From 8636c30d820fa6cd390345c0f3fe333a6e5e1f0d Mon Sep 17 00:00:00 2001
From: Samaresh Kumar Singh <ssam3003@gmail.com>
Date: Sat, 4 Apr 2026 12:34:21 -0500
Subject: [PATCH] Add converting constructors to multi_ptr for generic address
 space

The generic_space specialization had copy and move operator= overloads
that accept a multi_ptr with any non-constant address space, but no
matching constructors. This made implicit conversion from a specific
address space pointer to generic_ptr impossible in initialization and
function call contexts. Added the corresponding copy and move
constructors with the same constraints as the existing operator= overloads.
---
 adoc/chapters/programming_interface.adoc | 22 ++++++++++++++++++++++
 adoc/headers/multipointer.h              | 12 ++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/adoc/chapters/programming_interface.adoc b/adoc/chapters/programming_interface.adoc
index 6a00a8de5..8a9a09f0f 100644
--- a/adoc/chapters/programming_interface.adoc
+++ b/adoc/chapters/programming_interface.adoc
@@ -10384,6 +10384,28 @@ multi_ptr(std::nullptr_t)
 ----
    a@ Constructor from a [code]#nullptr#.
 
+a@
+[source]
+----
+template <access::address_space AS, access::decorated IsDecorated>
+multi_ptr(const multi_ptr<value_type, AS, IsDecorated>&)
+----
+   a@ Available only when:
+      [code]#(Space == access::address_space::generic_space && AS != access::address_space::constant_space)#.
+
+Constructs a [code]#generic_ptr# by copying the value of the right hand side [code]#multi_ptr#.
+
+a@
+[source]
+----
+template <access::address_space AS, access::decorated IsDecorated>
+multi_ptr(multi_ptr<value_type, AS, IsDecorated>&&)
+----
+   a@ Available only when:
+      [code]#(Space == access::address_space::generic_space && AS != access::address_space::constant_space)#.
+
+Constructs a [code]#generic_ptr# by moving the value of the right hand side [code]#multi_ptr#.
+
 a@
 [source]
 ----
diff --git a/adoc/headers/multipointer.h b/adoc/headers/multipointer.h
index ab960bb0c..a66c6d409 100644
--- a/adoc/headers/multipointer.h
+++ b/adoc/headers/multipointer.h
@@ -64,6 +64,18 @@ class multi_ptr {
       typename multi_ptr<ElementType, Space, access::decorated::yes>::pointer);
   multi_ptr(std::nullptr_t);
 
+  // Available only when:
+  //   (Space == access::address_space::generic_space &&
+  //    AS != access::address_space::constant_space)
+  template <access::address_space AS, access::decorated IsDecorated>
+  multi_ptr(const multi_ptr<value_type, AS, IsDecorated>&);
+
+  // Available only when:
+  //   (Space == access::address_space::generic_space &&
+  //    AS != access::address_space::constant_space)
+  template <access::address_space AS, access::decorated IsDecorated>
+  multi_ptr(multi_ptr<value_type, AS, IsDecorated>&&);
+
   // Available only when:
   //   (Space == access::address_space::global_space ||
   //    Space == access::address_space::generic_space) &&