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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)
+
+