From e819e5f81e76fa88955b19467edc83b7ca6a4ff9 Mon Sep 17 00:00:00 2001
From: Ben Wagner <bungeman@google.com>
Date: Tue, 28 Nov 2017 16:44:10 -0500
Subject: [PATCH] Update SkTLazy for move only types.

Change-Id: Id812d4f6ac47ae41e5a938310aa8f30eaf33a42d
Reviewed-on: https://skia-review.googlesource.com/76901
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Ben Wagner <bungeman@google.com>
---
 include/core/SkTLazy.h | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/include/core/SkTLazy.h b/include/core/SkTLazy.h
index cb08387bb9..39ebdbef4a 100644
--- a/include/core/SkTLazy.h
+++ b/include/core/SkTLazy.h
@@ -24,7 +24,8 @@ public:
     explicit SkTLazy(const T* src)
         : fPtr(src ? new (fStorage.get()) T(*src) : nullptr) {}
 
-    SkTLazy(const SkTLazy& src) : fPtr(nullptr) { *this = src; }
+    SkTLazy(const SkTLazy& that) : fPtr(nullptr) { *this = that; }
+    SkTLazy(SkTLazy&& that) : fPtr(nullptr) { *this = std::move(that); }
 
     ~SkTLazy() {
         if (this->isValid()) {
@@ -32,9 +33,18 @@ public:
         }
     }
 
-    SkTLazy& operator=(const SkTLazy& src) {
-        if (src.isValid()) {
-            this->set(*src.get());
+    SkTLazy& operator=(const SkTLazy& that) {
+        if (that.isValid()) {
+            this->set(*that.get());
+        } else {
+            this->reset();
+        }
+        return *this;
+    }
+
+    SkTLazy& operator=(SkTLazy&& that) {
+        if (that.isValid()) {
+            this->set(std::move(*that.get()));
         } else {
             this->reset();
         }
@@ -70,6 +80,15 @@ public:
         return fPtr;
     }
 
+    T* set(T&& src) {
+        if (this->isValid()) {
+            *fPtr = std::move(src);
+        } else {
+            fPtr = new (SkTCast<T*>(fStorage.get())) T(std::move(src));
+        }
+        return fPtr;
+    }
+
     /**
      * Destroy the lazy object (if it was created via init() or set())
      */