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[PR #6921] Replace basic_string_view<T> with span<const T> #26816

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opened 2026-01-31 09:18:19 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:18:19 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/6921

State: closed
Merged: Yes

We were using std::basic_string_view as a stand-in for std::span so that
we could change over all at once when C++20 dropped with full span
support. That day's not here yet, but as of 54a7fce3e we're using GSL 3,
whose span is C++20-compliant.

This commit replaces every instance of basic_string_view that was not
referring to an actual string with a span of the appropriate type.

I moved the const qualifier into span's T because while
basic_string_view.at() returns const T&, span.at() returns T&
(without the const). I wanted to maintain the invariant that members of
the span were immutable.

  • Mechanical Changes
    • sv.at(x) -> gsl::at(sp, x)
    • sv.c{begin,end} -> sp.{begin,end} (span's iterators are const)

I had to replace a std::basic_string<> with a std::vector<> in
ConImeInfo, and I chose to replace a manual array walk in
ScreenInfoUiaProviderBase with a ranged-for. Please review those
specifically.

This will almost certainly cause a code size regression in Windows
because I'm blowing out all the PGO counts. Whoops.

Related: #3956, #975.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/6921 **State:** closed **Merged:** Yes --- We were using std::basic_string_view as a stand-in for std::span so that we could change over all at once when C++20 dropped with full span support. That day's not here yet, but as of 54a7fce3e we're using GSL 3, whose span is C++20-compliant. This commit replaces every instance of basic_string_view that was not referring to an actual string with a span of the appropriate type. I moved the `const` qualifier into span's `T` because while `basic_string_view.at()` returns `const T&`, `span.at()` returns `T&` (without the const). I wanted to maintain the invariant that members of the span were immutable. * Mechanical Changes * `sv.at(x)` -> `gsl::at(sp, x)` * `sv.c{begin,end}` -> `sp.{begin,end}` (span's iterators are const) I had to replace a `std::basic_string<>` with a `std::vector<>` in ConImeInfo, and I chose to replace a manual array walk in ScreenInfoUiaProviderBase with a ranged-for. Please review those specifically. This will almost certainly cause a code size regression in Windows because I'm blowing out all the PGO counts. Whoops. Related: #3956, #975.
claunia added the pull-request label 2026-01-31 09:18:19 +00:00
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Reference: starred/terminal#26816
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