std::pmr::monotonic_buffer_resource::do_allocate

 

C++

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Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

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Regular expressions library (C++11)

Atomic operations library (C++11)

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Technical Specifications

 

Dynamic memory management

Smart pointers unique_ptr (C++11) shared_ptr (C++11) weak_ptr (C++11) auto_ptr (until C++17) owner_less (C++11) enable_shared_from_this (C++11) bad_weak_ptr (C++11) default_delete (C++11) Allocators allocator allocator_traits (C++11) allocator_arg_t (C++11) allocator_arg (C++11) uses_allocator (C++11) uses_allocator_construction_args (C++20) make_obj_using_allocator (C++20) uninitialized_construct_using_allocator (C++20) scoped_allocator_adaptor (C++11) pmr::polymorphic_allocator (C++17) Memory resources pmr::memory_resource (C++17) pmr::get_default_resource (C++17) pmr::set_default_resource (C++17) pmr::new_delete_resource (C++17) pmr::null_memory_resource (C++17) pmr::synchronized_pool_resource (C++17) pmr::unsynchronized_pool_resource (C++17) pmr::monotonic_buffer_resource (C++17) pmr::pool_options (C++17)

Uninitialized storage uninitialized_copy uninitialized_fill uninitialized_move (C++17) uninitialized_default_construct (C++17) uninitialized_value_construct (C++17) destroy (C++17) uninitialized_copy_n (C++11) uninitialized_fill_n uninitialized_move_n (C++17) uninitialized_default_construct_n (C++17) uninitialized_value_construct_n (C++17) destroy_n (C++17) destroy_at (C++17) raw_storage_iterator (until C++20) get_temporary_buffer (until C++20) return_temporary_buffer (until C++20) Garbage collection support declare_reachable (C++11) undeclare_reachable (C++11) declare_no_pointers (C++11) undeclare_no_pointers (C++11) pointer_safety (C++11) get_pointer_safety (C++11) Miscellaneous pointer_traits (C++11) to_address (C++20) addressof (C++11) align (C++11) assume_aligned (C++20) C Library malloc aligned_alloc (C++17) calloc realloc free Low level memory management

 

std::pmr::monotonic_buffer_resource

monotonic_buffer_resource::monotonic_buffer_resource

monotonic_buffer_resource::~monotonic_buffer_resource

Public member functions

monotonic_buffer_resource::release

monotonic_buffer_resource::upstream_resource

Protected member functions

monotonic_buffer_resource::do_allocate

monotonic_buffer_resource::do_deallocate

monotonic_buffer_resource::do_is_equal

 

virtual void* do_allocate(std::size_t bytes, std::size_t alignment);		(since C++17)

Allocates storage.

If the current buffer has sufficient unused space to fit a block with the specified size and alignment, allocates the return block from the current buffer.

Otherwise, this function allocates a new buffer by calling upstream_resource()->allocate(n, m), where n is not less than the greater of bytes and the next buffer size and m is not less than alignment. It sets the new buffer as the current buffer, increases the next buffer size by an implementation-defined growth factor (which is not necessarily integral), and then allocates the return block from the newly allocated buffer.

Return value

A pointer to allocated storage of at least bytes bytes in size, aligned to the specified alignment if such alignment is supported, and to alignof(std::max_align_t) otherwise.

Exceptions

Throws nothing unless calling allocate() on the upstream memory resource throws.

See also

allocate	allocates memory (public member function of std::pmr::memory_resource)
do_allocate [virtual]	allocates memory (virtual private member function of std::pmr::memory_resource)