2 files changed, 9 insertions, 0 deletions

diff --git a/mem/include/mem.h b/mem/include/mem.h
index 30c24fc..69f426f 100644
--- a/mem/include/mem.h
+++ b/mem/include/mem.h
@@ -79,6 +79,9 @@
 #define mem_get_chunk_handle(MEM, CHUNK_PTR) \
   mem_get_chunk_handle_(&(MEM)->mem, CHUNK_PTR)
 
+/// Return the total capacity of the allocator in bytes.
+#define mem_capacity(MEM) mem_capacity_(&(MEM)->mem)
+
 /// Iterate over the used chunks of the allocator.
 ///
 /// The caller can use 'i' as the index of the current chunk.
@@ -147,3 +150,4 @@ void*  mem_alloc_(Memory*, size_t num_blocks);
 void   mem_free_(Memory*, void** chunk_ptr);
 void*  mem_get_chunk_(const Memory*, size_t chunk_handle);
 size_t mem_get_chunk_handle_(const Memory*, const void* chunk);
+size_t mem_capacity_(const Memory*);
diff --git a/mem/src/mem.c b/mem/src/mem.c
index ff97f0f..056d947 100644
--- a/mem/src/mem.c
+++ b/mem/src/mem.c
@@ -181,3 +181,8 @@ size_t mem_get_chunk_handle_(const Memory* mem, const void* chunk) {
   assert(block_byte_index % mem->block_size_bytes == 0);
   return block_byte_index / mem->block_size_bytes;
 }
+
+size_t mem_capacity_(const Memory* mem) {
+  assert(mem);
+  return mem->num_blocks * mem->block_size_bytes;
+}