Describes a synchronization filter that provides a separate cache object for each thread.

template <class Cache>  
class sync_per_thread

Allocators that use sync_per_thread can compare equal even though blocks allocated in one thread cannot be deallocated from another thread. When using one of these allocators memory blocks allocated in one thread should not be made visible to other threads. In practice this means that a container that uses one of these allocators should only be accessed by a single thread.

Header: <allocators>

Namespace: stdext

Allocates a block of memory.

void *allocate(std::size_t count);

The member function returns the result of a call to cache::allocate(count) on the cache object belonging to the current thread. If no cache object has been allocated for the current thread, it first allocates one.

Frees a specified number of objects from storage beginning at a specified position.

void deallocate(void* ptr, std::size_t count);

The member function calls deallocate on the cache object belonging to the current thread. If no cache object has been allocated for the current thread, it first allocates one.

Compares two caches for equality.

bool equals(const sync<Cache>& Other) const;

false if no cache object has been allocated for this object or for Other in the current thread. Otherwise it returns the result of applying operator== to the two cache objects.

<allocators>