diff --git a/include/internal/catch_approx.hpp b/include/internal/catch_approx.hpp
index 406c7ef1..66576428 100644
--- a/include/internal/catch_approx.hpp
+++ b/include/internal/catch_approx.hpp
@@ -27,12 +27,7 @@ namespace Detail {
             m_value( value )
         {}
 
-        Approx( Approx const& other )
-        :   m_epsilon( other.m_epsilon ),
-            m_margin( other.m_margin ),
-            m_scale( other.m_scale ),
-            m_value( other.m_value )
-        {}
+        Approx( Approx const& other ) = default;
 
         static Approx custom() {
             return Approx( 0 );
diff --git a/include/internal/catch_assertionresult.h b/include/internal/catch_assertionresult.h
index c729e8d0..24ab4f62 100644
--- a/include/internal/catch_assertionresult.h
+++ b/include/internal/catch_assertionresult.h
@@ -53,11 +53,6 @@ namespace Catch {
 
     struct AssertionResultData
     {
-        AssertionResultData() : decomposedExpression( nullptr )
-                              , resultType( ResultWas::Unknown )
-                              , negated( false )
-                              , parenthesized( false ) {}
-
         void negate( bool parenthesize ) {
             negated = !negated;
             parenthesized = parenthesize;
@@ -82,12 +77,12 @@ namespace Catch {
             return reconstructedExpression;
         }
 
-        mutable DecomposedExpression const* decomposedExpression;
+        mutable DecomposedExpression const* decomposedExpression = nullptr;
         mutable std::string reconstructedExpression;
         std::string message;
-        ResultWas::OfType resultType;
-        bool negated;
-        bool parenthesized;
+        ResultWas::OfType resultType = ResultWas::Unknown;
+        bool negated = false;
+        bool parenthesized = false;
     };
 
     class AssertionResult {
diff --git a/include/internal/catch_config.hpp b/include/internal/catch_config.hpp
index 64141e7f..24afda6e 100644
--- a/include/internal/catch_config.hpp
+++ b/include/internal/catch_config.hpp
@@ -25,47 +25,26 @@
 namespace Catch {
 
     struct ConfigData {
+        bool listTests = false;
+        bool listTags = false;
+        bool listReporters = false;
+        bool listTestNamesOnly = false;
 
-        ConfigData()
-        :   listTests( false ),
-            listTags( false ),
-            listReporters( false ),
-            listTestNamesOnly( false ),
-            showSuccessfulTests( false ),
-            shouldDebugBreak( false ),
-            noThrow( false ),
-            showHelp( false ),
-            showInvisibles( false ),
-            filenamesAsTags( false ),
-            abortAfter( -1 ),
-            rngSeed( 0 ),
-            verbosity( Verbosity::Normal ),
-            warnings( WarnAbout::Nothing ),
-            showDurations( ShowDurations::DefaultForReporter ),
-            runOrder( RunTests::InDeclarationOrder ),
-            useColour( UseColour::Auto )
-        {}
+        bool showSuccessfulTests = false;
+        bool shouldDebugBreak = false;
+        bool noThrow = false;
+        bool showHelp = false;
+        bool showInvisibles = false;
+        bool filenamesAsTags = false;
 
-        bool listTests;
-        bool listTags;
-        bool listReporters;
-        bool listTestNamesOnly;
+        int abortAfter = -1;
+        unsigned int rngSeed = 0;
 
-        bool showSuccessfulTests;
-        bool shouldDebugBreak;
-        bool noThrow;
-        bool showHelp;
-        bool showInvisibles;
-        bool filenamesAsTags;
-
-        int abortAfter;
-        unsigned int rngSeed;
-
-        Verbosity::Level verbosity;
-        WarnAbout::What warnings;
-        ShowDurations::OrNot showDurations;
-        RunTests::InWhatOrder runOrder;
-        UseColour::YesOrNo useColour;
+        Verbosity::Level verbosity = Verbosity::Normal;
+        WarnAbout::What warnings = WarnAbout::Nothing;
+        ShowDurations::OrNot showDurations = ShowDurations::DefaultForReporter;
+        RunTests::InWhatOrder runOrder = RunTests::InDeclarationOrder;
+        UseColour::YesOrNo useColour = UseColour::Auto;
 
         std::string outputFilename;
         std::string name;
diff --git a/include/internal/catch_context_impl.hpp b/include/internal/catch_context_impl.hpp
index 84f1ca1c..b9488c6e 100644
--- a/include/internal/catch_context_impl.hpp
+++ b/include/internal/catch_context_impl.hpp
@@ -16,11 +16,7 @@
 
 namespace Catch {
 
-    class Context : public IMutableContext {
-
-        Context() : m_config( nullptr ), m_runner( nullptr ), m_resultCapture( nullptr ) {}
-        Context( Context const& );
-        void operator=( Context const& );
+    class Context : public IMutableContext, NonCopyable {
 
     public:
         virtual ~Context() {
@@ -84,8 +80,8 @@ namespace Catch {
 
     private:
         Ptr<IConfig const> m_config;
-        IRunner* m_runner;
-        IResultCapture* m_resultCapture;
+        IRunner* m_runner = nullptr;
+        IResultCapture* m_resultCapture = nullptr;
         std::map<std::string, IGeneratorsForTest*> m_generatorsByTestName;
     };
 
diff --git a/include/internal/catch_expression_lhs.hpp b/include/internal/catch_expression_lhs.hpp
index 8cf41409..756a07f6 100644
--- a/include/internal/catch_expression_lhs.hpp
+++ b/include/internal/catch_expression_lhs.hpp
@@ -25,7 +25,7 @@ class MatchExpression;
 template<typename T>
 class ExpressionLhs : public DecomposedExpression {
 public:
-    ExpressionLhs( ResultBuilder& rb, T lhs ) : m_rb( rb ), m_lhs( lhs ), m_truthy(false) {}
+    ExpressionLhs( ResultBuilder& rb, T lhs ) : m_rb( rb ), m_lhs( lhs ) {}
 
     ExpressionLhs& operator = ( const ExpressionLhs& );
 
@@ -98,7 +98,7 @@ private:
 private:
     ResultBuilder& m_rb;
     T m_lhs;
-    bool m_truthy;
+    bool m_truthy = false;
 };
 
 template<typename LhsT, Internal::Operator Op, typename RhsT>
diff --git a/include/internal/catch_list.hpp b/include/internal/catch_list.hpp
index fc1cc91a..f90767d1 100644
--- a/include/internal/catch_list.hpp
+++ b/include/internal/catch_list.hpp
@@ -71,7 +71,6 @@ namespace Catch {
     }
 
     struct TagInfo {
-        TagInfo() : count ( 0 ) {}
         void add( std::string const& spelling ) {
             ++count;
             spellings.insert( spelling );
@@ -83,7 +82,7 @@ namespace Catch {
             return out;
         }
         std::set<std::string> spellings;
-        std::size_t count;
+        std::size_t count = 0;
     };
 
     inline std::size_t listTags( Config const& config ) {
diff --git a/include/internal/catch_result_builder.h b/include/internal/catch_result_builder.h
index a2cf596d..65483198 100644
--- a/include/internal/catch_result_builder.h
+++ b/include/internal/catch_result_builder.h
@@ -20,7 +20,7 @@ namespace Catch {
     template<typename T> class ExpressionLhs;
 
     struct CopyableStream {
-        CopyableStream() {}
+        CopyableStream() = default;
         CopyableStream( CopyableStream const& other ) {
             oss << other.oss.str();
         }
@@ -82,9 +82,9 @@ namespace Catch {
         AssertionResultData m_data;
         CopyableStream m_stream;
 
-        bool m_shouldDebugBreak;
-        bool m_shouldThrow;
-        bool m_guardException;
+        bool m_shouldDebugBreak = false;
+        bool m_shouldThrow = false;
+        bool m_guardException = false;
     };
 
