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std.experimental.allocator.common
Utility and ancillary artifacts of std.experimental.allocator. This module
shouldn't be used directly; its functionality will be migrated into more
appropriate parts of std.
Authors:
Andrei Alexandrescu, Timon Gehr (Ternary)
- template
stateSize
(T) - Returns the size in bytes of the state that needs to be allocated to hold an object of type T.
stateSize
!T is zero for structs that are not nested and have no nonstatic member variables. - enum auto
hasStaticallyKnownAlignment
(Allocator); - Returns true if the Allocator has the alignment known at compile time; otherwise it returns false.
- enum ulong
chooseAtRuntime
; chooseAtRuntime
is a compile-time constant of type size_t that several parameterized structures in this module recognize to mean deferral to runtime of the exact value. For example, BitmappedBlock!(Allocator, 4096) (described in detail below) defines a block allocator with block size of 4096 bytes, whereas BitmappedBlock!(Allocator, chooseAtRuntime) defines a block allocator that has a field storing the block size, initialized by the user.- enum ulong
unbounded
; unbounded
is a compile-time constant of type size_t that several parameterized structures in this module recognize to mean "infinite" bounds for the parameter. For example, Freelist (described in detail below) accepts a maxNodes parameter limiting the number of freelist items. Ifunbounded
is passed for maxNodes, then there is no limit and no checking for the number of nodes.- enum uint
platformAlignment
; - The alignment that is guaranteed to accommodate any D object allocation on the current platform.
- size_t
goodAllocSize
(A)(auto ref Aa
, size_tn
); - The default good size allocation is deduced as
n
rounded up to the allocator's alignment. - bool
reallocate
(Allocator)(ref Allocatora
, ref void[]b
, size_ts
); - The default
reallocate
function first attempts to use expand. If Allocator.expand is not defined or returns false,reallocate
allocates a new block of memory of appropriate size and copies data from the old block to the new block. Finally, if Allocator defines deallocate, reallocate uses it to free the old memory block.reallocate
does not attempt to use Allocator.reallocate
even if defined. This is deliberate so allocators may use it internally within their own implementation ofreallocate
. - bool
alignedReallocate
(Allocator)(ref Allocatoralloc
, ref void[]b
, size_ts
, uinta
)
if (hasMember!(Allocator, "alignedAllocate")); - The default
alignedReallocate
function first attempts to use expand. If Allocator.expand is not defined or returns false, alignedReallocate allocates a new block of memory of appropriate size and copies data from the old block to the new block. Finally, if Allocator defines deallocate,alignedReallocate
uses it to free the old memory block.alignedReallocate
does not attempt to use Allocator.reallocate even if defined. This is deliberate so allocators may use it internally within their own implementation of reallocate. - string
forwardToMember
(stringmember
, string[]funs
...); - Forwards each of the methods in
funs
(if defined) tomember
.
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