pgpin | Example of a database-backed service in Go | Database library
kandi X-RAY | pgpin Summary
kandi X-RAY | pgpin Summary
pgpin is an open-source example app showing how to build a database-backed service in Go. The example is a clone of Heroku Dataclips, basically a "pastebin for SQL queries".
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Top functions reviewed by kandi - BETA
- parseTs parses string to date .
- Open opens a connection to the named database .
- parseOpts parses connection options .
- ScanSlice converts src to dest .
- run runs http . Server .
- Convert d into d .
- parseEnviron takes a list of environment variables and returns a map .
- compileStructSpec builds a structSpec for t .
- squashOnRegex selects a regular expression from a regular expression and returns it .
- WorkerQuery executes a pin query
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QUESTION
I have two classes, say 'Base
' and 'Derived
', where Derived
class inherits Base
class.
Then a container of references to Derived class instances (std::vector< std::reference_wrapper< Derived > > myContainer
).
And finally, I have a function that takes std::vector< std::reference_wrapper< Base > >
as argument.
If I pass the container(myContainer) to the function, it doesn't compile:
If I change my container to hold references to Base, everything works fine and since it is a reference_wrapper, I believe, I will still have the polymorphic behaviour that I need. But this feels unclean as I am sure that my container will not hold anything other than Derived instances.
At the same time, the function that takes in the vector is supposed to work on both Derived and Base classes.
Minimal code:
...ANSWER
Answered 2019-Oct-11 at 13:25That's just not possible:
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