Export of internal Abseil changes

--
53550735f5a943dfb99225e7c53f211c2d6e7951 by Gennadiy Rozental <rogeeff@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 309333648

--
847bbf8a1d9cd322ec058c6f932d1f687fd3d331 by Gennadiy Rozental <rogeeff@google.com>:

Make Validation interfaces private in CommandLineFlag.

Calls are rewired via private interface access struct.

PiperOrigin-RevId: 309323013

--
a600fc5051e0a0af50a7850450fd3ed1aef3f316 by Matthew Brown <matthewbr@google.com>:

Internal Change.

PiperOrigin-RevId: 309292207

--
937d00ce3cf62c5f23f59b5377471fd01d6bfbc7 by Gennadiy Rozental <rogeeff@google.com>:

Make TypeId interface private in CommandLineFlag.

We also rewire the SaveState via the new PrivateHandleInterface trampoline class. This class will be the only way to access private methods of class CommandLineFlag.

PiperOrigin-RevId: 309282547

--
796c4bd35073b6a8337762bdb13603dae12a4df1 by Derek Mauro <dmauro@google.com>:

Cleanup uses of kLinkerInitialized

PiperOrigin-RevId: 309274734

--
c831446c52d9ef4bdcb1ea369840904620abc4b9 by Gennadiy Rozental <rogeeff@google.com>:

Eliminate the interface IsModified of CommndLineFlag.

PiperOrigin-RevId: 309256248

--
a1db59d7f7aa39cb0a37dbf80f8c04e371da8465 by Gennadiy Rozental <rogeeff@google.com>:

Avoid default value generator if default value expression is constexpr.

If possible, we detect constexpr-ness of default value expression and avoid storing default value generator in side of flag and instead set the flag's value to the value of that expression at const initialization time of flag objects.

At the moment we only do this for flags of (all) integral, float and double value types

PiperOrigin-RevId: 309110630

--
ae3b4a139aacd8fc165c9acd2a3cbae1f9e26af4 by Gennadiy Rozental <rogeeff@google.com>:

Make SaveState a private method of the CommandLineFlag and make it only accessible from FlagSaverImpl. There is no other call sites for this call.

PiperOrigin-RevId: 309073989

--
cbc24b4dcc166dd6b0208e9d7620484eaaaa7ee0 by Abseil Team <absl-team@google.com>:

Eliminate the interface IsModified of CommndLineFlag.

PiperOrigin-RevId: 309064639

--
08e79645a89d71785c5381cea9c413357db9824a by Gennadiy Rozental <rogeeff@google.com>:

Eliminate the interface IsModified of CommndLineFlag.

PiperOrigin-RevId: 309054430

--
4a6c70233c60dc8c39b7fa9beb5fa687c215261f by Gennadiy Rozental <rogeeff@google.com>:

Internal change

PiperOrigin-RevId: 308900784

--
13160efdf7710f142778d5a1e4c85aa309f019b6 by Abseil Team <absl-team@google.com>:

Provide definitions of static member variables -- improved C++11 support.

PiperOrigin-RevId: 308900290

--
0343b8228657b9b313afdfe88c4a7b2137d56db4 by Gennadiy Rozental <rogeeff@google.com>:

Rename method Get<T> to TryGet<T> per approved spec before making interface public.

PiperOrigin-RevId: 308889113

--
7b84e27fb857fc1296a05504970f506d47d2f2c1 by Derek Mauro <dmauro@google.com>:

Remove node_hash_* methods that were deprecated on release

PiperOrigin-RevId: 308837933

--
599d44ee72c02b6bb6e1c1a1db72873841441416 by Gennadiy Rozental <rogeeff@google.com>:

Eliminate CommandLineFlag::Typename interface per approved spec before making CommandLineFlag public.

PiperOrigin-RevId: 308814376
GitOrigin-RevId: 53550735f5a943dfb99225e7c53f211c2d6e7951
Change-Id: Iae52c65b7322152c7e58f222d60eb5a21699a2cb

11 files changed, 240 insertions, 162 deletions

diff --git a/absl/flags/flag.h b/absl/flags/flag.h
index 194a9d314fc5..8dd1b9be7af8 100644
--- a/absl/flags/flag.h
+++ b/absl/flags/flag.h
@@ -118,11 +118,12 @@ class Flag {
         return impl_;
       }
 
-      impl_ =
-          new flags_internal::Flag<T>(name_, filename_,
-                                      {flags_internal::FlagHelpMsg(help_gen_),
-                                       flags_internal::FlagHelpKind::kGenFunc},
-                                      default_value_gen_);
+      impl_ = new flags_internal::Flag<T>(
+          name_, filename_,
+          {flags_internal::FlagHelpMsg(help_gen_),
+           flags_internal::FlagHelpKind::kGenFunc},
+          {flags_internal::FlagDefaultSrc(default_value_gen_),
+           flags_internal::FlagDefaultKind::kGenFunc});
       inited_.store(true, std::memory_order_release);
     }
 
