<streambuf>: basic_streambuf doesn't support 64-bit properly
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Description
std::basic_streambuf doesn't support 64-bit properly, because it holds the counters in 32-bit ints:
Then e.g. in std::basic_streambuf::setg(...) you have:
and forcing a cast to int prevents from using with a memory range bigger than ~2GB (even on Win64 builds).
Also tracked by DevCom-102668, DevCom-290124, DevCom-320893, DevCom-859581, and Microsoft-internal VSO-485517 / AB#485517.
vNext note: Resolving this issue will require breaking binary compatibility. We won't be able to accept pull requests for this issue until the vNext branch is available. See #169 for more information.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with stl/inc/streambuf at the linked counter definitions and basic_streambuf::setg(...), then read #169 for the vNext and binary-compatibility constraints. The issue is ready only when the vNext branch is available; done means 64-bit memory ranges are supported without the current 32-bit limitations and the relevant compatibility requirements are met.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100