Make SkString movable.

src/core/SkString.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkAtomics.h"
@@ skipping 257 matching lines @@
 SkString::SkString(const char text[], size_t len) {
     fRec = AllocRec(text, len);
 }
 
 SkString::SkString(const SkString& src) {
     src.validate();
 
     fRec = RefRec(src.fRec);
 }
 
+SkString::SkString(SkString&& src) {
+    src.validate();
+
+    fRec = src.fRec;
+    src.fRec = const_cast<Rec*>(&gEmptyRec);
+}
+
 SkString::~SkString() {
     this->validate();
 
     if (fRec->fLength) {
         SkASSERT(fRec->fRefCnt > 0);
         if (sk_atomic_dec(&fRec->fRefCnt) == 1) {
             sk_free(fRec);
         }
     }
 }
@@ skipping 15 matching lines @@
 SkString& SkString::operator=(const SkString& src) {
     this->validate();
 
     if (fRec != src.fRec) {
         SkString    tmp(src);
         this->swap(tmp);
     }
     return *this;
 }
 
+SkString& SkString::operator=(SkString&& src) {
+    this->validate();
+
+    if (fRec != src.fRec) {
+        this->swap(src);
+    }
+    return *this;
+}
+
 SkString& SkString::operator=(const char text[]) {
     this->validate();
 
     SkString tmp(text);
     this->swap(tmp);
 
     return *this;
 }
 
 void SkString::reset() {
@@ skipping 327 matching lines @@
             str += strspn(str, delimiters);
         } else {
             // Skip one delimiter.
             str += 1;
         }
     }
 }
 
 #undef VSNPRINTF
 #undef SNPRINTF