| commit | ef1a1b99259b83fed053f86f6a1380801930728a | [log] [tgz] |
|---|---|---|
| author | Jan Wilken Dörrie <jdoerrie@chromium.org> | Wed Jan 07 06:22:49 2026 |
| committer | Copybara-Service <copybara-worker@google.com> | Wed Jan 07 06:30:26 2026 |
| tree | bbcae86522e8cb9c390501ac221ce15c5286182f | |
| parent | 61744ae7b1ef676b3508b14d9f993d07a195e7a5 [diff] |
[base] Allow specifying result type in base::ToVector Currently, base::ToVector deduces the output vector's value type based on the range's value type or the projection's return type. This change adds support for explicitly specifying the destination value type via a template argument. This enables conversions during vector construction, such as creating a std::vector<int64_t> from a range of ints, or a std::vector<std::string_view> from an array of string literals. To facilitate this, base::projected_value_t is introduced as a backport of the C++26 utility, ensuring correct type deduction when no explicit type is provided. Change-Id: Ieb74e8371d641fae79fa867aa816d5b95f541b27 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7393726 Reviewed-by: Daniel Cheng <dcheng@chromium.org> Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org> Cr-Commit-Position: refs/heads/main@{#1565438} NOKEYCHECK=True GitOrigin-RevId: e19160e3eedab1e30194c43f1d8f2078e260a9d7
Contains a written down set of principles and other information on //base. Please add to it!
Chromium is a very mature project. Most things that are generally useful are already here and things not here aren't generally useful.
The bar for adding stuff to base is that it must have demonstrated wide applicability. Prefer to add things closer to where they're used (i.e. “not base”), and pull into base only when needed. In a project our size, sometimes even duplication is OK and inevitable.
Adding a new logging macro DPVELOG_NE is not more clear than just writing the stuff you want to log in a regular logging statement, even if it makes your calling code longer. Just add it to your own code.
If the code in question does not need to be used inside base, but will have multiple consumers across the codebase, consider placing it in a new directory under components/ instead.
base is written for the Chromium project and is not intended to be used outside it. Using base outside of src.git is explicitly not supported, and base makes no guarantees about API (or even ABI) stability (like all other code in Chromium). New code that depends on base/ must be in src.git. Code that's not in src.git but pulled in through DEPS (for example, v8) cannot use base.
Owners are added when a contributor has shown the above qualifications and when they express interest. There isn't an upper bound on the number of OWNERS.
Since the primitives provided by //base are used very widely, it is important to ensure they scale to the necessary workloads and perform well under all supported platforms. The base_perftests target is a suite of synthetic microbenchmarks that measure performance in various scenarios:
thread_local, the implementation in //base, the POSIX/WinAPI directly)Regressions in these benchmarks can generally by caused by 1) operating system changes, 2) compiler version or flag changes or 3) changes in //base code itself.