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Asami Doi, … Joe Mason3

4:35 PM

[cxx] Request for C++ Style Exception: std::function for Swift/C++ Interop

I think https://chromium.googlesource.com/chromium/src/+/main/styleguide/c++/c++-features.md#banned-

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[cxx] Request for C++ Style Exception: std::function for Swift/C++ Interop

I think https://chromium.googlesource.com/chromium/src/+/main/styleguide/c++/c++-features.md#banned-

4:35 PM

Hiroshige Hayashizaki, … Adam Rice3

Feb 16

style reformatting: from "value /*arg*/" to "/*arg=*/value"

I'm not a global OWNER, but I'm in favour of this. I often have to correct this in code

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style reformatting: from "value /*arg*/" to "/*arg=*/value"

I'm not a global OWNER, but I'm in favour of this. I often have to correct this in code

Feb 16

Jan Wilken Dörrie, … Thomas Sepez24

Feb 13

Proposal: Allow std::from_range and direct std::ranges::to

> When making vectors from sets, https://godbolt.org/z/j5fo4bhGd seems to show that in the

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Proposal: Allow std::from_range and direct std::ranges::to

> When making vectors from sets, https://godbolt.org/z/j5fo4bhGd seems to show that in the

Feb 13

Avi Drissman, … Joe Mason19

Feb 12

std::unordered_map and std::unordered_set

Yikes, this thread's moved along since I bookmarked it to reply to... Based on the results of the

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std::unordered_map and std::unordered_set

Yikes, this thread's moved along since I bookmarked it to reply to... Based on the results of the

Feb 12

Erik Chen, … Joe Mason3

Feb 12

Question about base/containers/README.md

The Catan team did an investigation of absl maps performance at the end of last year. TLDR: compared

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Question about base/containers/README.md

The Catan team did an investigation of absl maps performance at the end of last year. TLDR: compared

Feb 12

Peter Kasting, … Kyle Charbonneau8

Feb 9

It's time to default-allow C++20

I've uploaded https://crrev.com/c/7558108 to update the style guide based on the discussion here

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It's time to default-allow C++20

I've uploaded https://crrev.com/c/7558108 to update the style guide based on the discussion here

Feb 9

Thomas Sepez, … Kyle Charbonneau8

Jan 28

Status of std::string::insert_range

Do we usually consider these new convenience methods allowed by default if they're not otherwise

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Status of std::string::insert_range

Do we usually consider these new convenience methods allowed by default if they're not otherwise

Jan 28

Daniel Cheng, Nico Weber2

Jan 27

Allow std::optional::and_then, std::optional::or_else, and std::optional::transform

lgtm Part of the reason for the policy is that the TBD->Propose->Allow flow: 1. Raises

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Allow std::optional::and_then, std::optional::or_else, and std::optional::transform

lgtm Part of the reason for the policy is that the TBD->Propose->Allow flow: 1. Raises

Jan 27

Victor Vianna, … Joe Mason3

Jan 27

Proposal: allow std::out_ptr and std::inout_ptr

It's also worth deciding whether we should allow people to define specializations of std::

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Proposal: allow std::out_ptr and std::inout_ptr

It's also worth deciding whether we should allow people to define specializations of std::

Jan 27

Thomas Sepez, Jan Wilken Dörrie3

Jan 26

std::views::as_rvalue() banned?

Ah, thanks, good to know base/ already has this covered. On Sun, Jan 25, 2026, 10:19 AM Jan Wilken

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std::views::as_rvalue() banned?

Ah, thanks, good to know base/ already has this covered. On Sun, Jan 25, 2026, 10:19 AM Jan Wilken

Jan 26

Victor Vianna, … Marshall Greenblatt10

Jan 22

RFC: replacing base::Contains()

On Mon, Jan 5, 2026 at 5:02 PM 'Victor Vianna' via cxx <c...@chromium.org> wrote: I

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RFC: replacing base::Contains()

On Mon, Jan 5, 2026 at 5:02 PM 'Victor Vianna' via cxx <c...@chromium.org> wrote: I

Jan 22

Victor Vianna, … Joe Mason6

Jan 21

Proposal: allow static operators () and []

On Tue, Jan 20, 2026 at 8:15 PM 'Victor Vianna' via cxx <c...@chromium.org> wrote: >

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Proposal: allow static operators () and []

On Tue, Jan 20, 2026 at 8:15 PM 'Victor Vianna' via cxx <c...@chromium.org> wrote: >

Jan 21

Tommy Nyquist, … Jeremy Roman3

Jan 21

Clarification on CHECK() guidance for pointer dereferences (and history of style guide change)

On Tue, Jan 20, 2026 at 10:50 AM Kyle Charbonneau <kyle...@chromium.org> wrote: (1) Do we

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Clarification on CHECK() guidance for pointer dereferences (and history of style guide change)

On Tue, Jan 20, 2026 at 10:50 AM Kyle Charbonneau <kyle...@chromium.org> wrote: (1) Do we

Jan 21

Victor Vianna, … Jan Wilken Dörrie4

Jan 14

Proposal: allow `if consteval`

+1. This removes a bit gotcha with std::is_constant_evaluated(), which needs to be used with a

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Proposal: allow `if consteval`

+1. This removes a bit gotcha with std::is_constant_evaluated(), which needs to be used with a

Jan 14

Thomas Sepez, … Daniel Cheng4

Jan 13

c++23 std::from_range form of vector constructor

The other thread is https://groups.google.com/a/chromium.org/g/cxx/c/ZzSLYf6-KwQ Daniel On Tue, 13

