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# std::experimental::pmr::set_default_resource

From cppreference.com
< cpp‎ | experimental

Defined in header `<experimental/memory_resource>` |  |
memory_resource* set_default_resource(memory_resource* r); |  | (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.

### [edit] Return value

Returns the previous value of the default memory resource pointer.

### [edit] Exceptions

`noexcept` specification:
noexcept

### [edit] See also

get_default_resource | gets the default `memory_resource` (function) [edit]
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) [edit]

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