Pieter Wuille 1ac1c33f3f [checkqueue] support user-defined return type through std::optional ...

The check type function now needs to return a std::optional<R> for some type R,
and the check queue overall will return std::nullopt if all individual checks
return that, or one of the non-nullopt values if there is at least one.

For most tests, we use R=int, but for the actual validation code, we make it return
the ScriptError.

2024-12-02 16:25:13 -05:00

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