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Little bit confused with this code. 

var _ QueryAppender = (*selectQuery)(nil)

I found this code in pg-go repository and don't know why QueryAppender declared that way. Please explain me what is the use cases when I should declare variables that way.

latsha
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1 Answers1

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This doesn't do anything at runtime, but unless the *selectQuery type satisfies the interface QueryAppender, compilation will fail. It's a kind of static assertion.

Paul Hankin
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