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# Considering Correctness
## Avoid Typeless Interfaces
Bad Idea:
```cpp
std::string find_file(const std::string &base, const std::string &pattern);
```
Better Idea:
```cpp
std::filesystem::path find_file(const std::filesystem::path &base, const std::regex &pattern);
```
The above is better but still suffers from having implicit conversions from `std::string` to `std::filesystem::path` and back.
Consider using a typesafe library like
* https://foonathan.net/type_safe/
* https://github.com/rollbear/strong_type
* https://github.com/joboccara/NamedType
Note that stronger typing can also allow for more compiler optimizations.
* [Sorting in C vs C++](Sorting in C vs C++.pdf)
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