// https://stackoverflow.com/a/45777692/5536516

import Foundation

struct MemoryAddress<T>: CustomStringConvertible {

    let intValue: Int

    var description: String {
        let length = 2 + 2 * MemoryLayout<UnsafeRawPointer>.size
        return String(format: "%0\(length)p", intValue)
    }

    // for structures
    init(of structPointer: UnsafePointer<T>) {

import lombok.RequiredArgsConstructor;
import lombok.val;
import java.time.Duration;
import java.time.Instant;
import java.util.concurrent.*;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

/**
 * A utility for debouncing function calls.
 */
public class Debouncer<T> {

    private final ScheduledExecutorService executorService;
    private final ConcurrentHashMap<Object, DebouncedTask<T>> buffer = new ConcurrentHashMap<>();
    private final Duration debounceDuration;

import { Component } from '@angular/core';
import { Observable } from 'rxjs';

import { Breadcrumb } from './breadcrumb.model';
import { BreadcrumbService } from './breadcrumb.service';

@Component({
  selector: 'breadcrumb',
  templateUrl: './breadcrumb.component.html',
  styleUrls: ['./breadcrumb.component.scss']
})
export class BreadcrumbComponent {

  breadcrumbs$: Observable<Breadcrumb[]>;

/**
     * 要高效把List<char[]>展开为char[]要注意：
     * 1. 使用Buffer，对应于char的Buffer是CharBuffer
     * 2. 避免使用多次复制
     * 3. 避免字符串转换
     * @param list
     * @return
     */
    char[] flatten(List<char[]> list) {
        //为了高效分配空间，预先计算转换的空间大小
        CharBuffer fullBuffer = CharBuffer.allocate(
                list.stream().mapToInt(array -> array.length).sum());
        list.forEach(fullBuffer::put);
        
        //注意点：CharBuffer.array()返回的是buffer内的数组，避免数据的多次复制。

<script>
import { defineComponent, reactive, toRefs } from "@vue/composition-api";
export default defineComponent({
  setup() {
    const state = reactive({
      dialog: false,
      resolve: null,
      reject: null,
      message: null,
      title: null,
      options: {
        color: "primary",
        width: 290,
        zIndex: 200
      }

package main

import (
	"crypto/tls"
	"crypto/x509"
	"flag"
	"io/ioutil"
	"log"
	"net/http"
)

var (
	certFile = flag.String("cert", "someCertFile", "A PEM eoncoded certificate file.")
	keyFile  = flag.String("key", "someKeyFile", "A PEM encoded private key file.")
	caFile   = flag.String("CA", "someCertCAFile", "A PEM eoncoded CA's certificate file.")