expose in pallet_prelude

frame/support/src/lib.rs

@@ -77,6 +77,7 @@ pub use self::storage::{
 	StorageValue, StorageMap, StorageDoubleMap, StorageNMap, StoragePrefixedMap,
 	IterableStorageMap, IterableStorageDoubleMap, IterableStorageNMap, migration,
 	bounded_vec::{BoundedVec, BoundedSlice}, weak_bounded_vec::WeakBoundedVec,
+	counted_map::CountedStorageMap,
 };
 pub use self::dispatch::{Parameter, Callable};
 pub use sp_runtime::{self, ConsensusEngineId, print, traits::Printable};
@@ -1248,6 +1249,7 @@ pub mod pallet_prelude {
 			OptionQuery,
 		},
 		storage::bounded_vec::BoundedVec,
+		CountedStorageMap,
 	};
 	pub use codec::{Encode, Decode};
 	pub use crate::inherent::{InherentData, InherentIdentifier, ProvideInherent};

frame/support/src/storage/counted_map.rs

@@ -299,9 +299,16 @@ where
 	///
 	/// This function iterates through all the items in the map and sets the counter. This operation
 	/// can be very heavy, so use with caution.
+	///
+	/// Returns the number of items in the map which is used to set the counter.
 	pub fn initialize_counter() -> u32 {
 		let count = Self::iter_values().count() as u32;
 		Counter::set(count);
 		count
 	}
+
+	/// Return the count.
+	pub fn count() -> u32 {
+		Counter::get()
+	}
 }