CODEWITHSUNDEEP
swift
Pablo
Pablo

Reputation: 29519

Safe conversion from Unsigned to Signed type

Having 

let finalValueUnsigned64:UInt64

I would like to convert it to Int64

let finalValue = Int64(finalValueUnsigned64)

But the initializers doesn't throw exception so I can handle the situations, when the value is too large and conversion is not possible. How can I convert any Unsigned to Signed, with some feedback whether conversion is possible or not?

Upvotes: 2

Views: 81

Answers (1)

David Rönnqvist
David Rönnqvist

Reputation: 56635

You can use the Int64(exactly:) initializer to check if a value can be converted or not. If the value can't be represented exactly it will return nil. For example:

Int8(exactly: 100)   // Optional(100)
Int8(exactly: 1_000) // nil

Upvotes: 3

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