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std::pmr::polymorphic_allocator<T>::allocate_object

From cppreference.com
 
 
Dynamic memory management
Uninitialized storage
Garbage collection support
Miscellaneous
(C++20)
(C++11)
(C++11)
C Library
Low level memory management
 
 
template< class U >
[[nodiscard]] U* allocate_object( std::size_t n = 1 );
(since C++20)

Allocates storage for n objects of type U using the underlying memory resource.

If std::numeric_limits<std::size_t>::max() / sizeof(U) < n, throws std::bad_array_new_length, otherwise equivalent to return static_cast<U*>(allocate_bytes(n * sizeof(U), alignof(U)) );

Contents

[edit] Parameters

n - the number of objects to allocate storage for

[edit] Return value

A pointer to the allocated storage.

[edit] 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>.

Since U is not deduced, it must be provided as a template argument when calling this function.

[edit] Exceptions

Throws std::bad_array_new_length if n > std::numeric_limits<std::size_t>::max() / sizeof(U); may also any exceptions thrown by the call to resource()->allocate.

[edit] See also

Allocate raw aligned memory from the underlying resource
(public member function) [edit]
Allocates and constructs an object
(public member function) [edit]
Allocate memory
(public member function) [edit]
[static]
allocates uninitialized storage using the allocator
(public static member function of std::allocator_traits<Alloc>) [edit]
allocates memory
(public member function of std::pmr::memory_resource) [edit]