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c++23 std::from_range form of vector constructor

The other thread is https://groups.google.com/a/chromium.org/g/cxx/c/ZzSLYf6-KwQ Daniel On Tue, 13

Jan 13

Victor Vianna, … Kyle Charbonneau5

Jan 8

Proposal: allow new ranges algorithms

sgtm me too since we have a thread for addressing existing base::Contains() usage. On Thu, Jan 8,

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Proposal: allow new ranges algorithms

sgtm me too since we have a thread for addressing existing base::Contains() usage. On Thu, Jan 8,

Jan 8

Victor Vianna, … Daniel Cheng4

Jan 6

Proposal: allow std::basic_string::contains

+1, thanks! Daniel On Tue, 6 Jan 2026 at 10:31, 'Avi Drissman' via cxx <c...@chromium.org

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Proposal: allow std::basic_string::contains

+1, thanks! Daniel On Tue, 6 Jan 2026 at 10:31, 'Avi Drissman' via cxx <c...@chromium.org

Jan 6

Victor Vianna, … David Benjamin9

Jan 6

Proposal: allow #elifdef and #elifndef

> At a glance, that one might actually be fine with the .*, though adding a test is probably

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Proposal: allow #elifdef and #elifndef

> At a glance, that one might actually be fine with the .*, though adding a test is probably

Jan 6

David Benjamin, … Nico Weber5

Jan 6

Proposal: allow std::byteswap from C++23

I went ahead and lg'd the CL, since this looks very uncontroversial :) On Tue, Jan 6, 2026 at 10:

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Proposal: allow std::byteswap from C++23

I went ahead and lg'd the CL, since this looks very uncontroversial :) On Tue, Jan 6, 2026 at 10:

Jan 6

Erik Jensen, … Hans Wennborg23

12/9/25

Experiment with Coroutines in //remoting?

If Chromium were to decide that it's a priority, we could make them supported. If MSVC can do it,

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Experiment with Coroutines in //remoting?

If Chromium were to decide that it's a priority, we could make them supported. If MSVC can do it,

12/9/25

Avi Drissman, … Joe Mason61

12/8/25

base::ByteCount

FYI, I have a patch in review to convert SystemMemoryInfo to use ByteSize instead of ByteCount. I

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base::ByteCount

FYI, I have a patch in review to convert SystemMemoryInfo to use ByteSize instead of ByteCount. I

12/8/25

Victor Vianna, … Erik Staab7

11/19/25

Rolling out C++23

Re compile size: the compile size builder isn't using modules and there are folks very actively

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Rolling out C++23

Re compile size: the compile size builder isn't using modules and there are folks very actively

11/19/25

Kalvin Lee, Michael Lippautz3

10/20/25

Updating Miracleptr usage guidance (n.b. renderer code)

Thanks for the input. The reference to Member<T> garbage_collected; has been dropped in

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Updating Miracleptr usage guidance (n.b. renderer code)

Thanks for the input. The reference to Member<T> garbage_collected; has been dropped in

10/20/25

Daniel Cheng, Elly3

10/1/25

Default base::JSONReader::Read() to RFC mode?

As of crrev.com/1519103, the JSONReader helpers no longer default to `JSON_PARSE_CHROMIUM_EXTENSIONS`

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Default base::JSONReader::Read() to RFC mode?

As of crrev.com/1519103, the JSONReader helpers no longer default to `JSON_PARSE_CHROMIUM_EXTENSIONS`

10/1/25

Joe Mason, … John Admanski5

9/18/25

absl/hash banned in DEPS?

I ended up refactoring my tests to use absl::flat_hash_map anyway, just because they were simpler

unread,

absl/hash banned in DEPS?

I ended up refactoring my tests to use absl::flat_hash_map anyway, just because they were simpler

9/18/25

Peter Kasting, … Nico Weber19

9/3/25

Indenting for nested preprocessor directives

But we don't do that. We use style=chromium. I disagree that we are beholden to the clang-format

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Indenting for nested preprocessor directives

But we don't do that. We use style=chromium. I disagree that we are beholden to the clang-format

9/3/25

Joe Mason, … Andrew Grieve15

9/2/25

Effect of "static constexpr" in functions

Thanks, everything is working as intended then. I was just confused by the UI. On Tue, Sep 2, 2025 at

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Effect of "static constexpr" in functions

Thanks, everything is working as intended then. I was just confused by the UI. On Tue, Sep 2, 2025 at

9/2/25

Daniel Cheng, … Roland Bock7

8/19/25

Soliciting feedback for C++ portions of Chromium University

Hi, Some thoughts: C++ Memory: Slide 6 "C++ is extremely low level.". I would probably say

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Soliciting feedback for C++ portions of Chromium University

Hi, Some thoughts: C++ Memory: Slide 6 "C++ is extremely low level.". I would probably say

8/19/25

Dana Jansens, … Daniel Cheng36

7/3/25

ranges algorithms

For Chrome, the most relevant problems are that they are quite hard for the compiler to optimize, and

unread,

ranges algorithms

For Chrome, the most relevant problems are that they are quite hard for the compiler to optimize, and

7/3/25

Erik Jensen, … Daniel Cheng8

6/2/25

Preferred replacement to base::Passed for handler that unregisters itself?

The last few instances of base::Passed() are difficult to remove. I've poked at some slowly, but

unread,

Preferred replacement to base::Passed for handler that unregisters itself?

The last few instances of base::Passed() are difficult to remove. I've poked at some slowly, but

6/2/25

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