Which Headers in the C Standard Library Guarantee Specific Functionalities or Inclusions?

Headers in C Standard Library with Guaranteed Inclusions

In the C standard library, headers may include each other in various ways that are not explicitly specified. While programmers should generally avoid relying on header inclusions, there are a few exceptions where specific headers are guaranteed to be included or provide functionality that would otherwise require including an additional header.

Headers Guaranteed to Include Others

• is included by:

• includes:

• includes:

• includes:

Functions Available through Indirect Header Inclusions

• Free function templates:

  • std::begin
  • std::end
  • C 14 c-, r-, and cr- versions
  • C 17 std::size, std::empty, std::data

These functions are nominally located in , but they are also available when any of the following headers are included:

- `<array>`
- `<deque>`
- `<forward_list>`
- `<list>`
- `<map>`
- `<regex>`
- `<set>`
- `<string>`
- `<unordered_map>`
- `<unordered_set>`
- `<vector>`

• When is included:

  • *begin, *end
  • Generic std::swap

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