Move type_traits header to be public internal

A Firestore header depends on this, so it needs to be publicly available.

PiperOrigin-RevId: 312709779

Author: a-maurice

app/CMakeLists.txt

@@ -212,6 +212,7 @@ set(internal_HDRS
     src/include/firebase/future.h
     src/include/firebase/internal/common.h
     src/include/firebase/internal/future_impl.h
+    src/include/firebase/internal/type_traits.h
     src/include/firebase/log.h
     src/include/firebase/util.h
     src/include/firebase/variant.h
@@ -294,7 +295,6 @@ add_library(firebase_app STATIC
     ${app_platform_HDRS}
     ${FIREBASE_GEN_FILE_DIR}/app/google_services_generated.h
     memory/atomic.h
-    meta/type_traits.h
     meta/move.h
     memory/unique_ptr.h
     memory/shared_ptr.h)

app/memory/shared_ptr.h

@@ -21,7 +21,7 @@
 #include "app/memory/atomic.h"
 #include "app/memory/unique_ptr.h"
 #include "app/meta/move.h"
-#include "app/meta/type_traits.h"
+#include "app/src/include/firebase/internal/type_traits.h"
 
 #if !defined(FIREBASE_NAMESPACE)
 #define FIREBASE_NAMESPACE firebase

app/memory/unique_ptr.h

@@ -18,7 +18,7 @@
 #define FIREBASE_APP_CLIENT_CPP_MEMORY_UNIQUE_PTR_H_
 
 #include "app/meta/move.h"
-#include "app/meta/type_traits.h"
+#include "app/src/include/firebase/internal/type_traits.h"
 
 #if !defined(FIREBASE_NAMESPACE)
 #define FIREBASE_NAMESPACE firebase

app/meta/move.h

@@ -17,7 +17,7 @@
 #ifndef FIREBASE_APP_CLIENT_CPP_META_MOVE_H_
 #define FIREBASE_APP_CLIENT_CPP_META_MOVE_H_
 
-#include "app/meta/type_traits.h"
+#include "app/src/include/firebase/internal/type_traits.h"
 
 #if !defined(FIREBASE_NAMESPACE)
 #define FIREBASE_NAMESPACE firebase

app/meta/type_traits.h renamed to app/src/include/firebase/internal/type_traits.h

@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef FIREBASE_APP_CLIENT_CPP_META_TYPE_TRAITS_H_
-#define FIREBASE_APP_CLIENT_CPP_META_TYPE_TRAITS_H_
+#ifndef FIREBASE_APP_CLIENT_CPP_SRC_INCLUDE_FIREBASE_INTERNAL_TYPE_TRAITS_H_
+#define FIREBASE_APP_CLIENT_CPP_SRC_INCLUDE_FIREBASE_INTERNAL_TYPE_TRAITS_H_
 
 #include <cstdlib>
 #include <type_traits>
@@ -24,6 +24,10 @@
 #define FIREBASE_NAMESPACE firebase
 #endif
 
+// Doxygen breaks trying to parse this file, and since it is internal logic,
+// it doesn't need to be included in the generated documentation.
+#ifndef DOXYGEN
+
 namespace FIREBASE_NAMESPACE {
 
 template <typename T>
@@ -120,4 +124,6 @@ struct is_integer {
 // NOLINTNEXTLINE - allow namespace overridden
 }  // namespace FIREBASE_NAMESPACE
 
-#endif  // FIREBASE_APP_CLIENT_CPP_META_TYPE_TRAITS_H_
+#endif  // DOXYGEN
+
+#endif  // FIREBASE_APP_CLIENT_CPP_SRC_INCLUDE_FIREBASE_INTERNAL_TYPE_TRAITS_H_

firestore/src/include/firebase/firestore/field_value.h

@@ -23,7 +23,7 @@
 #include <string>
 #include <vector>
 
-#include "app/meta/type_traits.h"
+#include "firebase/internal/type_traits.h"
 #include "firebase/firestore/map_field_value.h"
 
 namespace firebase {