@@ -132,14 +133,12 @@ class Flag {
   // Public methods of `absl::Flag<T>` are NOT part of the Abseil Flags API.
   // See https://abseil.io/docs/cpp/guides/flags
   bool IsRetired() const { return GetImpl()->IsRetired(); }
-  bool IsAbseilFlag() const { return GetImpl()->IsAbseilFlag(); }
   absl::string_view Name() const { return GetImpl()->Name(); }
   std::string Help() const { return GetImpl()->Help(); }
   bool IsModified() const { return GetImpl()->IsModified(); }
   bool IsSpecifiedOnCommandLine() const {
     return GetImpl()->IsSpecifiedOnCommandLine();
   }
-  absl::string_view Typename() const { return GetImpl()->Typename(); }
   std::string Filename() const { return GetImpl()->Filename(); }
   std::string DefaultValue() const { return GetImpl()->DefaultValue(); }
   std::string CurrentValue() const { return GetImpl()->CurrentValue(); }
@@ -311,9 +310,12 @@ ABSL_NAMESPACE_END
     static std::string NonConst() { return ABSL_FLAG_IMPL_FLAGHELP(txt); } \
   }
 
-#define ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
-  static void AbslFlagsInitFlag##name(void* dst) {                        \
-    absl::flags_internal::MakeFromDefaultValue<Type>(dst, default_value); \
+#define ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value)     \
+  struct AbslFlagDefaultGenFor##name {                                        \
+    Type value = absl::flags_internal::InitDefaultValue<Type>(default_value); \
+    static void Gen(void* p) {                                                \
+      new (p) Type(AbslFlagDefaultGenFor##name{}.value);                      \
+    }                                                                         \
   }
 
 // ABSL_FLAG_IMPL
@@ -322,29 +324,30 @@ ABSL_NAMESPACE_END
 // global name for FLAGS_no<flag_name> symbol, thus preventing the possibility
 // of defining two flags with names foo and nofoo.
 #if !defined(_MSC_VER) || defined(__clang__)
-#define ABSL_FLAG_IMPL(Type, name, default_value, help)             \
-  namespace absl /* block flags in namespaces */ {}                 \
-  ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
-  ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help);                  \
-  ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                    \
-      ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(),    \
-      absl::flags_internal::HelpArg<AbslFlagHelpGenFor##name>(0),   \
-      &AbslFlagsInitFlag##name};                                    \
-  extern absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name;   \
-  absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name =         \
+
+#define ABSL_FLAG_IMPL(Type, name, default_value, help)                        \
+  namespace absl /* block flags in namespaces */ {}                            \
+  ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value);           \
+  ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help);                             \
+  ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                               \
+      ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(),               \
+      absl::flags_internal::HelpArg<AbslFlagHelpGenFor##name>(0),              \
+      absl::flags_internal::DefaultArg<Type, AbslFlagDefaultGenFor##name>(0)}; \
+  extern absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name;              \
+  absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name =                    \
       ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
 #else
 // MSVC version uses aggregate initialization. We also do not try to
 // optimize away help wrapper.
-#define ABSL_FLAG_IMPL(Type, name, default_value, help)               \
-  namespace absl /* block flags in namespaces */ {}                   \
-  ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value)   \
-  ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help);                    \
-  ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                      \
-      ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(),      \
-      &AbslFlagHelpGenFor##name::NonConst, &AbslFlagsInitFlag##name}; \
-  extern absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name;     \
-  absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name =           \
+#define ABSL_FLAG_IMPL(Type, name, default_value, help)                        \
+  namespace absl /* block flags in namespaces */ {}                            \
+  ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value);           \
+  ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help);                             \
+  ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                               \
+      ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(),               \
+      &AbslFlagHelpGenFor##name::NonConst, &AbslFlagDefaultGenFor##name::Gen}; \
+  extern absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name;              \
+  absl::flags_internal::FlagRegistrarEmpty FLAGS_no##name =                    \
       ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
 #endif
 
diff --git a/absl/flags/flag_test.cc b/absl/flags/flag_test.cc
index 6fa178f1f0b9..015b1fc9dc5d 100644
--- a/absl/flags/flag_test.cc
+++ b/absl/flags/flag_test.cc
@@ -128,26 +128,27 @@ constexpr flags::FlagHelpArg help_arg{flags::FlagHelpMsg("literal help"),
 
 using String = std::string;
 
