Question 1

How to parse a custom enum with libenvpp?

Accepted Answer

Use the register_option method with string-to-enum mappings, or specialize default_parser for your enum type. The option variables example shows this with an enum class and custom parser for flexibility.

Question 2

Is libenvpp thread-safe for multi-threaded applications?

Accepted Answer

The core prefix usage is designed for thread safety if handles are managed per-thread, but the global testing environment is explicitly not thread-safe, requiring user synchronization as noted in the testing section.

Question 3

libenvpp vs using std::getenv in C++?

Accepted Answer

libenvpp provides type safety, validation, and error handling, while std::getenv requires manual string parsing and lacks built-in checks. libenvpp is better for robust, maintainable code but adds overhead for simple cases.

Question 4

How to test code that uses libenvpp without modifying system environment?

Accepted Answer

Use scoped_test_environment to inject variables temporarily or set_for_testing to bypass parsing, as detailed in the testing examples, ensuring isolated and reproducible unit tests.

Question 5

Can libenvpp handle environment variables on Windows without issues?

Accepted Answer

Yes, it's platform-independent and handles environment variables consistently across systems, as stated in the features, though custom parsers should account for platform-specific string formats if needed.

Question 6

What's the performance overhead of using libenvpp compared to raw getenv?

Accepted Answer

There's some overhead due to parsing and validation, but it's minimal for most use cases. The library focuses on safety and usability, with performance trade-offs acceptable in configuration-heavy applications.

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