青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品

隨筆 - 42  文章 - 3  trackbacks - 0
<2012年7月>
24252627282930
1234567
891011121314
15161718192021
22232425262728
2930311234

常用鏈接

留言簿(2)

隨筆檔案

文章檔案

網頁收藏

搜索

  •  

最新評論

閱讀排行榜

評論排行榜

Chapter 4
Some people find the “90/10” rule helpful: 90 percent of the running time of most programs is spent in only
10 percent of the code (Hennessy and Patterson, 2002)

Use a vector instead of an array whenever possible.
Vectors provide fast (constant time) element insertion and deletion at the end of the vector, but slow
(linear time) insertion and deletion anywhere else. Insertion and deletion are slow because the operation
must move all the elements “down” or “up” by one to make room for the new element or to fill the
space left by the deleted element. Like arrays, vectors provide fast (constant time) access to any of their
elements.
You should use a vector in your programs when you need fast access to the elements, but do not plan to
add or remove elements often. A good rule of thumb is to use a vector whenever you would have used
an array.

The name deque is an abbreviation for a double-ended queue. A deque is partway between a vector and a
list, but closer to a vector. Like a vector, it provides quick (constant time) element access. Like a list, it
provides fast (amortized constant time) insertion and deletion at both ends of the sequence. However,
unlike a list, it provides slow (linear time) insertion and deletion in the middle of the sequence.
You should use a deque instead of a vector when you need to insert or remove elements from either end
of the sequence but still need fast access time to all elements. However, this requirement does not apply
to many programming problems; in most cases a vector or queue should suffice.


A set in STL is a collection of elements. Although the mathematical definition of a set implies an
unordered collection, the STL set stores the elements in an ordered fashion so that it can provide reasonably
fast lookup, insertion, and deletion.
Use a set instead of a vector or list if you want equal performance for insertion, deletion,and lookup.
Note that a set does not allow duplication of elements. That is, each element in the set must be unique. If
you want to store duplicate elements, you must use a multiset.


Chapter8
Initializer lists allow initialization of data members at the time of their creation.
An initializer list allows you to provide initial values for data members as they are created, which is more efficient than assigning values to them later.
However, several data types must be initialized in an initializer list. The following table summarizes them:a、 const data members; b、Reference data members C、Object data members or Superclasses without default constructors
Initializer lists initialize data members in their declared order in the class definition,not their order in the list.

