Element strides are not the same as context strides")
+        return elements
     }
 
     override val zero: BufferedNDRingElement<T, R> by lazy { produce { zero } }
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BufferedNDAlgebra.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BufferedNDAlgebra.kt
index 06922c56f..de8a150c6 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BufferedNDAlgebra.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/BufferedNDAlgebra.kt
@@ -5,8 +5,9 @@ import scientifik.kmath.operations.*
 interface BufferedNDAlgebra<T, C> : NDAlgebra<T, C, NDBuffer<T>> {
     val strides: Strides
 
-    override fun check(vararg elements: NDBuffer<T>) {
+    override fun check(vararg elements: NDBuffer<T>): Array<out NDBuffer<T>> {
         if (!elements.all { it.strides == this.strides }) error("Strides mismatch")
+        return elements
     }
 
     /**