我的应用程序需要一个读/写锁.我读过 https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock
并编写了我自己的类,因为swift中没有读/写锁
class ReadWriteLock {
var logging = true
var b = 0
let r = "vdsbsdbs" // string1 for locking
let g = "VSDBVSDBSDBNSDN" // string2 for locking
func waitAndStartWriting() {
log("wait Writing")
objc_sync_enter(g)
log("enter writing")
}
func finishWriting() {
objc_sync_exit(g)
log("exit writing")
}
// ???? ???? ??? ?????? ?????????? ????? ?????? ??????
// ? ????????? ??????
func waitAndStartReading() {
log("wait reading")
objc_sync_enter(r)
log("enter reading")
b++
if b == 1 {
objc_sync_enter(g)
log("read lock writing")
}
print("b = …我正在尝试将页面内容加载到webview,页面内容引用AngularJS和Angular Material.当我在计算机上的调试中运行它时,它可以通过Android模拟器正常工作.但是当我在智能手机上安装它时,它不起作用.它似乎不知道JavaScript库.非常感谢您的帮助.
MainActivity.cs:
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
var webView = FindViewById<WebView>(Resource.Id.webView);
webView.Settings.JavaScriptEnabled = true;
//webView.Settings.CacheMode = CacheModes.Normal;
webView.Settings.DomStorageEnabled = true;
webView.Settings.SetSupportMultipleWindows(true);
webView.Settings.JavaScriptCanOpenWindowsAutomatically = true;
webView.Settings.AllowContentAccess = true;
webView.Settings.AllowFileAccess = true;
webView.Settings.AllowFileAccessFromFileURLs = true;
// webView.SetWebChromeClient(new WebChromeClient());
webView.SetWebViewClient(new WebViewClient());
webView.LoadUrl("file:///android_asset/Content/List.html");
}
List.html:
<html>
<head>
<title>Angular JS Directive</title>
<link href="https://ajax.googleapis.com/ajax/libs/angular_material/0.9.4/angular-material.min.css" rel="stylesheet"></link>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" rel="stylesheet"></link>
<style type="text/css">
.listdemoListControls md-divider {
margin-top: 10px;
margin-bottom: 10px;
}
.listdemoListControls md-list-item > p, .listdemoListControls …以下代码给我一个错误。
错误：覆盖了'virtual void Animal :: getClass（）'，其中说virtual void getClass（）{cout <<“我是动物” << endl; }
错误：为'virtual int Dog :: getClass（）'指定的返回类型冲突，它说getClass（）{cout <<“我是狗” << endl; }
另外，它说：
“狗”类具有虚拟方法“ getClass”，但非虚拟析构函数
#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include<sstream>
#include <stdlib.h> // srand, rand
#include <stdio.h>
using namespace std;
class Animal{
public:
void getFamily(){ cout << "We are animals " << endl;}
virtual void getClass() { cout << "I'm an animal" << endl; }
};
class Dog : public Animal{
public:
getClass(){ cout << "I'm a …