使用未声明的类型AutoreleasingUnsafePointer Xcode 6 beta 6

Question

以下代码给出了编译错误＆＃34;使用未声明的类型AutoreleasingUnsafePointer＆＃34;

    var myString: AutoreleasingUnsafePointer<NSString?>

我是否错过了编译器设置步骤？

由于

Answer 1

如documentation revision history

中所述

  

更新了指针部分，以反映UnsafePointer已替换为UnsafeMutablePointer，ConstUnsafePointer已替换为UnsafePointer，AutoreleasingUnsafePointer已被替换为AutoreleasingUnsafeMutablePointer。

所以你必须使用AutoreleasingUnsafeMutablePointer

Answer 2

我遇到了同样的问题，但是，使用NSError。在新版本的Xcode（6.4）和Swift（以前的版本2）中，必须使用：

#include <iostream>
#include <windows.h>
using namespace std;


int main()
{
    HANDLE screen = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD upPos = {20,28};
    COORD downPos = {50, 0};
    char endState;
    while ( SOMETHING )
    {
      COORD upPos = {20,28};
      COORD downPos = {50, 0};
        while (upPos.Y >=0)
        {
            SetConsoleCursorPosition(screen,upPos);
            cout << "UP" << endl;
            upPos.Y++;

            SetConsoleCursorPosition(screen,upPos);
            cout << "  " << endl;
            upPos.Y -=2;

            SetConsoleCursorPosition(screen,downPos);
            cout << "DOWN" << endl;
            downPos.Y--;

            SetConsoleCursorPosition(screen,downPos);
            cout << "    " << endl;
            downPos.Y+=2;

            Sleep(100);

        }

    }
}