From 45dcb68af047cdbd1d0467b82b07578cf2d981ae Mon Sep 17 00:00:00 2001
From: Egor Zhdan <e_zhdan@apple.com>
Date: Wed, 3 Sep 2025 16:21:55 +0100
Subject: [PATCH] [cxx-interop] Test initializing foreign reference type when
 passed by parameter

This only adds a test.
---
 .../Cxx/foreign-reference/Inputs/pass-as-parameter.h        | 4 ++++
 .../pass-as-parameter-module-interface.swift                | 2 ++
 test/Interop/Cxx/foreign-reference/pass-as-parameter.swift  | 6 ++++++
 3 files changed, 12 insertions(+)

diff --git a/test/Interop/Cxx/foreign-reference/Inputs/pass-as-parameter.h b/test/Interop/Cxx/foreign-reference/Inputs/pass-as-parameter.h
index c8221af076a95..b6375d354d034 100644
--- a/test/Interop/Cxx/foreign-reference/Inputs/pass-as-parameter.h
+++ b/test/Interop/Cxx/foreign-reference/Inputs/pass-as-parameter.h
@@ -14,3 +14,7 @@ inline int extractValueFromRefToPtr(IntBox *&b) { return b->value; }
 inline int extractValueFromRefToConstPtr(IntBox const *&b) { return b->value; }
 inline int extractValueFromConstRefToPtr(IntBox *const &b) { return b->value; }
 inline int extractValueFromConstRefToConstPtr(IntBox const *const &b) { return b->value; }
+
+inline void initializeByPtr(int value, IntBox **b) {
+  *b = IntBox::create(value);
+}
diff --git a/test/Interop/Cxx/foreign-reference/pass-as-parameter-module-interface.swift b/test/Interop/Cxx/foreign-reference/pass-as-parameter-module-interface.swift
index f71ea0c581338..b202258289692 100644
--- a/test/Interop/Cxx/foreign-reference/pass-as-parameter-module-interface.swift
+++ b/test/Interop/Cxx/foreign-reference/pass-as-parameter-module-interface.swift
@@ -7,3 +7,5 @@
 // CHECK: func extractValueFromRefToConstPtr(_ b: inout IntBox!) -> Int32
 // CHECK: func extractValueFromConstRefToPtr(_ b: IntBox!) -> Int32
 // CHECK: func extractValueFromConstRefToConstPtr(_ b: IntBox!) -> Int32
+
+// CHECK: func initializeByPtr(_ value: Int32, _ b: UnsafeMutablePointer<IntBox?>!)
diff --git a/test/Interop/Cxx/foreign-reference/pass-as-parameter.swift b/test/Interop/Cxx/foreign-reference/pass-as-parameter.swift
index 7e4ff5d3ddbd2..09f7c934121df 100644
--- a/test/Interop/Cxx/foreign-reference/pass-as-parameter.swift
+++ b/test/Interop/Cxx/foreign-reference/pass-as-parameter.swift
@@ -53,4 +53,10 @@ PassAsParameterTestSuite.test("pass as const reference to const pointer") {
   expectEqual(aValue, 789)
 }
 
+PassAsParameterTestSuite.test("initialize by pointer") {
+  var a: IntBox!
+  initializeByPtr(987, &a)
+  expectEqual(a.value, 987)
+}
+
 runAllTests()