std::allocation_result
From cppreference.com
Defined in header <memory>
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template< class Pointer, class SizeType = std::size_t > struct allocation_result; |
(since C++23) | |
allocation_result
specializations are returned from the allocate_at_least
member function of appropriate Allocator types (e.g. std::allocator::allocate_at_least) and std::allocator_traits::allocate_at_least.
Every specialization of allocation_result
has no base classes or declared members other than ptr
and count
, thus it is suitable for aggregate initialization and structured binding.
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Template parameters
Pointer | - | typically std::allocator_traits<Alloc>::pointer, where Alloc is an Allocator type
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SizeType | - | typically std::allocator_traits<Alloc>::size_type, where Alloc is an Allocator type
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Data members
Member name | Definition |
ptr |
a pointer of type Pointer which is typically used for the address of the first element in the storage allocated by allocate_at_least (public member object) |
count |
a value of type SizeType which is typically used for the actual number of elements in the storage allocated by allocate_at_least (public member object) |
Notes
Pointer
and SizeType
are a pointer to an object type and std::make_unsigned_t<std::ptrdiff_t> (which is almost always same as std::size_t) by default.
Feature-test macro | Value | Std | Feature |
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__cpp_lib_allocate_at_least |
202302L | (C++23) | Size-feedback in the Allocator interface |
Example
This section is incomplete Reason: no example |
See also
(C++23) |
allocates uninitialized storage at least as large as requested size (public member function of std::allocator<T> )
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[static] (C++23) |
allocates storage at least as large as the requested size via an allocator (public static member function of std::allocator_traits<Alloc> )
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