23 General utilities library [utilities]

23.10 Memory [memory]

23.10.9 The default allocator [default.allocator] allocator members [allocator.members]

Except for the destructor, member functions of the default allocator shall not introduce data races as a result of concurrent calls to those member functions from different threads. Calls to these functions that allocate or deallocate a particular unit of storage shall occur in a single total order, and each such deallocation call shall happen before the next allocation (if any) in this order.

T* allocate(size_t n);

Returns: A pointer to the initial element of an array of storage of size n * sizeof(T), aligned appropriately for objects of type T.

Remarks: the storage is obtained by calling ​::​operator new, but it is unspecified when or how often this function is called.

Throws: bad_­alloc if the storage cannot be obtained.

void deallocate(T* p, size_t n);

Requires: p shall be a pointer value obtained from allocate(). n shall equal the value passed as the first argument to the invocation of allocate which returned p.

Effects: Deallocates the storage referenced by p .

Remarks: Uses ​::​operator delete, but it is unspecified when this function is called.