< cpp‎ | memory
Dynamic memory management
Uninitialized storage
Garbage collection support
C Library
Low level memory management
Defined in header <memory_resource>
std::pmr::memory_resource* set_default_resource(std::pmr::memory_resource* r) noexcept;
(since C++17)

If r is not null, sets the default memory resource pointer to r; otherwise, sets the default memory resource pointer to std::pmr::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 std::pmr::new_delete_resource.

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

Return value

Returns the previous value of the default memory resource pointer.

See also

gets the default std::pmr::memory_resource
returns a static program-wide std::pmr::memory_resource that uses the global operator new and operator delete to allocate and deallocate memory