Chapter9
Pass objects by const reference instead of by value.
The default semantics for passing arguments to functions in C++ is pass-by-value. That means that the function or method receives a copy of the variable, not the variable itself. Thus, whenever you pass an object to a function or method the compiler calls the copy constructor of the new object to initialize it. The copy constructor is also called whenever you return an object from a function or method.
posted on 2012-07-09 19:41 鷹擊長空 閱讀(437) 評論(0)  編輯 收藏 引用
青青草原综合久久大伊人导航_色综合久久天天综合_日日噜噜夜夜狠狠久久丁香五月_热久久这里只有精品
  • <ins id="pjuwb"></ins>
    <blockquote id="pjuwb"><pre id="pjuwb"></pre></blockquote>
    <noscript id="pjuwb"></noscript>
          <sup id="pjuwb"><pre id="pjuwb"></pre></sup>
            <dd id="pjuwb"></dd>
            <abbr id="pjuwb"></abbr>
            久久永久免费| 欧美影院久久久| 欧美国产专区| 欧美国产欧美亚州国产日韩mv天天看完整| 黄色一区二区在线观看| 欧美va亚洲va国产综合| 欧美黑人一区二区三区| 亚洲香蕉成视频在线观看| 亚洲视频在线一区观看| 国产主播精品| 亚洲国产成人精品视频| 欧美日韩系列| 欧美中日韩免费视频| 葵司免费一区二区三区四区五区| 亚洲欧洲日产国码二区| 99国产精品久久久| 国产亚洲激情在线| 亚洲黄色在线| 国产午夜精品一区理论片飘花 | 欧美国产精品v| 欧美日韩国产免费观看| 欧美在线影院| 欧美日韩和欧美的一区二区| 欧美专区在线观看一区| 欧美高清在线视频观看不卡| 午夜综合激情| 欧美黄色日本| 久久综合色播五月| 欧美丝袜一区二区| 欧美不卡三区| 国产片一区二区| 99re热精品| 亚洲日本国产| 欧美在线资源| 午夜亚洲福利在线老司机| 欧美69视频| 另类尿喷潮videofree| 国产精品都在这里| 亚洲精品国精品久久99热| 国内一区二区三区在线视频| 99视频精品在线| 亚洲人成网站在线播| 久久9热精品视频| 午夜精品亚洲一区二区三区嫩草| 欧美国产国产综合| 免费在线亚洲| 在线国产精品播放| 香蕉久久国产| 亚洲欧美日韩国产中文在线| 欧美日韩视频第一区| 亚洲国产专区| 亚洲欧洲在线视频| 男人的天堂亚洲在线| 久久午夜视频| 精品不卡视频| 久久激情视频久久| 久久蜜桃精品| 狠狠色丁香婷综合久久| 欧美在线观看一区| 久久久久久999| 国产亚洲欧美一区在线观看| 午夜久久影院| 久久精品国产成人| 国产亚洲欧洲997久久综合| 香蕉久久夜色精品国产| 久久成人久久爱| 国产三级精品三级| 久久精品99| 欧美成人自拍| 99精品久久| 欧美日韩免费高清一区色橹橹| 亚洲美女少妇无套啪啪呻吟| 一本久久综合亚洲鲁鲁| 欧美亚男人的天堂| 欧美一区二区免费| 久久综合综合久久综合| 亚洲第一页在线| 欧美精品午夜| 亚洲特色特黄| 久久久人成影片一区二区三区观看| 在线观看国产成人av片| 欧美成人精品一区二区三区| 亚洲人成人99网站| 亚洲欧美偷拍卡通变态| 国产午夜亚洲精品不卡| 蜜臀av性久久久久蜜臀aⅴ四虎 | 久久av资源网站| 在线精品视频一区二区三四| 欧美成人一区二区三区在线观看| 99re6这里只有精品| 欧美专区在线播放| 亚洲精品乱码久久久久久久久| 欧美午夜www高清视频| 欧美一区二区三区四区视频| 亚洲电影在线| 欧美一区午夜精品| 亚洲美女网站| 国产精品一区二区黑丝| 欧美成人情趣视频| 亚洲一区二区久久| 亚洲第一福利在线观看| 亚洲欧洲av一区二区三区久久| 国产亚洲欧美一区二区| 欧美精品在线一区二区| 久久高清福利视频| 夜夜嗨av一区二区三区免费区| 久久久91精品| 亚洲午夜电影网| 最新中文字幕亚洲| 国产日产欧产精品推荐色 | 亚洲高清资源综合久久精品| 香蕉国产精品偷在线观看不卡| 亚洲国产欧美在线| 国产视频一区免费看| 欧美日韩精品免费观看视频| 久久人体大胆视频| 亚洲欧美日韩国产中文 | 久久久综合网站| 亚洲综合电影| 亚洲另类自拍| 在线观看免费视频综合| 国产精品一区2区| 欧美日韩岛国| 欧美激情亚洲视频| 狂野欧美一区| 久久久久久97三级| 欧美亚洲网站| 午夜精品久久| 亚洲欧美日韩精品久久亚洲区| 日韩视频专区| 亚洲精品在线看| 亚洲国产专区校园欧美| 欧美福利精品| 欧美高清视频| 欧美激情导航| 亚洲国产高潮在线观看| 欧美激情久久久久| 欧美国产日韩一区二区三区| 免费视频一区| 欧美黄色小视频| 亚洲高清三级视频| 亚洲国产精品久久久久秋霞不卡| 欧美v日韩v国产v| 免费毛片一区二区三区久久久| 久久天天躁狠狠躁夜夜爽蜜月| 久久欧美肥婆一二区| 久久日韩粉嫩一区二区三区| 久久久久久国产精品一区| 久久久久久电影| 美女脱光内衣内裤视频久久影院 | 欧美成人午夜77777| 欧美风情在线观看| 欧美久久电影| 国产精品国产三级国产专播品爱网| 欧美日韩国产片| 国产精品国产三级国产| 国产精品一区二区三区久久| 国产日产欧产精品推荐色| 国产专区欧美专区| 亚洲人成在线观看一区二区| 一区二区三区日韩| 欧美一二区视频| 欧美国产成人在线| 99精品视频免费| 欧美一区91| 免费亚洲一区| 国产精品高潮呻吟| 激情国产一区二区| 一本色道久久加勒比88综合| 性久久久久久久久| 欧美国产高清| 亚洲影视综合| 男人的天堂亚洲| 国产精品视频一二三| 亚洲成人在线网站| 亚洲网站视频福利| 久久亚洲一区二区| 亚洲精品欧美日韩专区| 先锋资源久久| 欧美人与性动交cc0o| 国内成人精品一区| 亚洲视频免费在线| 久久综合一区| 亚洲一级黄色av| 欧美福利视频| 国产视频一区在线| 一本色道久久99精品综合| 久久久欧美一区二区| 亚洲最新在线| 欧美成人一区二区| 国语自产精品视频在线看抢先版结局 | 裸体歌舞表演一区二区| 国产精品午夜视频| 日韩视频在线观看免费| 久久嫩草精品久久久久| 亚洲视频你懂的| 女女同性精品视频| 激情综合自拍| 久久精品人人做人人爽| 一区二区欧美精品|