std::pmr::polymorphic_allocator<T>::new_object (3) - Linux Manuals

std::pmr::polymorphic_allocator<T>::new_object: std::pmr::polymorphic_allocator<T>::new_object

NAME

std::pmr::polymorphic_allocator<T>::new_object - std::pmr::polymorphic_allocator<T>::new_object

Synopsis


template< class U, class CtorArgs... > (since C++20)
U* new_object( CtorArgs&&... ctor_args );


Allocates and constructs an object of type U.
Equivalent to


  U* p = allocate_object<U>();
  try {
    construct(p, std::forward<CtorArgs>(ctor_args)...);
  } catch (...) {
    deallocate_object(p);
    throw;
  }
  return p;

Parameters


ctor_args - the arguments to forward to the the constructor of U

Return value


A pointer to the allocated and constructed object.

Notes


This function was introduced for use with the fully-specialized allocator std::polymorphic_allocator<>, but it may be useful in any specialization as a shortcut to avoid having to rebind from std::polymorphic_allocator<T> to std::polymorphic_allocator<U>, and having to call allocate, construct, and deallocate individually.
Since U is not deduced, it must be provided as a template argument when calling this function.

Exceptions


May throw any exceptions thrown by the call to allocate_object or the constructor of U.

See also


allocate_bytes Allocate raw aligned memory from the underlying resource
                (public member function)
(C++20)


allocate_object Allocates raw memory suitable for an object or an array
                (public member function)
(C++20)
                Allocate memory
allocate (public member function)


allocate allocates uninitialized storage using the allocator
                (public static member function of std::allocator_traits<Alloc>)
[static]
                allocates memory
allocate (public member function of std::pmr::memory_resource)

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