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The function <<ref_get_null_resource>> returns a global instance of the null resource. This resource offers a simple invariant: all calls to allocate will throw the exception `std::bad_alloc`. An instance of the null resource can be used to make parsing guarantee that allocations from the heap are never made. This is explored in more detail in a later section.
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The containers <<ref_array>>, <<ref_object>>, and <<ref_value>> all propagate the memory resource they were constructed with to child elements:
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It is important to note that <<ref_storage_ptr>> supports both shared-ownership and reference lifetime models. Construction from a memory resource pointer does not transfer ownership:
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Shared ownership is achieved using the function <<ref_make_shared_resource>>, which creates a new, reference-counted memory resource using a dynamic memory allocation and returns it as a <<ref_storage_ptr>>:
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