diff --git a/src/ccutil/ambigs.cpp b/src/ccutil/ambigs.cpp
index 34d68968..5aafedb1 100644
--- a/src/ccutil/ambigs.cpp
+++ b/src/ccutil/ambigs.cpp
@@ -39,12 +39,9 @@ static const char kIllegalUnicharMsg[] = "Illegal unichar %s in ambiguity specif
 //   UNICHAR_LEN * (MAX_AMBIG_SIZE + 1) for each part of the ambig
 const int kMaxAmbigStringSize = UNICHAR_LEN * (MAX_AMBIG_SIZE + 1);
 
-AmbigSpec::AmbigSpec() {
+AmbigSpec::AmbigSpec() : correct_ngram_id(INVALID_UNICHAR_ID), type(NOT_AMBIG), wrong_ngram_size(0) {
   wrong_ngram[0] = INVALID_UNICHAR_ID;
   correct_fragments[0] = INVALID_UNICHAR_ID;
-  correct_ngram_id = INVALID_UNICHAR_ID;
-  type = NOT_AMBIG;
-  wrong_ngram_size = 0;
 }
 
 // Initializes the ambigs by adding a nullptr pointer to each table.
diff --git a/src/classify/adaptive.cpp b/src/classify/adaptive.cpp
index 3139cce9..1b7bf5fb 100644
--- a/src/classify/adaptive.cpp
+++ b/src/classify/adaptive.cpp
@@ -59,13 +59,12 @@ PERM_CONFIG_STRUCT::~PERM_CONFIG_STRUCT() {
   delete[] Ambigs;
 }
 
-ADAPT_CLASS_STRUCT::ADAPT_CLASS_STRUCT() {
-  NumPermConfigs = 0;
-  MaxNumTimesSeen = 0;
-  TempProtos = NIL_LIST;
-
-  PermProtos = NewBitVector(MAX_NUM_PROTOS);
-  PermConfigs = NewBitVector(MAX_NUM_CONFIGS);
+ADAPT_CLASS_STRUCT::ADAPT_CLASS_STRUCT() :
+  NumPermConfigs(0),
+  MaxNumTimesSeen(0),
+  PermProtos(NewBitVector(MAX_NUM_PROTOS)),
+  PermConfigs(NewBitVector(MAX_NUM_CONFIGS)),
+  TempProtos(NIL_LIST) {
   zero_all_bits(PermProtos, WordsInVectorOfSize(MAX_NUM_PROTOS));
   zero_all_bits(PermConfigs, WordsInVectorOfSize(MAX_NUM_CONFIGS));
 
@@ -124,16 +123,13 @@ int Classify::GetFontinfoId(ADAPT_CLASS_STRUCT *Class, uint8_t ConfigId) {
 ///
 /// @param MaxProtoId  max id of any proto in new config
 /// @param FontinfoId font information from pre-trained templates
-TEMP_CONFIG_STRUCT::TEMP_CONFIG_STRUCT(int maxProtoId, int fontinfoId) {
-  int NumProtos = maxProtoId + 1;
-
-  Protos = NewBitVector(NumProtos);
-
-  NumTimesSeen = 1;
-  MaxProtoId = maxProtoId;
-  ProtoVectorSize = WordsInVectorOfSize(NumProtos);
+TEMP_CONFIG_STRUCT::TEMP_CONFIG_STRUCT(int maxProtoId, int fontinfoId) :
+  NumTimesSeen(1),
+  ProtoVectorSize(WordsInVectorOfSize(maxProtoId + 1)),
+  MaxProtoId(maxProtoId),
+  Protos(NewBitVector(maxProtoId + 1)),
+  FontinfoId(fontinfoId) {
   zero_all_bits(Protos, ProtoVectorSize);
-  FontinfoId = fontinfoId;
 }
 
