| Issue |
160272
|
| Summary |
[clang-tidy] Add option to modernize-use-auto for declarations where the type is known
|
| Labels |
enhancement,
clang-tidy
|
| Assignees |
|
| Reporter |
carlosgalvezp
|
I recently came across [this blog](https://abuehl.github.io/2025/09/17/even-more-auto.html), based on an old CppCon talk by Herb Sutter. There, they suggest applying the following transformation:
```cpp
SomeType x{...};
SomeOtherLongerType y{...};
int z{123};
```
to:
```cpp
auto x = SomeType{...};
auto y = SomeOtherLongerType{...};
auto z = 123;
```
Which I think is quite neat and provides improved readability while still being explicit about the type. As a bonus, this pattern forces variables to be defined at the declaration, reducing the risk for uninitialiezd variables.
It would be nice to have support for this in `modernize-use-auto`, with an option that is possibly off-by-default.
Caveat: if `SomeType` is expensive to copy this may lead to lower performance. In C++17 the copy is guaranteed to be elided, though.
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