aaron.ballman added inline comments.
================
Comment at:
clang-tools-extra/clang-tidy/performance/UnnecessaryCopyInitialization.cpp:126
if (OldVar == nullptr) {
+ // Only allow initialization of a const reference from a free function if
it
+ // has no arguments or only default arguments. Otherwise it could return
----------------
I'm not certain I agree with this change, but I'm also not certain I disagree
with it. There are more ways to alias than just default arguments (global
variables, etc) and the presence of a default argument is not really an
indication about its return value in this case. e.g.,
```
const ExpensiveToCopyType &freeFunctionWithDefaultArg(int i = 12);
```
(I don't see a reason why `= 12` should impact whether use of this function
diagnoses or not.)
Perhaps if this was tightened up a bit to care about the type of the default
argument it might make sense, but even that gets tricky when you consider base
classes, template types, etc. and doesn't cover all of the aliasing cases
anyway. Is there an important use case for this behavior?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D87455/new/
https://reviews.llvm.org/D87455
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