From 7aec0e45bda6e80385c99aadcb420b034f7eccd5 Mon Sep 17 00:00:00 2001
From: Adam Wulkiewicz <adam.wulkiewicz@gmail.com>
Date: Sun, 12 Apr 2015 15:08:55 +0200
Subject: [PATCH] [core] Add/improve ignore_unused() function specifiers.

Add C++14 constexpr by BOOST_CXX14_CONSTEXPR.
Replace inline with BOOST_FORCEINLINE.
---
 include/boost/core/ignore_unused.hpp | 24 ++++++++++++------------
 test/ignore_unused_test.cpp          | 11 +++++++++++
 2 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/include/boost/core/ignore_unused.hpp b/include/boost/core/ignore_unused.hpp
index 22047c2..994e5f6 100644
--- a/include/boost/core/ignore_unused.hpp
+++ b/include/boost/core/ignore_unused.hpp
@@ -14,53 +14,53 @@ namespace boost {
 #ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
 
 template <typename... Ts>
-inline void ignore_unused(Ts const& ...)
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(Ts const& ...)
 {}
 
 template <typename... Ts>
-inline void ignore_unused()
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused()
 {}
 
 #else
 
 template <typename T1>
-inline void ignore_unused(T1 const&)
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&)
 {}
 
 template <typename T1, typename T2>
-inline void ignore_unused(T1 const&, T2 const&)
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&)
 {}
 
 template <typename T1, typename T2, typename T3>
-inline void ignore_unused(T1 const&, T2 const&, T3 const&)
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&, T3 const&)
 {}
 
 template <typename T1, typename T2, typename T3, typename T4>
-inline void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&)
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&)
 {}
 
 template <typename T1, typename T2, typename T3, typename T4, typename T5>
-inline void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&, T5 const&)
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused(T1 const&, T2 const&, T3 const&, T4 const&, T5 const&)
 {}
 
 template <typename T1>
-inline void ignore_unused()
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused()
 {}
 
 template <typename T1, typename T2>
-inline void ignore_unused()
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused()
 {}
 
 template <typename T1, typename T2, typename T3>
-inline void ignore_unused()
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused()
 {}
 
 template <typename T1, typename T2, typename T3, typename T4>
-inline void ignore_unused()
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused()
 {}
 
 template <typename T1, typename T2, typename T3, typename T4, typename T5>
-inline void ignore_unused()
+BOOST_FORCEINLINE BOOST_CXX14_CONSTEXPR void ignore_unused()
 {}
 
 #endif
diff --git a/test/ignore_unused_test.cpp b/test/ignore_unused_test.cpp
index 4c81aaf..67bdd80 100644
--- a/test/ignore_unused_test.cpp
+++ b/test/ignore_unused_test.cpp
@@ -6,6 +6,12 @@
 
 #include <boost/core/ignore_unused.hpp>
 
+BOOST_CXX14_CONSTEXPR int test_fun(int a)
+{
+    boost::ignore_unused(a);
+    return 0;
+}
+
 int main()
 {
     {
@@ -60,5 +66,10 @@ int main()
         boost::ignore_unused<a, b, c, d, e>();
     }
 
+    {
+        BOOST_CXX14_CONSTEXPR const int a = test_fun(0);
+        boost::ignore_unused(a);
+    }
+
     return 0;
 }