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Showing content from https://cplusplus.github.io/LWG/issue3309 below:

Is <ios> implicitly #included by <sstream>, <fstream> etc.?

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3309. Is <ios> implicitly #included by <sstream>, <fstream> etc.?

Section: 31.8 [string.streams], 31.10 [file.streams] Status: New Submitter: Jens Maurer Opened: 2019-11-01 Last modified: 2019-11-04

Priority: 3

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Discussion:

It is unclear whether the streams headers implicitly #include <ios> and make (for example) the name std::basic_ios available after including <sstream>.

This question becomes more important as header units arrive with modules, where there is an explicit choice whether to re-export names from subordinate headers.

[2019-11 Priority to 3 during Monday issue prioritization in Belfast]

Proposed resolution:

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