 } // namespace Catch
diff --git a/include/internal/catch_result_builder.hpp b/include/internal/catch_result_builder.hpp
index 2874c568..4eea95fe 100644
--- a/include/internal/catch_result_builder.hpp
+++ b/include/internal/catch_result_builder.hpp
@@ -28,10 +28,7 @@ namespace Catch {
                                     char const* capturedExpression,
                                     ResultDisposition::Flags resultDisposition,
                                     char const* secondArg )
-    :   m_assertionInfo( macroName, lineInfo, capturedExpressionWithSecondArgument( capturedExpression, secondArg ), resultDisposition ),
-        m_shouldDebugBreak( false ),
-        m_shouldThrow( false ),
-        m_guardException( false )
+    :   m_assertionInfo( macroName, lineInfo, capturedExpressionWithSecondArgument( capturedExpression, secondArg ), resultDisposition )
     {}
 
     ResultBuilder::~ResultBuilder() {
diff --git a/include/internal/catch_run_context.hpp b/include/internal/catch_run_context.hpp
index 12435cdc..23c4654a 100644
--- a/include/internal/catch_run_context.hpp
+++ b/include/internal/catch_run_context.hpp
@@ -62,10 +62,8 @@ namespace Catch {
         explicit RunContext( Ptr<IConfig const> const& _config, Ptr<IStreamingReporter> const& reporter )
         :   m_runInfo( _config->name() ),
             m_context( getCurrentMutableContext() ),
-            m_activeTestCase( nullptr ),
             m_config( _config ),
-            m_reporter( reporter ),
-            m_shouldReportUnexpected ( true )
+            m_reporter( reporter )
         {
             m_context.setRunner( this );
             m_context.setConfig( m_config );
@@ -350,7 +348,7 @@ namespace Catch {
 
         TestRunInfo m_runInfo;
         IMutableContext& m_context;
-        TestCase const* m_activeTestCase;
+        TestCase const* m_activeTestCase = nullptr;
         ITracker* m_testCaseTracker;
         ITracker* m_currentSectionTracker;
         AssertionResult m_lastResult;
@@ -363,7 +361,7 @@ namespace Catch {
         std::vector<SectionEndInfo> m_unfinishedSections;
         std::vector<ITracker*> m_activeSections;
         TrackerContext m_trackerContext;
-        bool m_shouldReportUnexpected;
+        bool m_shouldReportUnexpected = true;
     };
 
     IResultCapture& getResultCapture() {
diff --git a/include/internal/catch_section.h b/include/internal/catch_section.h
index 2667b74e..e3b14564 100644
--- a/include/internal/catch_section.h
+++ b/include/internal/catch_section.h
@@ -22,7 +22,7 @@ namespace Catch {
         ~Section();
 
         // This indicates whether the section should be executed or not
-        operator bool() const;
+        explicit operator bool() const;
 
     private:
         SectionInfo m_info;
diff --git a/include/internal/catch_suppress_warnings.h b/include/internal/catch_suppress_warnings.h
index ad405922..65ed6a62 100644
--- a/include/internal/catch_suppress_warnings.h
+++ b/include/internal/catch_suppress_warnings.h
@@ -16,8 +16,6 @@
 #       pragma clang diagnostic ignored "-Wunused-variable"
 #       pragma clang diagnostic push
 #       pragma clang diagnostic ignored "-Wpadded"
-#       pragma clang diagnostic ignored "-Wc++98-compat"
-#       pragma clang diagnostic ignored "-Wc++98-compat-pedantic"
 #       pragma clang diagnostic ignored "-Wswitch-enum"
 #       pragma clang diagnostic ignored "-Wcovered-switch-default"
 #    endif
diff --git a/include/internal/catch_test_case_registry_impl.hpp b/include/internal/catch_test_case_registry_impl.hpp
index 5900d6f0..e5b1f281 100644
--- a/include/internal/catch_test_case_registry_impl.hpp
+++ b/include/internal/catch_test_case_registry_impl.hpp
@@ -91,10 +91,6 @@ namespace Catch {
 