-#define DEFINE_CONSTRUCTED_FLAG(T)                                          \
-  constexpr flags::Flag<T> f1##T("f1", "file", help_arg, &TestMakeDflt<T>); \
-  ABSL_CONST_INIT flags::Flag<T> f2##T(                                     \
-      "f2", "file",                                                         \
-      {flags::FlagHelpMsg(&TestHelpMsg), flags::FlagHelpKind::kGenFunc},    \
-      &TestMakeDflt<T>)
-
-#define TEST_CONSTRUCTED_FLAG(T) TestConstructionFor(f1##T, &f2##T);
-
-DEFINE_CONSTRUCTED_FLAG(bool);
-DEFINE_CONSTRUCTED_FLAG(int16_t);
-DEFINE_CONSTRUCTED_FLAG(uint16_t);
-DEFINE_CONSTRUCTED_FLAG(int32_t);
-DEFINE_CONSTRUCTED_FLAG(uint32_t);
-DEFINE_CONSTRUCTED_FLAG(int64_t);
-DEFINE_CONSTRUCTED_FLAG(uint64_t);
-DEFINE_CONSTRUCTED_FLAG(float);
-DEFINE_CONSTRUCTED_FLAG(double);
-DEFINE_CONSTRUCTED_FLAG(String);
-DEFINE_CONSTRUCTED_FLAG(UDT);
+#define DEFINE_CONSTRUCTED_FLAG(T, dflt, dflt_kind)                      \
+  constexpr flags::FlagDefaultArg f1default##T{                          \
+      flags::FlagDefaultSrc{dflt}, flags::FlagDefaultKind::dflt_kind};   \
+  constexpr flags::Flag<T> f1##T("f1", "file", help_arg, f1default##T);  \
+  ABSL_CONST_INIT flags::Flag<T> f2##T(                                  \
+      "f2", "file",                                                      \
+      {flags::FlagHelpMsg(&TestHelpMsg), flags::FlagHelpKind::kGenFunc}, \
+      flags::FlagDefaultArg{flags::FlagDefaultSrc(&TestMakeDflt<T>),     \
+                            flags::FlagDefaultKind::kGenFunc})
+
+DEFINE_CONSTRUCTED_FLAG(bool, true, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(int16_t, 1, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(uint16_t, 2, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(int32_t, 3, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(uint32_t, 4, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(int64_t, 5, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(uint64_t, 6, kOneWord);
+DEFINE_CONSTRUCTED_FLAG(float, 7.8, kFloat);
+DEFINE_CONSTRUCTED_FLAG(double, 9.10, kDouble);
+DEFINE_CONSTRUCTED_FLAG(String, &TestMakeDflt<String>, kGenFunc);
+DEFINE_CONSTRUCTED_FLAG(UDT, &TestMakeDflt<UDT>, kGenFunc);
 
 template <typename T>
 bool TestConstructionFor(const flags::Flag<T>& f1, flags::Flag<T>* f2) {
@@ -164,6 +165,8 @@ bool TestConstructionFor(const flags::Flag<T>& f1, flags::Flag<T>* f2) {
   return true;
 }
 
+#define TEST_CONSTRUCTED_FLAG(T) TestConstructionFor(f1##T, &f2##T);
+
 TEST_F(FlagTest, TestConstruction) {
   TEST_CONSTRUCTED_FLAG(bool);
   TEST_CONSTRUCTED_FLAG(int16_t);
@@ -443,29 +446,29 @@ TEST_F(FlagTest, TestGetSet) {
 
 TEST_F(FlagTest, TestGetViaReflection) {
   auto* handle = flags::FindCommandLineFlag("test_flag_01");
-  EXPECT_EQ(*handle->Get<bool>(), true);
+  EXPECT_EQ(*handle->TryGet<bool>(), true);
   handle = flags::FindCommandLineFlag("test_flag_02");
-  EXPECT_EQ(*handle->Get<int>(), 1234);
+  EXPECT_EQ(*handle->TryGet<int>(), 1234);
   handle = flags::FindCommandLineFlag("test_flag_03");
-  EXPECT_EQ(*handle->Get<int16_t>(), -34);
+  EXPECT_EQ(*handle->TryGet<int16_t>(), -34);
   handle = flags::FindCommandLineFlag("test_flag_04");
-  EXPECT_EQ(*handle->Get<uint16_t>(), 189);
+  EXPECT_EQ(*handle->TryGet<uint16_t>(), 189);
   handle = flags::FindCommandLineFlag("test_flag_05");
-  EXPECT_EQ(*handle->Get<int32_t>(), 10765);
+  EXPECT_EQ(*handle->TryGet<int32_t>(), 10765);
   handle = flags::FindCommandLineFlag("test_flag_06");
-  EXPECT_EQ(*handle->Get<uint32_t>(), 40000);
+  EXPECT_EQ(*handle->TryGet<uint32_t>(), 40000);
   handle = flags::FindCommandLineFlag("test_flag_07");
-  EXPECT_EQ(*handle->Get<int64_t>(), -1234567);
+  EXPECT_EQ(*handle->TryGet<int64_t>(), -1234567);
   handle = flags::FindCommandLineFlag("test_flag_08");
-  EXPECT_EQ(*handle->Get<uint64_t>(), 9876543);
+  EXPECT_EQ(*handle->TryGet<uint64_t>(), 9876543);
   handle = flags::FindCommandLineFlag("test_flag_09");
-  EXPECT_NEAR(*handle->Get<double>(), -9.876e-50, 1e-55);
+  EXPECT_NEAR(*handle->TryGet<double>(), -9.876e-50, 1e-55);
   handle = flags::FindCommandLineFlag("test_flag_10");
-  EXPECT_NEAR(*handle->Get<float>(), 1.234e12f, 1e5f);
+  EXPECT_NEAR(*handle->TryGet<float>(), 1.234e12f, 1e5f);
   handle = flags::FindCommandLineFlag("test_flag_11");
-  EXPECT_EQ(*handle->Get<std::string>(), "");
+  EXPECT_EQ(*handle->TryGet<std::string>(), "");
   handle = flags::FindCommandLineFlag("test_flag_12");
-  EXPECT_EQ(*handle->Get<absl::Duration>(), absl::Minutes(10));
+  EXPECT_EQ(*handle->TryGet<absl::Duration>(), absl::Minutes(10));
 }
 
