From 3e8ff3e586aae8bd89ea0e272fabbea3bd836aa6 Mon Sep 17 00:00:00 2001
From: conrad <conrad@localhost.localdomain>
Date: Wed, 22 Sep 2021 01:16:39 +1000
Subject: [PATCH] warn on unused result

---
 include/armadillo_bits/BaseCube_bones.hpp | 2 +-
 include/armadillo_bits/BaseCube_meat.hpp  | 3 ++-
 include/armadillo_bits/SpBase_bones.hpp   | 2 +-
 include/armadillo_bits/SpBase_meat.hpp    | 1 +
 4 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/armadillo_bits/BaseCube_bones.hpp b/include/armadillo_bits/BaseCube_bones.hpp
index cb6e23ea..3c96e048 100644
--- a/include/armadillo_bits/BaseCube_bones.hpp
+++ b/include/armadillo_bits/BaseCube_bones.hpp
@@ -31,7 +31,7 @@ struct BaseCube_eval_Cube
 template<typename elem_type, typename derived>
 struct BaseCube_eval_expr
   {
-  arma_inline Cube<elem_type> eval() const;   //!< force the immediate evaluation of a delayed expression
+  inline arma_warn_unused Cube<elem_type> eval() const;   //!< force the immediate evaluation of a delayed expression
   };
 
 
diff --git a/include/armadillo_bits/BaseCube_meat.hpp b/include/armadillo_bits/BaseCube_meat.hpp
index 89974a6b..ac90d99d 100644
--- a/include/armadillo_bits/BaseCube_meat.hpp
+++ b/include/armadillo_bits/BaseCube_meat.hpp
@@ -431,7 +431,8 @@ BaseCube_eval_Cube<elem_type, derived>::eval() const
 // extra functions defined in BaseCube_eval_expr
 
 template<typename elem_type, typename derived>
-arma_inline
+inline
+arma_warn_unused
 Cube<elem_type>
 BaseCube_eval_expr<elem_type, derived>::eval() const
   {
diff --git a/include/armadillo_bits/SpBase_bones.hpp b/include/armadillo_bits/SpBase_bones.hpp
index b5c06883..137de447 100644
--- a/include/armadillo_bits/SpBase_bones.hpp
+++ b/include/armadillo_bits/SpBase_bones.hpp
@@ -31,7 +31,7 @@ struct SpBase_eval_SpMat
 template<typename elem_type, typename derived>
 struct SpBase_eval_expr
   {
-  inline SpMat<elem_type> eval() const;   //!< force the immediate evaluation of a delayed expression
+  inline arma_warn_unused SpMat<elem_type> eval() const;   //!< force the immediate evaluation of a delayed expression
   };
 
 
diff --git a/include/armadillo_bits/SpBase_meat.hpp b/include/armadillo_bits/SpBase_meat.hpp
index 9ce00352..3fc87cc6 100644
--- a/include/armadillo_bits/SpBase_meat.hpp
+++ b/include/armadillo_bits/SpBase_meat.hpp
@@ -330,6 +330,7 @@ SpBase_eval_SpMat<elem_type, derived>::eval() const
 
 template<typename elem_type, typename derived>
 inline
+arma_warn_unused
 SpMat<elem_type>
 SpBase_eval_expr<elem_type, derived>::eval() const
   {