Moving function pointer code to Swift 2

Question

rnikander OP

Created Jun ’15

Replies 2

Boosts 0

Participants 3

My sqlite code doesn't compile anymore in Swift 2. The problem lines are this:

let SQLITE_STATIC = sqlite3_destructor_type(COpaquePointer(bitPattern: 0))
let SQLITE_TRANSIENT = sqlite3_destructor_type(COpaquePointer(bitPattern: -1))

Command clicking to Swift's import of sqlite shows this:

typealias sqlite3_destructor_type = (UnsafeMutablePointer<Void>) -> Void

Coming from the following in sqlite3.h:

typedef void (*sqlite3_destructor_type)(void*);
#define SQLITE_STATIC      ((sqlite3_destructor_type)0)
#define SQLITE_TRANSIENT   ((sqlite3_destructor_type)-1)

Anyone know how to create those two constants in Swift 2.0? Even better if there's some way to import sqlite in Swift 2 without this bridging header stuff.

Rob

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Answer 1

MegaWatt OP

Aug ’15

I'm also looking for an answer to this.

0

Answer 2

OOPer OP

Aug ’15

The type should be displayed as:

typealias sqlite3_destructor_type = @convention(c) (UnsafeMutablePointer<Void>) -> Void

(Even in the latest Xcode 7 beta, `@convention(c)` is not displayed in QuickHelp.)

Maybe you need to use unsafeBitCast.

let SQLITE_STATIC = unsafeBitCast(0, sqlite3_destructor_type.self)
let SQLITE_TRANSIENT = unsafeBitCast(-1, sqlite3_destructor_type.self)

0