From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Mon, 14 Aug 2017 05:21:36 +0000 (+0200)
Subject: Deprecate constraint_and_return_value in favor of std::enable_if
X-Git-Tag: v9.0.0-rc1~1259^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1f80aed157d8dccd58e189f0619ff60a14dc8009;p=dealii.git

Deprecate constraint_and_return_value in favor of std::enable_if
---

diff --git a/include/deal.II/base/template_constraints.h b/include/deal.II/base/template_constraints.h
index 1ea8046798..bbaa6de0f8 100644
--- a/include/deal.II/base/template_constraints.h
+++ b/include/deal.II/base/template_constraints.h
@@ -81,12 +81,14 @@ template <bool, typename> struct constraint_and_return_value;
  * constraint_and_return_value template is true, then the return type is just
  * the second type in the template.
  *
+ * @deprecated Use std::enable_if instead.
+ *
  * @author Wolfgang Bangerth, 2003
  */
 template <typename T> struct constraint_and_return_value<true,T>
 {
   typedef T type;
-};
+} DEAL_II_DEPRECATED;
 
 
 
diff --git a/source/grid/grid_refinement.cc b/source/grid/grid_refinement.cc
index 1fe51cb306..fde982e36f 100644
--- a/source/grid/grid_refinement.cc
+++ b/source/grid/grid_refinement.cc
@@ -86,7 +86,7 @@ namespace internal
       DEAL_II_ENABLE_EXTRA_DIAGNOSTICS
 
       template <typename VectorType>
-      typename constraint_and_return_value<!IsBlockVector<VectorType>::value,
+      typename std::enable_if<!IsBlockVector<VectorType>::value,
                typename VectorType::value_type>::type
                min_element (const VectorType &criteria)
       {
@@ -95,7 +95,7 @@ namespace internal
 
 
       template <typename VectorType>
-      typename constraint_and_return_value<!IsBlockVector<VectorType>::value,
+      typename std::enable_if<!IsBlockVector<VectorType>::value,
                typename VectorType::value_type>::type
                max_element (const VectorType &criteria)
       {
@@ -104,7 +104,7 @@ namespace internal
 
 
       template <typename VectorType>
-      typename constraint_and_return_value<IsBlockVector<VectorType>::value,
+      typename std::enable_if<IsBlockVector<VectorType>::value,
                typename VectorType::value_type>::type
                min_element (const VectorType &criteria)
       {
@@ -117,7 +117,7 @@ namespace internal
 
 
       template <typename VectorType>
-      typename constraint_and_return_value<IsBlockVector<VectorType>::value,
+      typename std::enable_if<IsBlockVector<VectorType>::value,
                typename VectorType::value_type>::type
                max_element (const VectorType &criteria)
       {