Updating CHANGES.txt and removing all instances of std::is_pod

CHANGES.txt

@@ -12,6 +12,22 @@ Unreleased Changes (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
     implementation detail users must not rely on. It should not be used in
     unit tests.
   * Change the signature of Any::PackFrom() to return false on error.
+  * Add fast reflection getter API for strings.
+  * Constant initialize the global message instances
+  * Avoid potential for missed wakeup in UnknownFieldSet
+  * Now Proto3 Oneof fields have "has" methods for checking their presence in
+    C++.
+  * Bugfix for NVCC
+  * Return early in _InternalSerialize for empty maps.
+  * Adding functionality for outputting map key values in proto path logging
+    output (does not affect comparison logic) and stop printing 'value' in the
+    path. The modified print functionality is in the
+    MessageDifferencer::StreamReporter.
+  * Fixes https://github.com/protocolbuffers/protobuf/issues/8129
+  * Ensure that null char symbol, package and file names do not result in a
+    crash.
+  * Constant initialize the global message instances
+  * Pretty print 'max' instead of numeric values in reserved ranges.
 
   Java
   * Avoid possible UnsupportedOperationException when using CodedInputSteam
@@ -19,10 +35,20 @@ Unreleased Changes (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
   * Make Durations.comparator() and Timestamps.comparator() Serializable.
   * Add more detailed error information for dynamic message field type
     validation failure
+  * Removed declarations of functions declared in java_names.h from
+    java_helpers.h.
+  * Now Proto3 Oneof fields have "has" methods for checking their presence in
+    Java.
+  * Annotates Java proto generated *_FIELD_NUMBER constants.
 
   Python
   * Provided an override for the reverse() method that will reverse the internal
     collection directly instead of using the other methods of the BaseContainer.
+  * MessageFactory.CreateProtoype can be overridden to customize class creation.
+
+  Javascript
+  * Generate `getDescriptor` methods with `*` as their `this` type.
+  * Enforce `let/const` for generated messages.
 
 2020-11-11 version 3.14.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
 

src/google/protobuf/arena.h

@@ -327,7 +327,7 @@ class PROTOBUF_EXPORT PROTOBUF_ALIGNAS(8) Arena final {
   template <typename T>
   PROTOBUF_NDEBUG_INLINE static T* CreateArray(Arena* arena,
                                                size_t num_elements) {
-    static_assert(std::is_pod<T>::value,
+    static_assert(std::is_standard_layout<T>::value && std::is_trivial<T>::value,
                   "CreateArray requires a trivially constructible type");
     static_assert(std::is_trivially_destructible<T>::value,
                   "CreateArray requires a trivially destructible type");

src/google/protobuf/generated_message_table_driven_lite.h

@@ -104,7 +104,7 @@ inline std::string* AddField<std::string>(MessageLite* msg, int64 offset) {
 
 template <typename Type>
 inline void AddField(MessageLite* msg, int64 offset, Type value) {
-  static_assert(std::is_pod<Type>::value,
+  static_assert(std::is_standard_layout<Type>::value && std::is_trivial<Type>::value,
                 "Do not assign");
   *AddField<Type>(msg, offset) = value;
 }
@@ -126,7 +126,7 @@ inline Type* MutableField(MessageLite* msg, uint32* has_bits,
 template <typename Type>
 inline void SetField(MessageLite* msg, uint32* has_bits, uint32 has_bit_index,
                      int64 offset, Type value) {
-  static_assert(std::is_pod<Type>::value,
+  static_assert(std::is_standard_layout<Type>::value && std::is_trivial<Type>::value,
                 "Do not assign");
   *MutableField<Type>(msg, has_bits, has_bit_index, offset) = value;
 }

src/google/protobuf/repeated_field.h

@@ -501,7 +501,7 @@ namespace internal {
 // effectively.
 template <typename Element,
           bool HasTrivialCopy =
-              std::is_pod<Element>::value>
+              std::is_standard_layout<Element>::value && std::is_trivialElement>::value>
 struct ElementCopier {
   void operator()(Element* to, const Element* from, int array_size);
 };