Update IFX_CharIter::Clone to return unique_ptr

This Cl converts the Clone method of IFX_CharIter to return a
unique_ptr. The usages were all converting to a unique_ptr already.

Change-Id: I1ca5ddd03eca8f21d616efb2b92fb27899c43c23
Reviewed-on: https://pdfium-review.googlesource.com/4351
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

4 files changed, 14 insertions, 8 deletions

diff --git a/core/fxcrt/cfx_chariter.cpp b/core/fxcrt/cfx_chariter.cpp
index c14db2f322..b726a7e484 100644
--- a/core/fxcrt/cfx_chariter.cpp
+++ b/core/fxcrt/cfx_chariter.cpp
@@ -6,6 +6,8 @@
 
 #include "core/fxcrt/cfx_chariter.h"
 
+#include "third_party/base/ptr_util.h"
+
 CFX_CharIter::CFX_CharIter(const CFX_WideString& wsText)
     : m_wsText(wsText), m_nIndex(0) {
   ASSERT(!wsText.IsEmpty());
@@ -44,8 +46,8 @@ bool CFX_CharIter::IsEOF(bool bTail) const {
   return bTail ? (m_nIndex + 1 == m_wsText.GetLength()) : (m_nIndex == 0);
 }
 
-IFX_CharIter* CFX_CharIter::Clone() {
-  CFX_CharIter* pIter = new CFX_CharIter(m_wsText);
+std::unique_ptr<IFX_CharIter> CFX_CharIter::Clone() {
+  auto pIter = pdfium::MakeUnique<CFX_CharIter>(m_wsText);
   pIter->m_nIndex = m_nIndex;
   return pIter;
 }
diff --git a/core/fxcrt/cfx_chariter.h b/core/fxcrt/cfx_chariter.h
index 00a725ef75..50fdde879f 100644
--- a/core/fxcrt/cfx_chariter.h
+++ b/core/fxcrt/cfx_chariter.h
@@ -7,6 +7,8 @@
 #ifndef CORE_FXCRT_CFX_CHARITER_H_
 #define CORE_FXCRT_CFX_CHARITER_H_
 
+#include <memory>
+
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
 #include "core/fxcrt/ifx_chariter.h"
@@ -21,7 +23,7 @@ class CFX_CharIter : public IFX_CharIter {
   void SetAt(int32_t nIndex) override;
   int32_t GetAt() const override;
   bool IsEOF(bool bTail = true) const override;
-  IFX_CharIter* Clone() override;
+  std::unique_ptr<IFX_CharIter> Clone() override;
 
  private:
   const CFX_WideString& m_wsText;
diff --git a/core/fxcrt/cfx_wordbreak.cpp b/core/fxcrt/cfx_wordbreak.cpp
index c236f599f2..2a31181403 100644
--- a/core/fxcrt/cfx_wordbreak.cpp
+++ b/core/fxcrt/cfx_wordbreak.cpp
@@ -2793,8 +2793,8 @@ void CFX_WordBreak::Attach(const CFX_WideString& wsText) {
 }
 
 bool CFX_WordBreak::Next(bool bPrev) {
-  std::unique_ptr<IFX_CharIter> pIter(
-      (bPrev ? m_pPreIter : m_pCurIter)->Clone());
+  std::unique_ptr<IFX_CharIter> pIter =
+      (bPrev ? m_pPreIter : m_pCurIter)->Clone();
   if (pIter->IsEOF(!bPrev))
     return false;
 
@@ -2819,7 +2819,7 @@ void CFX_WordBreak::SetAt(int32_t nIndex) {
   m_pCurIter->SetAt(nIndex);
   FindNextBreakPos(m_pCurIter.get(), true, false);
   m_pPreIter = std::move(m_pCurIter);
-  m_pCurIter.reset(m_pPreIter->Clone());
+  m_pCurIter = m_pPreIter->Clone();
   FindNextBreakPos(m_pCurIter.get(), false, false);
 }
 
@@ -2837,7 +2837,7 @@ void CFX_WordBreak::GetWord(CFX_WideString& wsWord) const {
     return;
   }
   wchar_t* lpBuf = wsWord.GetBuffer(nWordLength);
-  std::unique_ptr<IFX_CharIter> pTempIter(m_pPreIter->Clone());
+  std::unique_ptr<IFX_CharIter> pTempIter = m_pPreIter->Clone();
   int32_t i = 0;
   while (pTempIter->GetAt() <= m_pCurIter->GetAt()) {
     lpBuf[i++] = pTempIter->GetChar();
diff --git a/core/fxcrt/ifx_chariter.h b/core/fxcrt/ifx_chariter.h
index 4435257cc9..b8e240953a 100644
--- a/core/fxcrt/ifx_chariter.h
+++ b/core/fxcrt/ifx_chariter.h
@@ -7,6 +7,8 @@
 #ifndef CORE_FXCRT_IFX_CHARITER_H_
 #define CORE_FXCRT_IFX_CHARITER_H_
 
+#include <memory>
+
 #include "core/fxcrt/fx_system.h"
 
 class IFX_CharIter {
@@ -18,7 +20,7 @@ class IFX_CharIter {
   virtual void SetAt(int32_t nIndex) = 0;
   virtual int32_t GetAt() const = 0;
   virtual bool IsEOF(bool bTail = true) const = 0;
-  virtual IFX_CharIter* Clone() = 0;
+  virtual std::unique_ptr<IFX_CharIter> Clone() = 0;
 };
 
 #endif  // CORE_FXCRT_IFX_CHARITER_H_