     class TestRegistry : public ITestCaseRegistry {
     public:
-        TestRegistry()
-        :   m_currentSortOrder( RunTests::InDeclarationOrder ),
-            m_unnamedCount( 0 )
-        {}
         virtual ~TestRegistry();
 
         virtual void registerTest( TestCase const& testCase ) {
@@ -123,9 +119,9 @@ namespace Catch {
 
     private:
         std::vector<TestCase> m_functions;
-        mutable RunTests::InWhatOrder m_currentSortOrder;
+        mutable RunTests::InWhatOrder m_currentSortOrder = RunTests::InDeclarationOrder;
         mutable std::vector<TestCase> m_sortedFunctions;
-        size_t m_unnamedCount;
+        size_t m_unnamedCount = 0;
         std::ios_base::Init m_ostreamInit; // Forces cout/ cerr to be initialised
     };
 
diff --git a/include/internal/catch_test_case_tracker.hpp b/include/internal/catch_test_case_tracker.hpp
index 6654734f..6da8ff53 100644
--- a/include/internal/catch_test_case_tracker.hpp
+++ b/include/internal/catch_test_case_tracker.hpp
@@ -69,8 +69,8 @@ namespace TestCaseTracking {
         };
 
         Ptr<ITracker> m_rootTracker;
-        ITracker* m_currentTracker;
-        RunState m_runState;
+        ITracker* m_currentTracker = nullptr;
+        RunState m_runState = NotStarted;
 
     public:
 
@@ -79,12 +79,6 @@ namespace TestCaseTracking {
             return s_instance;
         }
 
-        TrackerContext()
-        :   m_currentTracker( nullptr ),
-            m_runState( NotStarted )
-        {}
-
-
         ITracker& startRun();
 
         void endRun() {
@@ -137,13 +131,12 @@ namespace TestCaseTracking {
         TrackerContext& m_ctx;
         ITracker* m_parent;
         Children m_children;
-        CycleState m_runState;
+        CycleState m_runState = NotStarted;
     public:
         TrackerBase( NameAndLocation const& nameAndLocation, TrackerContext& ctx, ITracker* parent )
         :   m_nameAndLocation( nameAndLocation ),
             m_ctx( ctx ),
-            m_parent( parent ),
-            m_runState( NotStarted )
+            m_parent( parent )
         {}
         virtual ~TrackerBase();
 
@@ -302,12 +295,11 @@ namespace TestCaseTracking {
 
     class IndexTracker : public TrackerBase {
         int m_size;
-        int m_index;
+        int m_index = -1;
     public:
         IndexTracker( NameAndLocation const& nameAndLocation, TrackerContext& ctx, ITracker* parent, int size )
         :   TrackerBase( nameAndLocation, ctx, parent ),
-            m_size( size ),
-            m_index( -1 )
+            m_size( size )
         {}
         virtual ~IndexTracker();
 
diff --git a/include/internal/catch_timer.h b/include/internal/catch_timer.h
index 81b9fdb7..60115c80 100644
--- a/include/internal/catch_timer.h
+++ b/include/internal/catch_timer.h
@@ -13,14 +13,13 @@
 namespace Catch {
     class Timer {
     public:
-        Timer() : m_microSeconds( 0 ) {}
         void start();
         unsigned int getElapsedMicroseconds() const;
         unsigned int getElapsedMilliseconds() const;
         double getElapsedSeconds() const;
 
     private:
-        uint64_t m_microSeconds;
+        uint64_t m_microSeconds = 0;
     };
 
 } // namespace Catch
diff --git a/include/internal/catch_totals.hpp b/include/internal/catch_totals.hpp
index 551e2947..8c26263c 100644
--- a/include/internal/catch_totals.hpp
+++ b/include/internal/catch_totals.hpp
@@ -13,8 +13,6 @@
 namespace Catch {
 
     struct Counts {
-        Counts() : passed( 0 ), failed( 0 ), failedButOk( 0 ) {}
-
         Counts operator - ( Counts const& other ) const {
             Counts diff;
             diff.passed = passed - other.passed;
@@ -39,9 +37,9 @@ namespace Catch {
             return failed == 0;
         }
 
