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Restrict Object Allocation to Specific Memory Types

While C++'s three memory storage types provide an unparalleled degree of flexibility with respect to memory management, this diversity can sometimes make things more difficult—like when you need to allocate objects of a certain class exclusively on the free-store. Find out how to enforce memory allocation policies by controlling the access type of a class's member functions.


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C++ inherited from C its three memory storage types: automatic storage (also called stack memory), static storage for namespace-scope objects and local static objects, and the free-store(also called the heap), which is used for dynamically-allocated objects.

In many cases, this diversity complicates things. For example, in mobile platforms such as Symbian, free-store objects are mandatory due to the system's tiny stack size. Likewise, garbage collectors and smart-pointers require that objects be allocated on the free-store exclusively. But in other cases, you want to ensure that objects are neverallocated on the free-store. The following sections show how to enforce such class-specific memory usage policies.


How do you ensure that objects of a certain class are allocated on the free-store exclusively? Similarly, how can you encourage automatic and static storage types for a given class while disabling free-store allocation?




Enforce memory allocation policies by controlling the access type of a class's member functions.



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