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The std::expected (C++23) comes with a monadic interface. Relying on the monadic interface prevents the typical if-then-else verbose error checking.

The and_then and or_else methods expect a callable that accepts a value/error and returns a std::expected.

The transform and transform_error methods expect a callable that accepts a value/error and returns a value/error.

Compiler Explorer link: https://compiler-explorer.com/z/WWsd5Y3W3