-        std::size_t passed;
-        std::size_t failed;
-        std::size_t failedButOk;
+        std::size_t passed = 0;
+        std::size_t failed = 0;
+        std::size_t failedButOk = 0;
     };
 
     struct Totals {
diff --git a/include/internal/catch_wildcard_pattern.hpp b/include/internal/catch_wildcard_pattern.hpp
index a922912d..b9827b96 100644
--- a/include/internal/catch_wildcard_pattern.hpp
+++ b/include/internal/catch_wildcard_pattern.hpp
@@ -27,7 +27,6 @@ namespace Catch
 
         WildcardPattern( std::string const& pattern, CaseSensitive::Choice caseSensitivity )
         :   m_caseSensitivity( caseSensitivity ),
-            m_wildcard( NoWildcard ),
             m_pattern( adjustCase( pattern ) )
         {
             if( startsWith( m_pattern, '*' ) ) {
@@ -66,7 +65,7 @@ namespace Catch
             return m_caseSensitivity == CaseSensitive::No ? toLower( str ) : str;
         }
         CaseSensitive::Choice m_caseSensitivity;
-        WildcardPosition m_wildcard;
+        WildcardPosition m_wildcard = NoWildcard;
         std::string m_pattern;
     };
 }
diff --git a/include/internal/catch_xmlwriter.hpp b/include/internal/catch_xmlwriter.hpp
index b39a2fd7..0b951c71 100644
--- a/include/internal/catch_xmlwriter.hpp
+++ b/include/internal/catch_xmlwriter.hpp
@@ -112,18 +112,7 @@ namespace Catch {
             mutable XmlWriter* m_writer;
         };
 
-        XmlWriter()
-        :   m_tagIsOpen( false ),
-            m_needsNewline( false ),
-            m_os( Catch::cout() )
-        {
-            writeDeclaration();
-        }
-
-        XmlWriter( std::ostream& os )
-        :   m_tagIsOpen( false ),
-            m_needsNewline( false ),
-            m_os( os )
+        XmlWriter( std::ostream& os = Catch::cout() ) : m_os( os )
         {
             writeDeclaration();
         }
@@ -233,8 +222,8 @@ namespace Catch {
             }
         }
 
-        bool m_tagIsOpen;
-        bool m_needsNewline;
+        bool m_tagIsOpen = false;
+        bool m_needsNewline = false;
         std::vector<std::string> m_tags;
         std::string m_indent;
         std::ostream& m_os;
diff --git a/include/reporters/catch_reporter_compact.hpp b/include/reporters/catch_reporter_compact.hpp
index 3987d37c..1579a608 100644
--- a/include/reporters/catch_reporter_compact.hpp
+++ b/include/reporters/catch_reporter_compact.hpp
@@ -17,9 +17,7 @@ namespace Catch {
 
     struct CompactReporter : StreamingReporterBase {
 
-        CompactReporter( ReporterConfig const& _config )
-        : StreamingReporterBase( _config )
-        {}
+        using StreamingReporterBase::StreamingReporterBase;
 
         virtual ~CompactReporter();
 
diff --git a/include/reporters/catch_reporter_console.hpp b/include/reporters/catch_reporter_console.hpp
index 29951fcf..bbe38a87 100644
--- a/include/reporters/catch_reporter_console.hpp
+++ b/include/reporters/catch_reporter_console.hpp
@@ -20,10 +20,7 @@ namespace Catch {
 
 
     struct ConsoleReporter : StreamingReporterBase {
-        ConsoleReporter( ReporterConfig const& _config )
-        :   StreamingReporterBase( _config ),
-            m_headerPrinted( false )
-        {}
+        using StreamingReporterBase::StreamingReporterBase;
 
         virtual ~ConsoleReporter() override;
         static std::string getDescription() {
@@ -435,7 +432,7 @@ namespace Catch {
         }
 
     private:
-        bool m_headerPrinted;
+        bool m_headerPrinted = false;
     };
 
