pitrou commented on a change in pull request #8205:
URL: https://github.com/apache/arrow/pull/8205#discussion_r492005479



##########
File path: cpp/src/arrow/util/atomic_shared_ptr.h
##########
@@ -89,5 +89,25 @@ inline void atomic_store(
   *p = r;
 }
 
+template <class T>
+inline bool atomic_compare_exchange_strong(

Review comment:
       All other functions are explicitly marked inline in this file, but I can 
make the change.

##########
File path: cpp/src/arrow/util/atomic_shared_ptr.h
##########
@@ -89,5 +89,25 @@ inline void atomic_store(
   *p = r;
 }
 
+template <class T>
+inline bool atomic_compare_exchange_strong(

Review comment:
       All other functions are explicitly marked inline in this file, but I can 
make the change if desired.

##########
File path: cpp/src/arrow/type_traits.h
##########
@@ -22,7 +22,7 @@
 #include <type_traits>
 #include <vector>
 
-#include "arrow/type_fwd.h"
+#include "arrow/type.h"

Review comment:
       Yes, there are errors such as:
   ```
   ../src/arrow/type_traits.h:149:1: error: incomplete type 'arrow::UInt8Type' 
named in nested name specifier
   PRIMITIVE_TYPE_TRAITS_DEF(uint8_t, UInt8, uint8)
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   ../src/arrow/type_traits.h:145:14: note: expanded from macro 
'PRIMITIVE_TYPE_TRAITS_DEF'
         CType, ARROW_CONCAT(ArrowShort, Type), ARROW_CONCAT(ArrowShort, 
Array), \
         
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   ../src/arrow/util/macros.h:24:28: note: expanded from macro 'ARROW_CONCAT'
   #define ARROW_CONCAT(x, y) x##y
                              ^
   <scratch space>:126:1: note: expanded from here
   UInt8Type
   ^
   ../src/arrow/type_traits.h:130:19: note: expanded from macro 
'PRIMITIVE_TYPE_TRAITS_DEF_'
       using CType = ArrowType_::c_type;                                        
            \
                     ^~~~~~~~~~~~
   ../src/arrow/type_fwd.h:186:1: note: forward declaration of 
'arrow::UInt8Type'
   _NUMERIC_TYPE_DECL(UInt8)
   ^
   ../src/arrow/type_fwd.h:176:9: note: expanded from macro '_NUMERIC_TYPE_DECL'
     class KLASS##Type;                                  \
           ^
   <scratch space>:274:1: note: expanded from here
   UInt8Type
   ^
   ```




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