Intel® oneAPI Threading Building Blocks Developer Guide and API Reference
tbb_allocator
[memory_allocation.tbb_allocator]
A tbb_allocator is a class template that models the allocator requirements from the [allocator.requirements] ISO C++ section.
The tbb_allocator allocates and frees memory via the oneTBB malloc library if it is available, otherwise, it reverts to using std::malloc and std::free.
// Defined in header <oneapi/tbb/tbb_allocator.h>
namespace oneapi {
namespace tbb {
template<typename T> class tbb_allocator {
public:
using value_type = T;
using size_type = std::size_t;
using propagate_on_container_move_assignment = std::true_type;
using is_always_equal = std::true_type;
enum malloc_type {
scalable,
standard
};
tbb_allocator() = default;
template<typename U>
tbb_allocator(const tbb_allocator<U>&) noexcept;
T* allocate(size_type);
void deallocate(T*, size_type);
static malloc_type allocator_type();
};
} // namespace tbb
} // namespace oneapiMember Functions
T*allocate(size_typen)
Allocates n * sizeof(T) bytes. Returns a pointer to the allocated memory.
voiddeallocate(T*p, size_typen)
Deallocates memory pointed to by p. The behavior is undefined if the pointer p is not the result of the allocate(n) method. The behavior is undefined if the memory has been already deallocated.
staticmalloc_typeallocator_type()
Returns the enumeration type malloc_type::scalable if the oneTBB malloc library is available, and malloc_type::standard, otherwise.
Non-member Functions
These functions provide comparison operations between two tbb_allocator instances.
template<typename T, typename U>
bool operator==(const tbb_allocator<T>&, const tbb_allocator<U>&) noexcept;
template<typename T, typename U>
bool operator!=(const tbb_allocator<T>&, const tbb_allocator<U>&) noexcept;The namespace where these functions are defined is unspecified, as long as they may be used in respective binary operation expressions on tbb_allocator objects. For example, an implementation may define the classes and functions in the same unspecified internal namespace and define oneapi::tbb::tbb_allocator as a type alias for which the non-member functions are reachable only via argument-dependent lookup.
template<typenameT,typenameU>booloperator==(consttbb_allocator<T>&, consttbb_allocator<U>&)noexcept
Returns true.
template<typenameT,typenameU>booloperator!=(consttbb_allocator<T>&, consttbb_allocator<U>&)noexcept
Returns false.