Delphi Language Guide Delphi for Microsoft Win32 Delphi for the Microsoft. Net framework

Dynamic Variables
You can create dynamic variables by calling the 
GetMem
 or 
New
 procedure. Such variables are allocated on the
heap and are not managed automatically. Once you create one, it is your responsibility ultimately to free the variable's
memory; use 
FreeMem
 to destroy variables created by 
GetMem
 and 
Dispose
 to destroy variables created by
New
. Other standard routines that operate on dynamic variables include 
ReallocMem
, 
AllocMem
, 
Initialize
,
Finalize
, 
StrAlloc
, and 
StrDispose
.
Long strings, wide strings, dynamic arrays, variants, and interfaces are also heap-allocated dynamic variables, but
their memory is managed automatically.