Add bn::base::expected, a backport of C++23's std::expected - #8546
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`bn::base::expected` provides a way to represent either of two values: an expected value of type `T` or an unexpected value of type `E`. This is commonly used as the return type of a function that can fail, where `T` will hold the return value on success and `E` will hold the error on failure. Most functionality of `std::expected` is implemented. The header lists the aspects that were skipped for now.
bdash
added this pull request to stack #8548
September 10, 2026 17:35
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bn::base::expectedprovides a way to represent either of two values: an expected value of typeTor an unexpected value of typeE. This is commonly used as the return type of a function that can fail, whereTwill hold the return value on success andEwill hold the error on failure.Most functionality of
std::expectedis implemented. The header lists the aspects that were skipped for now.Unit tests are on the internal branch of the same name.