 // --------------------------------------------------------------------
diff --git a/absl/flags/internal/commandlineflag.cc b/absl/flags/internal/commandlineflag.cc
index 90765a3eb6f3..de588c13166b 100644
--- a/absl/flags/internal/commandlineflag.cc
+++ b/absl/flags/internal/commandlineflag.cc
@@ -22,7 +22,20 @@ namespace flags_internal {
 FlagStateInterface::~FlagStateInterface() {}
 
 bool CommandLineFlag::IsRetired() const { return false; }
-bool CommandLineFlag::IsAbseilFlag() const { return true; }
+
+FlagFastTypeId PrivateHandleInterface::TypeId(const CommandLineFlag& flag) {
+  return flag.TypeId();
+}
+
+std::unique_ptr<FlagStateInterface> PrivateHandleInterface::SaveState(
+    CommandLineFlag* flag) {
+  return flag->SaveState();
+}
+
+bool PrivateHandleInterface::ValidateInputValue(const CommandLineFlag& flag,
+                                                absl::string_view value) {
+  return flag.ValidateInputValue(value);
+}
 
 }  // namespace flags_internal
 ABSL_NAMESPACE_END
diff --git a/absl/flags/internal/commandlineflag.h b/absl/flags/internal/commandlineflag.h
index ef992f7f478d..f807fb9ab650 100644
--- a/absl/flags/internal/commandlineflag.h
+++ b/absl/flags/internal/commandlineflag.h
@@ -93,7 +93,7 @@ class CommandLineFlag {
   // Attempts to retrieve the flag value. Returns value on success,
   // absl::nullopt otherwise.
   template <typename T>
-  absl::optional<T> Get() const {
+  absl::optional<T> TryGet() const {
     if (IsRetired() || !IsOfType<T>()) {
       return absl::nullopt;
     }
@@ -130,29 +130,14 @@ class CommandLineFlag {
   virtual absl::string_view Name() const = 0;
   // Returns name of the file where this flag is defined.
   virtual std::string Filename() const = 0;
-  // Returns name of the flag's value type for some built-in types or empty
-  // string.
-  virtual absl::string_view Typename() const = 0;
   // Returns help message associated with this flag.
   virtual std::string Help() const = 0;
   // Returns true iff this object corresponds to retired flag.
   virtual bool IsRetired() const;
-  // Returns true iff this is a handle to an Abseil Flag.
-  virtual bool IsAbseilFlag() const;
-  // Returns id of the flag's value type.
-  virtual FlagFastTypeId TypeId() const = 0;
-  virtual bool IsModified() const = 0;
   virtual bool IsSpecifiedOnCommandLine() const = 0;
   virtual std::string DefaultValue() const = 0;
   virtual std::string CurrentValue() const = 0;
 
-  // Interfaces to operate on validators.
-  virtual bool ValidateInputValue(absl::string_view value) const = 0;
-
-  // Interface to save flag to some persistent state. Returns current flag state
-  // or nullptr if flag does not support saving and restoring a state.
-  virtual std::unique_ptr<FlagStateInterface> SaveState() = 0;
-
   // Sets the value of the flag based on specified string `value`. If the flag
   // was successfully set to new value, it returns true. Otherwise, sets `error`
   // to indicate the error, leaves the flag unchanged, and returns false. There
@@ -174,9 +159,38 @@ class CommandLineFlag {
   ~CommandLineFlag() = default;
 
  private:
+  friend class PrivateHandleInterface;
+
+  // Returns id of the flag's value type.
+  virtual FlagFastTypeId TypeId() const = 0;
+
+  // Interface to save flag to some persistent state. Returns current flag state
+  // or nullptr if flag does not support saving and restoring a state.
+  virtual std::unique_ptr<FlagStateInterface> SaveState() = 0;
+
   // Copy-construct a new value of the flag's type in a memory referenced by
   // the dst based on the current flag's value.
   virtual void Read(void* dst) const = 0;
+
+  // Interfaces to operate on validators.
+  // Validates supplied value usign validator or parseflag routine
+  virtual bool ValidateInputValue(absl::string_view value) const = 0;
+};
+
+// This class serves as a trampoline to access private methods of
+// CommandLineFlag. This class is intended for use exclusively internally inside
+// of the Abseil Flags implementation
+class PrivateHandleInterface {
+ public:
+  // Access to CommandLineFlag::TypeId.
+  static FlagFastTypeId TypeId(const CommandLineFlag& flag);
+
+  // Access to CommandLineFlag::SaveState.
+  static std::unique_ptr<FlagStateInterface> SaveState(CommandLineFlag* flag);
+
+  // Access to CommandLineFlag::ValidateInputValue.
+  static bool ValidateInputValue(const CommandLineFlag& flag,
+                                 absl::string_view value);
 };
 
