# std::experimental::pmr::set_default_resource

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< cpp‎ | experimental

Defined in header `<experimental/memory_resource>` |  |
memory_resource* set_default_resource(memory_resource* r) noexcept; |  | (library fundamentals TS)

If `r` is not null, sets the default memory resource pointer to `r`; otherwise, sets the default memory resource pointer to `new_delete_resource()`.

The default memory resource pointer is used by certain facilities when an explicit memory resource is not supplied. The initial default memory resource pointer is the return value of `new_delete_resource()`.

This function is thread-safe. Every call to `set_default_resource` synchronizes with (see std::memory_order) the subsequent `set_default_resource` and get_default_resource calls.

### Return value

Returns the previous value of the default memory resource pointer.

### See also

get_default_resource | gets the default `memory_resource` (function)
new_delete_resource | returns a static program-wide `memory_resource` that uses the global operator new and operator delete to allocate and deallocate memory (function)

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