From 4e8c9bd28fe6c6569814ffa3854544e11b1d346b Mon Sep 17 00:00:00 2001
From: Nathan Sashihara <21227491+n8sh@users.noreply.github.com>
Date: Fri, 19 Oct 2018 02:20:13 -0400
Subject: [PATCH] Use new __traits(isZeroInit) to check for a null initializer
 at compile time instead of runtime

---
 source/tanya/algorithm/mutation.d | 13 ++++++++++---
 source/tanya/conv.d               | 12 ++++++++++--
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/source/tanya/algorithm/mutation.d b/source/tanya/algorithm/mutation.d
index daff07c..550afdd 100644
--- a/source/tanya/algorithm/mutation.d
+++ b/source/tanya/algorithm/mutation.d
@@ -89,13 +89,20 @@ do
 
         static if (hasElaborateCopyConstructor!T || hasElaborateDestructor!T)
         {
-            if (typeid(T).initializer().ptr is null)
+            static if (__VERSION__ >= 2083) // __traits(isZeroInit) available.
             {
-                deinitialize!true(source);
+                deinitialize!(__traits(isZeroInit, T))(source);
             }
             else
             {
-                deinitialize!false(source);
+                if (typeid(T).initializer().ptr is null)
+                {
+                    deinitialize!true(source);
+                }
+                else
+                {
+                    deinitialize!false(source);
+                }
             }
         }
     }
diff --git a/source/tanya/conv.d b/source/tanya/conv.d
index 48cd11a..e19ea7f 100644
--- a/source/tanya/conv.d
+++ b/source/tanya/conv.d
@@ -185,8 +185,16 @@ out(result; memory.ptr is result)
         }
         else
         {
-            static const T init = T.init;
-            trustedCopy(init);
+            static if (__VERSION__ >= 2083 // __traits(isZeroInit) available.
+                && __traits(isZeroInit, T))
+            {
+                (() @trusted => memory.ptr[0 .. T.sizeof])().fill!0;
+            }
+            else
+            {
+                static immutable T init = T.init;
+                trustedCopy(init);
+            }
         }
         result.__ctor(args);
     }