 // This macro is the "source of truth" for the list of supported flag built-in
diff --git a/absl/flags/internal/commandlineflag_test.cc b/absl/flags/internal/commandlineflag_test.cc
index c1142b7c5720..c31679f95e7a 100644
--- a/absl/flags/internal/commandlineflag_test.cc
+++ b/absl/flags/internal/commandlineflag_test.cc
@@ -67,7 +67,6 @@ TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
   ASSERT_TRUE(flag_01);
   EXPECT_EQ(flag_01->Name(), "int_flag");
   EXPECT_EQ(flag_01->Help(), "int_flag help");
-  EXPECT_EQ(flag_01->Typename(), "");
   EXPECT_TRUE(!flag_01->IsRetired());
   EXPECT_TRUE(flag_01->IsOfType<int>());
   EXPECT_TRUE(
@@ -80,7 +79,6 @@ TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
   ASSERT_TRUE(flag_02);
   EXPECT_EQ(flag_02->Name(), "string_flag");
   EXPECT_EQ(flag_02->Help(), "string_flag help");
-  EXPECT_EQ(flag_02->Typename(), "");
   EXPECT_TRUE(!flag_02->IsRetired());
   EXPECT_TRUE(flag_02->IsOfType<std::string>());
   EXPECT_TRUE(
@@ -93,7 +91,6 @@ TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
   ASSERT_TRUE(flag_03);
   EXPECT_EQ(flag_03->Name(), "bool_retired_flag");
   EXPECT_EQ(flag_03->Help(), "");
-  EXPECT_EQ(flag_03->Typename(), "");
   EXPECT_TRUE(flag_03->IsRetired());
   EXPECT_TRUE(flag_03->IsOfType<bool>());
   EXPECT_EQ(flag_03->Filename(), "RETIRED");
diff --git a/absl/flags/internal/flag.cc b/absl/flags/internal/flag.cc
index 089567f7ae50..8f0777fa1dc1 100644
--- a/absl/flags/internal/flag.cc
+++ b/absl/flags/internal/flag.cc
@@ -139,19 +139,43 @@ void DynValueDeleter::operator()(void* ptr) const {
 void FlagImpl::Init() {
   new (&data_guard_) absl::Mutex;
 
-  // At this point the default_value_ always points to gen_func.
+  auto def_kind = static_cast<FlagDefaultKind>(def_kind_);
+
   switch (ValueStorageKind()) {
     case FlagValueStorageKind::kAlignedBuffer:
+      // For this storage kind the default_value_ always points to gen_func
+      // during initialization.
+      assert(def_kind == FlagDefaultKind::kGenFunc);
       (*default_value_.gen_func)(AlignedBufferValue());
       break;
     case FlagValueStorageKind::kOneWordAtomic: {
       alignas(int64_t) std::array<char, sizeof(int64_t)> buf{};
-      (*default_value_.gen_func)(buf.data());
-      auto value = absl::bit_cast<int64_t>(buf);
-      OneWordValue().store(value, std::memory_order_release);
+      switch (def_kind) {
+        case FlagDefaultKind::kOneWord:
+          std::memcpy(buf.data(), &default_value_.one_word,
+                      sizeof(default_value_.one_word));
+          break;
+        case FlagDefaultKind::kFloat:
+          std::memcpy(buf.data(), &default_value_.float_value,
+                      sizeof(default_value_.float_value));
+          break;
+        case FlagDefaultKind::kDouble:
+          std::memcpy(buf.data(), &default_value_.double_value,
+                      sizeof(default_value_.double_value));
+          break;
+        default:
+          assert(def_kind == FlagDefaultKind::kGenFunc);
+          (*default_value_.gen_func)(buf.data());
+          break;
+      }
+      OneWordValue().store(absl::bit_cast<int64_t>(buf),
+                           std::memory_order_release);
       break;
     }
     case FlagValueStorageKind::kTwoWordsAtomic: {
+      // For this storage kind the default_value_ always points to gen_func
+      // during initialization.
+      assert(def_kind == FlagDefaultKind::kGenFunc);
       alignas(AlignedTwoWords) std::array<char, sizeof(AlignedTwoWords)> buf{};
       (*default_value_.gen_func)(buf.data());
       auto atomic_value = absl::bit_cast<AlignedTwoWords>(buf);
@@ -196,11 +220,23 @@ void FlagImpl::AssertValidType(FlagFastTypeId rhs_type_id,
 