 TEMP_CONFIG_STRUCT::~TEMP_CONFIG_STRUCT() {
diff --git a/src/tesseract.cpp b/src/tesseract.cpp
index 1ed7fcf3..ac42d2ec 100644
--- a/src/tesseract.cpp
+++ b/src/tesseract.cpp
@@ -78,8 +78,8 @@ static void Win32WarningHandler(const char *module, const char *fmt, va_list ap)
 
 class AutoWin32ConsoleOutputCP {
 public:
-  explicit AutoWin32ConsoleOutputCP(UINT codeCP) {
-    oldCP_ = GetConsoleOutputCP();
+  explicit AutoWin32ConsoleOutputCP(UINT codeCP) :
+    oldCP_(GetConsoleOutputCP()) {
     SetConsoleOutputCP(codeCP);
   }
   ~AutoWin32ConsoleOutputCP() {
diff --git a/src/textord/devanagari_processing.cpp b/src/textord/devanagari_processing.cpp
index bad6edb5..13da1374 100644
--- a/src/textord/devanagari_processing.cpp
+++ b/src/textord/devanagari_processing.cpp
@@ -38,15 +38,16 @@ INT_VAR(devanagari_split_debuglevel, 0, "Debug level for split shiro-rekha proce
 BOOL_VAR(devanagari_split_debugimage, 0,
          "Whether to create a debug image for split shiro-rekha process.");
 
-ShiroRekhaSplitter::ShiroRekhaSplitter() {
-  orig_pix_ = nullptr;
-  segmentation_block_list_ = nullptr;
-  splitted_image_ = nullptr;
-  global_xheight_ = kUnspecifiedXheight;
-  perform_close_ = false;
-  debug_image_ = nullptr;
-  pageseg_split_strategy_ = NO_SPLIT;
-  ocr_split_strategy_ = NO_SPLIT;
+ShiroRekhaSplitter::ShiroRekhaSplitter() :
+  orig_pix_(nullptr),
+  splitted_image_(nullptr),
+  pageseg_split_strategy_(NO_SPLIT),
+  ocr_split_strategy_(NO_SPLIT),
+  debug_image_(nullptr),
+  segmentation_block_list_(nullptr),
+  global_xheight_(kUnspecifiedXheight),
+  perform_close_(false)
+{
 }
 
 ShiroRekhaSplitter::~ShiroRekhaSplitter() {
diff --git a/src/textord/tabfind.cpp b/src/textord/tabfind.cpp
index f6ba2b84..fb6d99ae 100644
--- a/src/textord/tabfind.cpp
+++ b/src/textord/tabfind.cpp
@@ -67,8 +67,8 @@ TabFind::TabFind(int gridsize, const ICOORD &bleft, const ICOORD &tright, TabVec
     : AlignedBlob(gridsize, bleft, tright)
     , resolution_(resolution)
     , image_origin_(0, tright.y() - 1)
-    , v_it_(&vectors_) {
-  width_cb_ = nullptr;
+    , v_it_(&vectors_)
+    , width_cb_(nullptr) {
   v_it_.add_list_after(vlines);
   SetVerticalSkewAndParallelize(vertical_x, vertical_y);
   using namespace std::placeholders; // for _1
diff --git a/src/wordrec/wordrec.cpp b/src/wordrec/wordrec.cpp
index ceaad044..be659068 100644
--- a/src/wordrec/wordrec.cpp
+++ b/src/wordrec/wordrec.cpp
@@ -99,10 +99,10 @@ Wordrec::Wordrec()
                   "Save alternative paths found during chopping"
                   " and segmentation search",
                   params())
-    , pass2_ok_split(0.0f) {
-  prev_word_best_choice_ = nullptr;
-  language_model_ = std::make_unique<LanguageModel>(&get_fontinfo_table(), &(getDict()));
-  fill_lattice_ = nullptr;
+    , language_model_(std::make_unique<LanguageModel>(&get_fontinfo_table(), &(getDict())))
+    , pass2_ok_split(0.0f)
+    , prev_word_best_choice_(nullptr)
+    , fill_lattice_(nullptr) {
 }
 
 } // namespace tesseract
diff --git a/unittest/mastertrainer_test.cc b/unittest/mastertrainer_test.cc
index b6dcc5bb..30f4bf4e 100644
--- a/unittest/mastertrainer_test.cc
+++ b/unittest/mastertrainer_test.cc
@@ -156,9 +156,9 @@ protected:
     return file::JoinPath(FLAGS_test_tmpdir, name);
   }
 
-  MasterTrainerTest() {
-    shape_table_ = nullptr;
-    master_trainer_ = nullptr;
+  MasterTrainerTest() :
+    shape_table_(nullptr),
+    master_trainer_(nullptr) {
   }
   ~MasterTrainerTest() override {
     delete shape_table_;