From 93f011e1be508cb87dade679f45156ee0a47fa44 Mon Sep 17 00:00:00 2001
From: Matt Borland <matt@mattborland.com>
Date: Mon, 20 Mar 2023 15:59:26 -0700
Subject: [PATCH] Add extra parentheses for concept tests

---
 include/boost/math/ccmath/abs.hpp   | 2 +-
 include/boost/math/ccmath/isinf.hpp | 6 +++---
 include/boost/math/ccmath/isnan.hpp | 6 +++---
 include/boost/math/ccmath/ldexp.hpp | 4 ++--
 4 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/boost/math/ccmath/abs.hpp b/include/boost/math/ccmath/abs.hpp
index fa798eba12..84e01fba01 100644
--- a/include/boost/math/ccmath/abs.hpp
+++ b/include/boost/math/ccmath/abs.hpp
@@ -31,7 +31,7 @@ namespace detail {
 template <typename T> 
 constexpr T abs_impl(T x) noexcept
 {
-    if (boost::math::ccmath::isnan(x))
+    if ((boost::math::ccmath::isnan)(x))
     {
         return std::numeric_limits<T>::quiet_NaN();
     }
diff --git a/include/boost/math/ccmath/isinf.hpp b/include/boost/math/ccmath/isinf.hpp
index 706b9605c2..338f7a7b0b 100644
--- a/include/boost/math/ccmath/isinf.hpp
+++ b/include/boost/math/ccmath/isinf.hpp
@@ -22,7 +22,7 @@
 namespace boost::math::ccmath {
 
 template <typename T>
-constexpr bool isinf(T x) noexcept
+constexpr bool (isinf)(T x) noexcept
 {
     if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
     {
@@ -41,11 +41,11 @@ constexpr bool isinf(T x) noexcept
         
         if constexpr (!std::is_integral_v<T>)
         {
-            return isinf(x);
+            return (isinf)(x);
         }
         else
         {
-            return isinf(static_cast<double>(x));
+            return (isinf)(static_cast<double>(x));
         }
     }
 }
diff --git a/include/boost/math/ccmath/isnan.hpp b/include/boost/math/ccmath/isnan.hpp
index ca915a4642..2394abfb7c 100644
--- a/include/boost/math/ccmath/isnan.hpp
+++ b/include/boost/math/ccmath/isnan.hpp
@@ -21,7 +21,7 @@
 namespace boost::math::ccmath {
 
 template <typename T>
-inline constexpr bool isnan(T x)
+inline constexpr bool (isnan)(T x)
 {
     if(BOOST_MATH_IS_CONSTANT_EVALUATED(x))
     {
@@ -33,11 +33,11 @@ inline constexpr bool isnan(T x)
 
         if constexpr (!std::is_integral_v<T>)
         {
-            return isnan(x);
+            return (isnan)(x);
         }
         else
         {
-            return isnan(static_cast<double>(x));
+            return (isnan)(static_cast<double>(x));
         }
     }
 }
diff --git a/include/boost/math/ccmath/ldexp.hpp b/include/boost/math/ccmath/ldexp.hpp
index 92277706fb..31730b265f 100644
--- a/include/boost/math/ccmath/ldexp.hpp
+++ b/include/boost/math/ccmath/ldexp.hpp
@@ -45,8 +45,8 @@ inline constexpr Real ldexp(Real arg, int exp) noexcept
     if(BOOST_MATH_IS_CONSTANT_EVALUATED(arg))
     {
         return boost::math::ccmath::abs(arg) == Real(0) ? arg :
-               boost::math::ccmath::isinf(arg) ? arg :
-               boost::math::ccmath::isnan(arg) ? arg :
+               (boost::math::ccmath::isinf)(arg) ? arg :
+               (boost::math::ccmath::isnan)(arg) ? arg :
                boost::math::ccmath::detail::ldexp_impl(arg, exp);
     }
     else