 std::unique_ptr<void, DynValueDeleter> FlagImpl::MakeInitValue() const {
   void* res = nullptr;
-  if (DefaultKind() == FlagDefaultKind::kDynamicValue) {
-    res = flags_internal::Clone(op_, default_value_.dynamic_value);
-  } else {
-    res = flags_internal::Alloc(op_);
-    (*default_value_.gen_func)(res);
+  switch (DefaultKind()) {
+    case FlagDefaultKind::kDynamicValue:
+      res = flags_internal::Clone(op_, default_value_.dynamic_value);
+      break;
+    case FlagDefaultKind::kGenFunc:
+      res = flags_internal::Alloc(op_);
+      (*default_value_.gen_func)(res);
+      break;
+    case FlagDefaultKind::kOneWord:
+      res = flags_internal::Clone(op_, &default_value_.one_word);
+      break;
+    case FlagDefaultKind::kFloat:
+      res = flags_internal::Clone(op_, &default_value_.float_value);
+      break;
+    case FlagDefaultKind::kDouble:
+      res = flags_internal::Clone(op_, &default_value_.double_value);
+      break;
   }
   return {res, DynValueDeleter{op_}};
 }
@@ -235,8 +271,6 @@ std::string FlagImpl::Filename() const {
   return flags_internal::GetUsageConfig().normalize_filename(filename_);
 }
 
-absl::string_view FlagImpl::Typename() const { return ""; }
-
 std::string FlagImpl::Help() const {
   return HelpSourceKind() == FlagHelpKind::kLiteral ? help_.literal
                                                     : help_.gen_func();
@@ -246,11 +280,6 @@ FlagFastTypeId FlagImpl::TypeId() const {
   return flags_internal::FastTypeId(op_);
 }
 
-bool FlagImpl::IsModified() const {
-  absl::MutexLock l(DataGuard());
-  return modified_;
-}
-
 bool FlagImpl::IsSpecifiedOnCommandLine() const {
   absl::MutexLock l(DataGuard());
   return on_command_line_;
diff --git a/absl/flags/internal/flag.h b/absl/flags/internal/flag.h
index 6da25aa9454a..b2208824508d 100644
--- a/absl/flags/internal/flag.h
+++ b/absl/flags/internal/flag.h
@@ -206,12 +206,72 @@ using FlagDfltGenFunc = void (*)(void*);
 union FlagDefaultSrc {
   constexpr explicit FlagDefaultSrc(FlagDfltGenFunc gen_func_arg)
       : gen_func(gen_func_arg) {}
+  template <typename T>
+  constexpr explicit FlagDefaultSrc(T one_word_value)
+      : one_word(static_cast<int64_t>(one_word_value)) {}
+  constexpr explicit FlagDefaultSrc(float f) : float_value(f) {}
+  constexpr explicit FlagDefaultSrc(double d) : double_value(d) {}
 
   void* dynamic_value;
   FlagDfltGenFunc gen_func;
+  int64_t one_word;
+  float float_value;
+  double double_value;
+};
+
+enum class FlagDefaultKind : uint8_t {
+  kDynamicValue = 0,
+  kGenFunc = 1,
+  kOneWord = 2,
+  kFloat = 3,
+  kDouble = 4
+};
+
+struct FlagDefaultArg {
+  FlagDefaultSrc source;
+  FlagDefaultKind kind;
 };
 
-enum class FlagDefaultKind : uint8_t { kDynamicValue = 0, kGenFunc = 1 };
+// This struct and corresponding overload to InitDefaultValue are used to
+// facilitate usage of {} as default value in ABSL_FLAG macro.
+// TODO(rogeeff): Fix handling types with explicit constructors.
+struct EmptyBraces {};
+
+template <typename T>
+constexpr T InitDefaultValue(T t) {
+  return t;
+}
+
+template <typename T>
+constexpr T InitDefaultValue(EmptyBraces) {
+  return T{};
+}
+
+template <typename ValueT, typename GenT,
+          typename std::enable_if<std::is_integral<ValueT>::value, int>::type =
+              (GenT{}, 0)>
+constexpr FlagDefaultArg DefaultArg(int) {
+  return {FlagDefaultSrc(GenT{}.value), FlagDefaultKind::kOneWord};
+}
+
+template <typename ValueT, typename GenT,
+          typename std::enable_if<std::is_same<ValueT, float>::value,
+                                  int>::type = (GenT{}, 0)>
+constexpr FlagDefaultArg DefaultArg(int) {
+  return {FlagDefaultSrc(GenT{}.value), FlagDefaultKind::kFloat};
+}
+
+template <typename ValueT, typename GenT,
+          typename std::enable_if<std::is_same<ValueT, double>::value,
+                                  int>::type = (GenT{}, 0)>
+constexpr FlagDefaultArg DefaultArg(int) {
+  return {FlagDefaultSrc(GenT{}.value), FlagDefaultKind::kDouble};
+}
+
+template <typename ValueT, typename GenT>
+constexpr FlagDefaultArg DefaultArg(char) {
+  return {FlagDefaultSrc(&GenT::Gen), FlagDefaultKind::kGenFunc};
+}
 
