Take advantage of implicit std::unique_ptr<>(nulltpr_t) ctor.

Review-Url: https://codereview.chromium.org/2453163002

5 files changed, 12 insertions, 11 deletions

diff --git a/core/fpdfapi/font/cpdf_font.cpp b/core/fpdfapi/font/cpdf_font.cpp
index d39f752a8b..c5da4ea519 100644
--- a/core/fpdfapi/font/cpdf_font.cpp
+++ b/core/fpdfapi/font/cpdf_font.cpp
@@ -343,7 +343,7 @@ std::unique_ptr<CPDF_Font> CPDF_Font::Create(CPDF_Document* pDoc,
   pFont->m_pFontDict = pFontDict;
   pFont->m_pDocument = pDoc;
   pFont->m_BaseFont = pFontDict->GetStringFor("BaseFont");
-  return pFont->Load() ? std::move(pFont) : std::unique_ptr<CPDF_Font>();
+  return pFont->Load() ? std::move(pFont) : nullptr;
 }
 
 uint32_t CPDF_Font::GetNextChar(const FX_CHAR* pString,
diff --git a/core/fpdfapi/page/cpdf_clippath.cpp b/core/fpdfapi/page/cpdf_clippath.cpp
index 8c268a1b5e..9d4b737d33 100644
--- a/core/fpdfapi/page/cpdf_clippath.cpp
+++ b/core/fpdfapi/page/cpdf_clippath.cpp
@@ -100,7 +100,7 @@ void CPDF_ClipPath::AppendTexts(
   if (pData->m_TextList.size() + pTexts->size() <= FPDF_CLIPPATH_MAX_TEXTS) {
     for (size_t i = 0; i < pTexts->size(); i++)
       pData->m_TextList.push_back(std::move((*pTexts)[i]));
-    pData->m_TextList.push_back(std::unique_ptr<CPDF_TextObject>());
+    pData->m_TextList.push_back(nullptr);
   }
   pTexts->clear();
 }
diff --git a/core/fpdfapi/page/cpdf_colorspace.cpp b/core/fpdfapi/page/cpdf_colorspace.cpp
index fe840d10df..e43bacc079 100644
--- a/core/fpdfapi/page/cpdf_colorspace.cpp
+++ b/core/fpdfapi/page/cpdf_colorspace.cpp
@@ -332,7 +332,7 @@ CPDF_ColorSpace* CPDF_ColorSpace::GetStockCS(int family) {
 std::unique_ptr<CPDF_ColorSpace> CPDF_ColorSpace::Load(CPDF_Document* pDoc,
                                                        CPDF_Object* pObj) {
   if (!pObj)
-    return std::unique_ptr<CPDF_ColorSpace>();
+    return nullptr;
 
   if (pObj->IsName()) {
     return std::unique_ptr<CPDF_ColorSpace>(
@@ -341,7 +341,7 @@ std::unique_ptr<CPDF_ColorSpace> CPDF_ColorSpace::Load(CPDF_Document* pDoc,
   if (CPDF_Stream* pStream = pObj->AsStream()) {
     CPDF_Dictionary* pDict = pStream->GetDict();
     if (!pDict)
-      return std::unique_ptr<CPDF_ColorSpace>();
+      return nullptr;
 
     for (const auto& it : *pDict) {
       std::unique_ptr<CPDF_ColorSpace> pRet;
@@ -351,16 +351,16 @@ std::unique_ptr<CPDF_ColorSpace> CPDF_ColorSpace::Load(CPDF_Document* pDoc,
       if (pRet)
         return pRet;
     }
-    return std::unique_ptr<CPDF_ColorSpace>();
+    return nullptr;
   }
 
   CPDF_Array* pArray = pObj->AsArray();
   if (!pArray || pArray->IsEmpty())
-    return std::unique_ptr<CPDF_ColorSpace>();
+    return nullptr;
 
   CPDF_Object* pFamilyObj = pArray->GetDirectObjectAt(0);
   if (!pFamilyObj)
-    return std::unique_ptr<CPDF_ColorSpace>();
+    return nullptr;
 
   CFX_ByteString familyname = pFamilyObj->GetString();
   if (pArray->GetCount() == 1)
@@ -386,11 +386,11 @@ std::unique_ptr<CPDF_ColorSpace> CPDF_ColorSpace::Load(CPDF_Document* pDoc,
   } else if (id == FXBSTR_ID('P', 'a', 't', 't')) {
     pCS.reset(new CPDF_PatternCS(pDoc));
   } else {
-    return std::unique_ptr<CPDF_ColorSpace>();
+    return nullptr;
   }
   pCS->m_pArray = pArray;
   if (!pCS->v_Load(pDoc, pArray))
-    return std::unique_ptr<CPDF_ColorSpace>();
+    return nullptr;
 
   return pCS;
 }
diff --git a/core/fpdfapi/page/fpdf_page_func.cpp b/core/fpdfapi/page/fpdf_page_func.cpp
index a2e31f94bb..df658844cd 100644
--- a/core/fpdfapi/page/fpdf_page_func.cpp
+++ b/core/fpdfapi/page/fpdf_page_func.cpp
@@ -751,7 +751,8 @@ std::unique_ptr<CPDF_Function> CPDF_Function::Load(CPDF_Object* pFuncObj) {
     pFunc.reset(new CPDF_PSFunc());
 
   if (!pFunc || !pFunc->Init(pFuncObj))
-    return std::unique_ptr<CPDF_Function>();
+    return nullptr;
+
   return pFunc;
 }
 
diff --git a/core/fpdfapi/render/fpdf_render_pattern.cpp b/core/fpdfapi/render/fpdf_render_pattern.cpp
index f55a0e8b97..5238550bf5 100644
--- a/core/fpdfapi/render/fpdf_render_pattern.cpp
+++ b/core/fpdfapi/render/fpdf_render_pattern.cpp
@@ -819,7 +819,7 @@ std::unique_ptr<CFX_DIBitmap> DrawPatternBitmap(
   std::unique_ptr<CFX_DIBitmap> pBitmap(new CFX_DIBitmap);
   if (!pBitmap->Create(width, height,
                        pPattern->colored() ? FXDIB_Argb : FXDIB_8bppMask)) {
-    return std::unique_ptr<CFX_DIBitmap>();
+    return nullptr;
   }
   CFX_FxgeDevice bitmap_device;
   bitmap_device.Attach(pBitmap.get(), false, nullptr, false);