Returns a pointer to a memory_resource that doesn't perform any allocation.
Returns a pointer p to a static storage duration object of a type derived from std::pmr::memory_resource, with the following properties:
allocate() function always throws std::bad_alloc;deallocate() function has no effect;memory_resource r, p->is_equal(r) returns &r == p.The same value is returned every time this function is called.
[edit] ExampleThe program demos the main usage of null_memory_resource: ensure that a memory pool which requires memory allocated on the stack will NOT allocate memory on the heap if it needs more memory.
Possible output:
size: 50... size: 100... size: 150... std::bad_alloc size: 183
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