 ///////////////////////////////////////////////////////////////////////////////
 // Flag current value auxiliary structs.
@@ -356,19 +416,19 @@ class FlagImpl final : public flags_internal::CommandLineFlag {
  public:
   constexpr FlagImpl(const char* name, const char* filename, FlagOpFn op,
                      FlagHelpArg help, FlagValueStorageKind value_kind,
-                     FlagDfltGenFunc default_value_gen)
+                     FlagDefaultArg default_arg)
       : name_(name),
         filename_(filename),
         op_(op),
         help_(help.source),
         help_source_kind_(static_cast<uint8_t>(help.kind)),
         value_storage_kind_(static_cast<uint8_t>(value_kind)),
-        def_kind_(static_cast<uint8_t>(FlagDefaultKind::kGenFunc)),
+        def_kind_(static_cast<uint8_t>(default_arg.kind)),
         modified_(false),
         on_command_line_(false),
         counter_(0),
         callback_(nullptr),
-        default_value_(default_value_gen),
+        default_value_(default_arg.source),
         data_guard_{} {}
 
   // Constant access methods
@@ -444,10 +504,8 @@ class FlagImpl final : public flags_internal::CommandLineFlag {
   // CommandLineFlag interface implementation
   absl::string_view Name() const override;
   std::string Filename() const override;
-  absl::string_view Typename() const override;
   std::string Help() const override;
   FlagFastTypeId TypeId() const override;
-  bool IsModified() const override ABSL_LOCKS_EXCLUDED(*DataGuard());
   bool IsSpecifiedOnCommandLine() const override
       ABSL_LOCKS_EXCLUDED(*DataGuard());
   std::string DefaultValue() const override ABSL_LOCKS_EXCLUDED(*DataGuard());
@@ -492,9 +550,10 @@ class FlagImpl final : public flags_internal::CommandLineFlag {
 
   // Mutable flag's state (guarded by `data_guard_`).
 
-  // If def_kind_ == kDynamicValue, default_value_ holds a dynamically allocated
-  // value.
-  uint8_t def_kind_ : 1 ABSL_GUARDED_BY(*DataGuard());
+  // def_kind_ is not guard by DataGuard() since it is accessed in Init without
+  // locks. If necessary we can decrease number of bits used to 2 by folding
+  // one_word storage cases.
+  uint8_t def_kind_ : 3;
   // Has this flag's value been modified?
   bool modified_ : 1 ABSL_GUARDED_BY(*DataGuard());
   // Has this flag been specified on command line.
@@ -530,10 +589,10 @@ class FlagImpl final : public flags_internal::CommandLineFlag {
 template <typename T>
 class Flag {
  public:
-  constexpr Flag(const char* name, const char* filename, const FlagHelpArg help,
-                 const FlagDfltGenFunc default_value_gen)
+  constexpr Flag(const char* name, const char* filename, FlagHelpArg help,
+                 const FlagDefaultArg default_arg)
       : impl_(name, filename, &FlagOps<T>, help,
-              flags_internal::StorageKind<T>(), default_value_gen),
+              flags_internal::StorageKind<T>(), default_arg),
         value_() {}
 
   T Get() const {
@@ -560,9 +619,7 @@ class Flag {
   // CommandLineFlag interface
   absl::string_view Name() const { return impl_.Name(); }
   std::string Filename() const { return impl_.Filename(); }
-  absl::string_view Typename() const { return ""; }
   std::string Help() const { return impl_.Help(); }
-  bool IsModified() const { return impl_.IsModified(); }
   bool IsSpecifiedOnCommandLine() const {
     return impl_.IsSpecifiedOnCommandLine();
   }
@@ -662,20 +719,6 @@ class FlagRegistrar {
   Flag<T>* flag_;  // Flag being registered (not owned).
 };
 
-// This struct and corresponding overload to MakeDefaultValue are used to
-// facilitate usage of {} as default value in ABSL_FLAG macro.
-struct EmptyBraces {};
-
-template <typename T>
-void MakeFromDefaultValue(void* dst, T t) {
-  new (dst) T(std::move(t));
-}
-
-template <typename T>
-void MakeFromDefaultValue(void* dst, EmptyBraces) {
-  new (dst) T{};
-}
-
 }  // namespace flags_internal
 ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/flags/internal/registry.cc b/absl/flags/internal/registry.cc
index eb619c7086ad..62b5b40d88b8 100644
--- a/absl/flags/internal/registry.cc
+++ b/absl/flags/internal/registry.cc
@@ -127,14 +127,13 @@ void FlagRegistry::RegisterFlag(CommandLineFlag* flag) {
               (flag->IsRetired() ? old_flag->Filename() : flag->Filename()),
               "'."),
           true);
-    } else if (flag->TypeId() != old_flag->TypeId()) {
+    } else if (flags_internal::PrivateHandleInterface::TypeId(*flag) !=
+               flags_internal::PrivateHandleInterface::TypeId(*old_flag)) {
       flags_internal::ReportUsageError(
           absl::StrCat("Flag '", flag->Name(),
                        "' was defined more than once but with "
                        "differing types. Defined in files '",
-                       old_flag->Filename(), "' and '", flag->Filename(),
-                       "' with types '", old_flag->Typename(), "' and '",
-                       flag->Typename(), "', respectively."),
+                       old_flag->Filename(), "' and '", flag->Filename(), "'."),
           true);
     } else if (old_flag->IsRetired()) {
       // Retired flag can just be deleted.
@@ -206,7 +205,8 @@ class FlagSaverImpl {
   void SaveFromRegistry() {
     assert(backup_registry_.empty());  // call only once!
     flags_internal::ForEachFlag([&](flags_internal::CommandLineFlag* flag) {
-      if (auto flag_state = flag->SaveState()) {
+      if (auto flag_state =
+              flags_internal::PrivateHandleInterface::SaveState(flag)) {
         backup_registry_.emplace_back(std::move(flag_state));
       }
     });
@@ -290,11 +290,9 @@ class RetiredFlagObj final : public flags_internal::CommandLineFlag {
  private:
   absl::string_view Name() const override { return name_; }
   std::string Filename() const override { return "RETIRED"; }
-  absl::string_view Typename() const override { return ""; }
   FlagFastTypeId TypeId() const override { return type_id_; }
   std::string Help() const override { return ""; }
   bool IsRetired() const override { return true; }
-  bool IsModified() const override { return false; }
   bool IsSpecifiedOnCommandLine() const override { return false; }
   std::string DefaultValue() const override { return ""; }
   std::string CurrentValue() const override { return ""; }
diff --git a/absl/flags/internal/type_erased.cc b/absl/flags/internal/type_erased.cc
index 75b4cdf891a8..5038625be761 100644
--- a/absl/flags/internal/type_erased.cc
+++ b/absl/flags/internal/type_erased.cc
@@ -72,7 +72,9 @@ bool IsValidFlagValue(absl::string_view name, absl::string_view value) {
   CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
 
