diff --git a/wip/php/access/DoubleAccess.php b/wip/php/access/DoubleAccess.php
index 69344af..7c889c7 100644
--- a/wip/php/access/DoubleAccess.php
+++ b/wip/php/access/DoubleAccess.php
@@ -15,4 +15,37 @@ namespace nur\sery\wip\php\access;
  * {@link IGetter} attaquent de nouveau $reader comme initialement
  */
 class DoubleAccess extends AbstractAccess {
+  function __construct(IAccess $reader, IAccess $writer) {
+    $this->reader = $reader;
+    $this->writer = $writer;
+    $this->getter = $reader;
+  }
+
+  protected IAccess $reader;
+
+  protected IAccess $writer;
+
+  protected IGetter $getter;
+
+  function exists(): bool {
+    return $this->getter->exists();
+  }
+
+  function available(): bool {
+    return $this->getter->available();
+  }
+
+  function get($default=null) {
+    return $this->getter->get($default);
+  }
+
+  function set($value): void {
+    $this->writer->set($value);
+    $this->getter = $this->writer;
+  }
+
+  public function del(): void {
+    $this->writer->del();
+    $this->getter = $this->reader;
+  }
 }