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### 2429. `std::basic_ostringstream` is missing an allocator-extended constructor

Section: 31.8.4 [ostringstream] Status: NAD Submitter: Markus Kemp Opened: 2014-09-03 Last modified: 2017-03-21

Priority: Not Prioritized

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Discussion:

I initially brought this issue up on Stack Overflow, where I was then told to make a topic about this problem on std-discussion, where I was then in turn asked to report the issue.

The problem: The `std::basic_ostringstream` class template can be instantiated with an allocator type, but none of the constructors provided accept an allocator argument, which means it's impossible to use `std::basic_ostringstream` with stateful allocators. The C++ Standard Library Defect Report List seems to already mention a similar issue (2210).

[2014-11 Urbana]

Closed as NAD

This is not a rejection of the suggestion, but an observation that simply adding an allocator-aware constructor is only part of the problem. `stringstream` returns the `string` assembled in its buffer by value, as the result of a call to `str`, and typically this will not use the same allocator as would be supplied at construction.

The appropriate way to make progress on this issue, if motivated, is to submit a paper to LEWG addressing the larger design concerns in addition to 'just' adding an (optional) allocator to the constructors.

Proposed resolution: