C++ Idioms and Patterns

To handle expected failures in C++ without exceptions, use `std::expected` (C++23) or result-style types. This approach reserves exceptions for truly exceptional conditions, making error handling predictable and producing maintainable service layer code.

Choose `std::unique_ptr` vs `std::shared_ptr` based on strict ownership requirements: apply RAII principles and the Rule of Zero to manage object lifetime deterministically, selecting unique_ptr for exclusive ownership and shared_ptr only when shared ownership is necessary.

Use `std::string_view` to create allocation-free read-only parameters in C++ interfaces. Combined with `std::optional` and `std::variant`, it clarifies intent and improves type safety across service and library code without unnecessary memory allocations.

The best way to refactor legacy C++ code to modern standards involves enforcing RAII-based patterns, updating ownership with smart pointers, adopting `std::expected`-style result handling, and applying Concepts and Ranges for expressive, type-safe designs across C++17/20/23 codebases.

Yes, applying modern C++ idioms works effectively across both service and library code. Enforcing safe resource management, predictable error handling, and correct interface design ensures deterministic execution and maintainable abstractions in any C++17/20/23 development context.

Use `std::optional` and `std::variant` in C++ APIs to express clear intent for optional values and type-safe alternatives. These modern C++ standard library features eliminate ambiguous pointer states and enable robust, type-safe abstractions in your interface design.