Reimplement HeapPage class

src/database/buffer_pool.cpp

@@ -11,10 +11,6 @@ BufferPool::~BufferPool() {
   buffer_pool = nullptr;
 }
 
-int BufferPool::get_page_size() {
-  return PAGE_SIZE;
-}
-
 Page * BufferPool::get_page(TransactionId * tid, 
                             PageId * pid, 
                             Permissions * perm) {
@@ -126,7 +122,7 @@ void BufferPool::InsertTuple(TransactionId * tid, int table_id, Tuple * t) {
   std::vector<Page*> page_vector =
       catalog->get_db_file(table_id)->AddTuple(*tid, *t);
   for (Page * page: page_vector) {
-    page->MarkDirty(true, *tid);
+    page->MarkDirty(true, tid);
   }
 }
 
@@ -136,7 +132,7 @@ void BufferPool::DeleteTuple(TransactionId * tid, Tuple * t) {
 
   DbFile * db_file = catalog->get_db_file(table_id);
 
-  db_file->DeleteTuple(*tid, *t)->MarkDirty(true, *tid);
+  db_file->DeleteTuple(*tid, *t)->MarkDirty(true, tid);
 }
 
 void BufferPool::FlushAllPages() {

src/database/heap_file.cpp

@@ -25,7 +25,7 @@ TupleDesc HeapFile::get_tuple_desc() const {
 }
 
 int HeapFile::get_num_pages() {
-  return (int) ceil(ftell(file) / BufferPool::get_page_size());
+  return (int) ceil(ftell(file) / BufferPool::PAGE_SIZE);
 }
 
 Page * HeapFile::ReadPage(PageId * pid) {