   return flag != nullptr &&
-         (flag->IsRetired() || flag->ValidateInputValue(value));
+         (flag->IsRetired() ||
+          flags_internal::PrivateHandleInterface::ValidateInputValue(*flag,
+                                                                     value));
 }
 
 // --------------------------------------------------------------------
diff --git a/absl/flags/internal/type_erased.h b/absl/flags/internal/type_erased.h
index 188429c77129..ffe319bad945 100644
--- a/absl/flags/internal/type_erased.h
+++ b/absl/flags/internal/type_erased.h
@@ -75,7 +75,7 @@ inline bool GetByName(absl::string_view name, T* dst) {
   CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
   if (!flag) return false;
 
-  if (auto val = flag->Get<T>()) {
+  if (auto val = flag->TryGet<T>()) {
     *dst = *val;
     return true;
   }
diff --git a/absl/flags/internal/usage.cc b/absl/flags/internal/usage.cc
index a9a5cba94de8..9d856c87a6c0 100644
--- a/absl/flags/internal/usage.cc
+++ b/absl/flags/internal/usage.cc
@@ -54,27 +54,6 @@ ABSL_NAMESPACE_BEGIN
 namespace flags_internal {
 namespace {
 
-absl::string_view TypenameForHelp(const flags_internal::CommandLineFlag& flag) {
-  // Only report names of v1 built-in types
-#define HANDLE_V1_BUILTIN_TYPE(t) \
-  if (flag.IsOfType<t>()) {       \
-    return #t;                    \
-  }
-
-  HANDLE_V1_BUILTIN_TYPE(bool);
-  HANDLE_V1_BUILTIN_TYPE(int32_t);
-  HANDLE_V1_BUILTIN_TYPE(int64_t);
-  HANDLE_V1_BUILTIN_TYPE(uint64_t);
-  HANDLE_V1_BUILTIN_TYPE(double);
-#undef HANDLE_V1_BUILTIN_TYPE
-
-  if (flag.IsOfType<std::string>()) {
-    return "string";
-  }
-
-  return "";
-}
-
 // This class is used to emit an XML element with `tag` and `text`.
 // It adds opening and closing tags and escapes special characters in the text.
 // For example:
@@ -212,23 +191,20 @@ void FlagHelpHumanReadable(const flags_internal::CommandLineFlag& flag,
   // Flag help.
   printer.Write(absl::StrCat("(", flag.Help(), ");"), /*wrap_line=*/true);
 
-  // Flag data type (for V1 flags only).
-  if (!flag.IsAbseilFlag() && !flag.IsRetired()) {
-    printer.Write(absl::StrCat("type: ", TypenameForHelp(flag), ";"));
-  }
-
   // The listed default value will be the actual default from the flag
   // definition in the originating source file, unless the value has
   // subsequently been modified using SetCommandLineOption() with mode
   // SET_FLAGS_DEFAULT.
   std::string dflt_val = flag.DefaultValue();
+  std::string curr_val = flag.CurrentValue();
+  bool is_modified = curr_val != dflt_val;
+
   if (flag.IsOfType<std::string>()) {
     dflt_val = absl::StrCat("\"", dflt_val, "\"");
   }
   printer.Write(absl::StrCat("default: ", dflt_val, ";"));
 
-  if (flag.IsModified()) {
-    std::string curr_val = flag.CurrentValue();
+  if (is_modified) {
     if (flag.IsOfType<std::string>()) {
       curr_val = absl::StrCat("\"", curr_val, "\"");
     }