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pofat/CustomUnwrapper.swift

Last active December 1, 2016 13:10
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A force unwrapper for Optional type with error hint, suitable for development
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CustomUnwrapper.swift
// This trick is orininally from 'https://boxueio.com/'
infix operator !!
func !!<T>(optional: T?, errorMessage: @autoclosure () -> String) -> T {
if let value = optional { return value }
fatalError(errorMessage)
}
let record = ["foo": "bar"]
// Run it and you will get a run time error with customized message 'Such key does not exist'
record["name"] !! "Such key does not exist"
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