Question 1

How does emio compare to fmtlib for embedded systems?

Accepted Answer

emio is designed specifically for embedded systems with a much smaller binary footprint—about 38 times smaller—and uses result objects instead of exceptions for deterministic error handling. However, fmtlib is more mature and widely adopted, so choose based on priorities between size and ecosystem support.

Question 2

Can emio be used with Arduino?

Accepted Answer

emio can be used with Arduino if the compiler supports C++20, but it's optimized for bare-metal and RTOS systems. Check your Arduino toolchain for C++20 compatibility and ensure the library fits within memory constraints, as it avoids heap usage.

Question 3

How to integrate emio into a CMake project?

Accepted Answer

Use CMake's FetchContent to declare the emio repository and tag, then make it available as shown in the README. Alternatively, download the single header file or use the Conan package for simpler inclusion in your build system.

Question 4

Does emio support floating-point formatting?

Accepted Answer

The README doesn't explicitly detail floating-point support, but given its design for embedded I/O, it likely handles basic types. Refer to the API documentation for specifics on supported data types and formatting options.

Question 5

How to handle errors with emio's result objects?

Accepted Answer

emio functions return result objects that you must check using methods like .value() or .has_value(). Handle errors by inspecting these results, similar to std::expected, to maintain exception-free operation in embedded code.

Question 6

Is emio suitable for real-time operating systems like FreeRTOS?

Accepted Answer

Yes, emio is designed for RTOS-based systems with heap-free operation and deterministic error handling, making it a good fit for real-time environments. However, verify compatibility with your specific RTOS constraints and scheduling requirements.

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