std.experimental.allocator.building_blocks.null_allocator - D Programming Language

Menu

- Learn
- Documentation
  - Language Reference
  - Library Reference
  - Command-line Reference
  - Feature Overview
  - Articles
- Downloads
- Packages
- Community
  - Blog
  - Orgs using D
  - Twitter
  - Calendar
  - Forums
  - IRC
  - Community Discord
  - Wiki
  - GitHub
  - Issues
  - Get involved
  - Contributors
  - Foundation
  - Security Team
  - Donate
  - Sponsors
- Resources
  - Tour
  - Books
  - Tutorials
  - Tools
  - Editors
  - IDEs
  - run.dlang.io
  - Visual D
  - Acknowledgments
  - D Style
  - Glossary
  - Sitemap

Search
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using a local clone.

# std.experimental.allocator.building_blocks.null_allocator

Source std/experimental/allocator/building_blocks/null_allocator.d

struct `NullAllocator`;
  `NullAllocator` is an emphatically empty implementation of the allocator interface. Although it has no direct use, it is useful as a "terminator" in composite allocators.
  enum uint `alignment`;
    NullAllocator advertises a relatively large alignment equal to 64 KB. This is because NullAllocator never actually needs to honor this alignment and because composite allocators using NullAllocator shouldn't be unnecessarily constrained.
  shared pure nothrow @nogc @safe void[] `allocate`(size_t);
    Always returns null.
  shared pure nothrow @nogc @safe void[] `alignedAllocate`(size_t, uint);
    Always returns null.
  shared pure nothrow @nogc @safe void[] `allocateAll`();
    Always returns null.
  shared pure nothrow @nogc @safe bool `expand`(ref void[] `b`, size_t `s`);
  shared pure nothrow @nogc @safe bool `reallocate`(ref void[] `b`, size_t);
  shared pure nothrow @nogc @safe bool `alignedReallocate`(ref void[] `b`, size_t, uint);
    These methods return false.

    Precondition b is null. This is because there is no other possible legitimate input.

  shared const pure nothrow @nogc @safe Ternary `owns`(const void[]);
    Returns Ternary.no.
  shared const pure nothrow @nogc @safe Ternary `resolveInternalPointer`(const void*, ref void[]);
    Returns Ternary.no.
  shared pure nothrow @nogc @safe bool `deallocate`(void[] `b`);
    No-op.

    Precondition b is null

  shared pure nothrow @nogc @safe bool `deallocateAll`();
    No-op.
  shared const pure nothrow @nogc @safe Ternary `empty`();
    Returns Ternary.yes.
  static shared NullAllocator `instance`;
    Returns the shared global instance of the NullAllocator.

Copyright © 1999-2023 by the D Language Foundation | Page generated by Ddoc on Sun Jan 1 02:21:00 2023