< cpp‎ | memory
Utilities library
Type support (basic types, RTTI, type traits)
Dynamic memory management
Error handling
Program utilities
Variadic functions
Date and time
Function objects
Relational operators
Optional and any
Pairs and tuples
Swap, forward and move
Type operations
Defined in header <memory_resource>
std::pmr::memory_resource* set_default_resource(std::pmr::memory_resource* r);
(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.

[edit] Return value

Returns the previous value of the default memory resource pointer.

[edit] Exceptions

noexcept specification:  

[edit] 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