Change TileOperand to a view of a tile object

* TileOperand instead of being the tile object now is only a view
  of a tile object.
  - declare_tile now returns a TileOperand object, not a reference
    to a TileOperand object.
  - This is to prepare for the posibility that the users need
    to perform operations on part of a tile (e.g. a scalar value,
    a vector, a sub-tile).

Partially resolves: COMPMID-6391
Signed-off-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Change-Id: I35c08b22a384a756d99dcd04cbe66fc57bd548d2
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9958
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>

1 files changed, 18 insertions, 6 deletions

diff --git a/compute_kernel_writer/include/ckw/TileOperand.h b/compute_kernel_writer/include/ckw/TileOperand.h
index abd3e0ac97..fe44b73e82 100644
--- a/compute_kernel_writer/include/ckw/TileOperand.h
+++ b/compute_kernel_writer/include/ckw/TileOperand.h
@@ -22,20 +22,32 @@
  * SOFTWARE.
  */
 
-#ifndef CKW_INCLUDE_CKW_TILEOPERAND
-#define CKW_INCLUDE_CKW_TILEOPERAND
+#ifndef CKW_INCLUDE_CKW_TILEOPERAND_H
+#define CKW_INCLUDE_CKW_TILEOPERAND_H
 
 namespace ckw
 {
 
-/** Tile operand which can be either scalar, vector or 2D tile. */
+class KernelWriter;
+class ITile;
+
+/** A tile operand refers to a tile object that can be used for kernel writing. */
 class TileOperand
 {
 public:
-    /* Destructor */
-    virtual ~TileOperand();
+    // The constructor and _tile field is completely hidden from the public API to avoid any misuse.
+    // Only kernel writer class interacts with tile operand hence we allow it to access this field.
+    friend class KernelWriter;
+
+private:
+    // These are hidden from the public API to avoid any misuse.
+
+    /** Initialize a new instance of @ref TileOperand class for the given tile. */
+    TileOperand(ITile &tile);
+
+    ITile &_tile;
 };
 
 } // namespace ckw
 
-#endif /* COMPUTE_KERNEL_WRITER_INCLUDE_CKW_TILEOPERAND */
+#endif // CKW_INCLUDE_CKW_TILEOPERAND_H