From 4edaeb508132a38aaac2484facca630fa36fbd55 Mon Sep 17 00:00:00 2001
From: Robin Caloudis <robin.caloudis@gmx.de>
Date: Mon, 15 Jul 2024 22:05:20 +0200
Subject: [PATCH] Test convertibles in std::isnan()

---
 .../test/std/numerics/c.math/isnan.pass.cpp   | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/libcxx/test/std/numerics/c.math/isnan.pass.cpp b/libcxx/test/std/numerics/c.math/isnan.pass.cpp
index fffb1246458629..374aa08a600d60 100644
--- a/libcxx/test/std/numerics/c.math/isnan.pass.cpp
+++ b/libcxx/test/std/numerics/c.math/isnan.pass.cpp
@@ -62,9 +62,30 @@ struct TestInt {
   }
 };
 
+struct ConvertibleFloat {
+  int value;
+  ConvertibleFloat(int v) : value(v) {}
+  operator float() const { return static_cast<float>(value); }
+};
+
+struct ConvertibleDouble {
+  int value;
+  ConvertibleDouble(int v) : value(v) {}
+  operator double() const { return static_cast<double>(value); }
+};
+
+struct ConvertibleLongDouble {
+  int value;
+  ConvertibleLongDouble(int v) : value(v) {}
+  operator long double() const { return static_cast<long double>(value); }
+};
+
 int main(int, char**) {
   types::for_each(types::floating_point_types(), TestFloat());
   types::for_each(types::integral_types(), TestInt());
+  assert(!std::isnan(ConvertibleFloat(0)));
+  assert(!std::isnan(ConvertibleDouble(0)));
+  assert(!std::isnan(ConvertibleLongDouble(0)));
 
   return 0;
 }