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### 1003. Require more useful headers for freestanding implementations

Section: 16.4.2.4 [compliance] Status: NAD Submitter: Alisdair Meredith Opened: 2009-03-11 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses JP 23 [CD1]

There is a freestanding implementation including `<type_traits>`, `<array>`, `<ratio>`, lately added to Table 13, C++ library headers. Programmers think them useful and hope that these headers are also added to Table 15, C++ headers for freestanding implementations, that shows the set of headers which a freestanding implementation shall include at least.

Original proposed resolution

Add `<type_traits>`, `<array>`, `<ratio>` to Table 15.

[ Summit: ]

> The `<array>` header has far too many dependencies to require for a free-standing implementation.

> The `<ratio>` header would be useful, has no dependencies, but is not strictly necessary.

> The `<type_traits>` header is fundamentally a core language facility with a library interface, so should be supported.

> (it is anticipated the resolution will come via an update to paper N2814) (see also LWG 833)

[ Batavia (2009-05): ]

> Leave in Review status pending a paper on freestanding implementations by Martin Tasker.

[ 2009-07 Frankfurt: ]

> Move this to NAD.

> We considered all of the listed headers, and found a compelling case only for the inclusion of `<type_traits>` in the list of headers required of a freestanding implementation.

> See Martin Tasker's paper Fixing Freestanding which provides the wording to include `<type_traits>` into freestanding implementations.

Proposed resolution:

Add `<type_traits>` to Table 15.