     INTERNAL_CATCH_REGISTER_REPORTER( "console", ConsoleReporter )
diff --git a/include/reporters/catch_reporter_junit.hpp b/include/reporters/catch_reporter_junit.hpp
index acc5664c..f5cbc47d 100644
--- a/include/reporters/catch_reporter_junit.hpp
+++ b/include/reporters/catch_reporter_junit.hpp
@@ -51,8 +51,7 @@ namespace Catch {
     public:
         JunitReporter( ReporterConfig const& _config )
         :   CumulativeReporterBase( _config ),
-            xml( _config.stream() ),
-            m_okToFail( false )
+            xml( _config.stream() )
         {
             m_reporterPrefs.shouldRedirectStdOut = true;
         }
@@ -233,7 +232,7 @@ namespace Catch {
         std::ostringstream stdOutForSuite;
         std::ostringstream stdErrForSuite;
         unsigned int unexpectedExceptions;
-        bool m_okToFail;
+        bool m_okToFail = false;
     };
 
     INTERNAL_CATCH_REGISTER_REPORTER( "junit", JunitReporter )
diff --git a/include/reporters/catch_reporter_tap.hpp b/include/reporters/catch_reporter_tap.hpp
index 8f8896a6..b34acac3 100644
--- a/include/reporters/catch_reporter_tap.hpp
+++ b/include/reporters/catch_reporter_tap.hpp
@@ -21,10 +21,7 @@ namespace Catch {
 
     struct TAPReporter : StreamingReporterBase {
 
-        TAPReporter( ReporterConfig const& _config )
-        : StreamingReporterBase( _config ),
-          counter(0)
-        {}
+        using StreamingReporterBase::StreamingReporterBase;
 
         virtual ~TAPReporter();
 
@@ -62,7 +59,7 @@ namespace Catch {
         }
 
     private:
-        size_t counter;
+        size_t counter = 0;
         class AssertionPrinter {
             void operator= ( AssertionPrinter const& );
         public:
diff --git a/include/reporters/catch_reporter_teamcity.hpp b/include/reporters/catch_reporter_teamcity.hpp
index ae2efd88..79f40f92 100644
--- a/include/reporters/catch_reporter_teamcity.hpp
+++ b/include/reporters/catch_reporter_teamcity.hpp
@@ -25,8 +25,7 @@ namespace Catch {
 
     struct TeamCityReporter : StreamingReporterBase {
         TeamCityReporter( ReporterConfig const& _config )
-        :   StreamingReporterBase( _config ),
-            m_headerPrintedForThisSection( false )
+        :   StreamingReporterBase( _config )
         {
             m_reporterPrefs.shouldRedirectStdOut = true;
         }
@@ -198,7 +197,7 @@ namespace Catch {
                            .setInitialIndent( indent ) ) << "\n";
         }
     private:
-        bool m_headerPrintedForThisSection;
+        bool m_headerPrintedForThisSection = false;
     };
 
 #ifdef CATCH_IMPL
diff --git a/include/reporters/catch_reporter_xml.hpp b/include/reporters/catch_reporter_xml.hpp
index cf26834f..b99ec11f 100644
--- a/include/reporters/catch_reporter_xml.hpp
+++ b/include/reporters/catch_reporter_xml.hpp
@@ -20,8 +20,7 @@ namespace Catch {
     public:
         XmlReporter( ReporterConfig const& _config )
         :   StreamingReporterBase( _config ),
-            m_xml(_config.stream()),
-            m_sectionDepth( 0 )
+            m_xml(_config.stream())
         {
             m_reporterPrefs.shouldRedirectStdOut = true;
         }
@@ -219,7 +218,7 @@ namespace Catch {
     private:
         Timer m_testCaseTimer;
         XmlWriter m_xml;
-        int m_sectionDepth;
+        int m_sectionDepth = 0;
     };
 
      INTERNAL_CATCH_REGISTER_REPORTER( "xml", XmlReporter )