From e85eefb89a9d8200f78af154cf701f4d46716b57 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludvig=20Gunne=20Lindstr=C3=B6m?=
 <ludviggunnelindstrom@gmail.com>
Date: Thu, 16 Apr 2026 15:08:16 +0200
Subject: [PATCH 1/3] update test

---
 test/testother.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/testother.cpp b/test/testother.cpp
index bac5dfbdf7f..6b808fd40b0 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -2909,7 +2909,7 @@ class TestOther : public TestFixture {
         check("struct X { int a[5]; }; extern \"C\" void f(X v) { }");
         ASSERT_EQUALS("", errout_str());
 
-        check("struct X { int a[5]; }; void f(const X v);");
+        check("struct X { int a[5]; }; void f(const X v) { (void) v; }");
         ASSERT_EQUALS("[test.cpp:1:40]: (performance) Function parameter 'v' should be passed by const reference. [passedByValue]\n", errout_str());
 
         check("extern \"C\" { struct X { int a[5]; }; void f(const X v); }");

From 713c70c2dafc625e909261b64fa05a501b9806bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludvig=20Gunne=20Lindstr=C3=B6m?=
 <ludviggunnelindstrom@gmail.com>
Date: Thu, 16 Apr 2026 15:17:14 +0200
Subject: [PATCH 2/3] add test

---
 test/testother.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/testother.cpp b/test/testother.cpp
index 6b808fd40b0..e55d34c44a5 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -4108,6 +4108,14 @@ class TestOther : public TestFixture {
               "    if (*pp) {}\n"
               "}\n");
         ASSERT_EQUALS("", errout_str());
+
+        check("class C {\n"
+              "public:\n"
+              "    explicit C(const std::string s);\n"
+              "private:\n"
+              "    std::string _s;\n"
+              "};\n");
+        ASSERT_EQUALS("", errout_str());
     }
 
     void constParameterCallback() {

From 0a6633ed693b0caa02500b8b17977c08991bf68e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludvig=20Gunne=20Lindstr=C3=B6m?=
 <ludviggunnelindstrom@gmail.com>
Date: Thu, 16 Apr 2026 15:08:11 +0200
Subject: [PATCH 3/3] fix

---
 lib/checkother.cpp | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index 13ad6d29577..7edc19f533e 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -1591,8 +1591,23 @@ void CheckOther::checkPassByReference()
         if (var->isArray() && (!var->isStlType() || Token::simpleMatch(var->nameToken()->next(), "[")))
             continue;
 
+        bool argWithNoBody = false;
+        if (var->isArgument()) {
+            const Token *tok = var->nameToken();
+            for (; tok; tok = tok->next()) {
+                if (Token::simpleMatch(tok, "(")) {
+                    tok = tok->link();
+                    continue;
+                }
+                if (Token::simpleMatch(tok, ")"))
+                    break;
+            }
+
+            argWithNoBody = Token::simpleMatch(tok, ") ;");
+        }
+
         const bool isConst = var->isConst();
-        if (isConst) {
+        if (isConst && !argWithNoBody) {
             passedByValueError(var, inconclusive, isRangeBasedFor);
             continue;
         }