Swift原因エラーのRealloc UnsafeMutablePointer

Question

Cのポインタに関するいくつかの操作をSwiftに変換しています。

var bits = UnsafeMutableBufferPointer<Int32>(start: nil, count: 0) 

var startIdx: UnsafeMutablePointer<Int32> = nil { 
    didSet { 
     bits = UnsafeMutableBufferPointer<Int32>(start: startIdx, count: bitsLength) 
     defer { bits.baseAddress.dealloc(bits.count) } 
    } 
} 

var size: Int = 0 
var bitsLength: Int = 1 

init(size: Int) { 
    self.size = size 
    self.bitsLength = (size + 31)/32 
    self.startIdx = UnsafeMutablePointer<Int32>.alloc(bitsLength * sizeof(Int32)) 
} 

func ensureCapacity(size: Int) { 
    if size > bitsLength * 32 { 
     let newBitsLength = (size + 31)/32 

     startIdx = realloc(startIdx, sizeof(Int32) * newBitsLength) 
     // Cannot convert value of type `UnsafeMutablePointer<Int32>` to type 'UnsafeMutablePointer<Void>'(aka `UnsafeMutablePointer<()>`) in coercion 
    } 
} 

私はタイプするタイプUnsafeMutablePointer<Int32>の値を変換できません。この

を得た 'UnsafeMutablePointer'（別名​​）強制

に任意のアイデアを？

Answer 1

んでした。このヘルプ：

startIdx = unsafeBitCast(realloc(startIdx, sizeof(Int32) * newBitsLength), UnsafeMutablePointer<Int32>.self)