SYNC_DEFAULT (<allocators>)
Yields a synchronization filter.
#define SYNC_DEFAULT <sync_template>
Remarks
If a compiler supports compiling both single-threaded and multi-threaded applications, for single-threaded applications the macro yields stdext::allocators::sync_none; in all other cases it yields stdext::allocators::sync_shared.
Requirements
Header: <allocators>
Namespace: stdext