[libcxx-commits] [libcxx] [libc++] Fix acceptance of convertible-to-{float, double, long double} in std::isfinite() (PR #98841)

[Nikolas Klauser via libcxx-commits]

================
@@ -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); }
+};
+
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philnik777 wrote:

```suggestion
template <class T>
struct ConvertibleTo {
  operator T() const { return {}; }
};
```
And then use `ConvertibleTo<float>` below.

https://github.com/llvm/llvm-project/pull/98841