From 52918b069fbf29d038033cd2bf62dd8b1c7bc0c3 Mon Sep 17 00:00:00 2001
From: Ichthyostega <prg@ichthyostega.de>
Date: Sat, 30 Jul 2016 21:54:16 +0200
Subject: [PATCH] metaprogramming: trait to detect smart-pointers

---
 src/lib/meta/trait.hpp | 18 ++++++++++++++++++
 src/lib/meta/util.hpp  |  9 +++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/lib/meta/trait.hpp b/src/lib/meta/trait.hpp
index 49e0ebd76..e9920f9c1 100644
--- a/src/lib/meta/trait.hpp
+++ b/src/lib/meta/trait.hpp
@@ -319,6 +319,24 @@ namespace meta {
   
   
   
+  /** detect smart pointers */
+  template<typename X>
+  struct is_smart_ptr
+    : std::false_type
+    { };
+  
+  template<typename T>
+  struct is_smart_ptr<std::shared_ptr<T>>
+    : std::true_type
+    { };
+  
+  template <typename T, typename D>
+  struct is_smart_ptr<std::unique_ptr<T,D>>
+    : std::true_type
+    { };
+  
+  
+  
   
   
   
diff --git a/src/lib/meta/util.hpp b/src/lib/meta/util.hpp
index 15735a923..0cdc3db58 100644
--- a/src/lib/meta/util.hpp
+++ b/src/lib/meta/util.hpp
@@ -52,6 +52,15 @@ namespace std { // forward declaration for std::string...
   class basic_string;
   
   using string = basic_string<char, char_traits<char>, allocator<char>>;
+  
+  
+  // forward declarations for common smart ptrs
+  template<typename T>
+  class shared_ptr;
+  
+  template <typename T, typename D>
+  class unique_ptr;
+  
 }