[all-commits] [llvm/llvm-project] d038fa: [clang-tidy] add option performance-move-const-arg...

Greg Miller via All-commits all-commits at lists.llvm.org
Thu Feb 10 05:31:58 PST 2022

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d038faea4608f8f39602fb557666281c49de5722
  Author: Greg Miller <9447643+devjgm at users.noreply.github.com>
  Date:   2022-02-10 (Thu, 10 Feb 2022)

  Changed paths:
    M clang-tools-extra/clang-tidy/performance/MoveConstArgCheck.cpp
    M clang-tools-extra/clang-tidy/performance/MoveConstArgCheck.h
    M clang-tools-extra/docs/clang-tidy/checks/performance-move-const-arg.rst
    A clang-tools-extra/test/clang-tidy/checkers/performance-move-const-arg-const-ref.cpp

  Log Message:
  [clang-tidy] add option performance-move-const-arg.CheckMoveToConstRef

This option allows callers to disable the warning from
that would warn on the following

void f(const string &s);
string s;
f(std::move(s));  // ALLOWED if performance-move-const-arg.CheckMoveToConstRef=false

The reason people might want to disable this check, is because it allows
callers to use `std::move()` or not based on local reasoning about the
argument, and without having to care about how the function `f` accepts
the argument. Indeed, `f` might accept the argument by const-ref today,
but change to by-value tomorrow, and if the caller had moved the
argument that they were finished with, the code would work as
efficiently as possible regardless of how `f` accepted the parameter.

Reviewed By: ymandel

Differential Revision: https://reviews.llvm.org/D119370

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