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1月>
25262728293031
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>
            99在线精品视频| 在线亚洲免费| 免费观看成人| 久久先锋影音av| 亚洲日本成人网| 亚洲美女av在线播放| 国产精品久久久| 久久高清国产| 奶水喷射视频一区| 亚洲免费视频一区二区| 午夜视频一区在线观看| 狠狠色狠狠色综合日日tαg| 欧美寡妇偷汉性猛交| 欧美精品二区| 久久精品国产清自在天天线| 每日更新成人在线视频| 一区二区三区精品视频在线观看| 亚洲免费网站| 亚洲精品综合| 欧美一区二区三区四区高清| 亚洲欧洲综合另类在线| 亚洲免费视频一区二区| 亚洲区在线播放| 亚洲欧美日韩一区| 日韩一级欧洲| 久久精品国产96久久久香蕉| 妖精成人www高清在线观看| 午夜免费日韩视频| 一本色道久久88综合亚洲精品ⅰ| 羞羞视频在线观看欧美| 中日韩午夜理伦电影免费| 欧美在线亚洲综合一区| 亚洲一区二区三区视频播放| 久久久久久69| 欧美在线播放视频| 欧美日韩国产小视频在线观看| 老牛国产精品一区的观看方式| 欧美午夜一区二区| 猛男gaygay欧美视频| 国产欧美韩国高清| 99国产精品国产精品毛片| 亚洲国产精品久久| 欧美中在线观看| 羞羞答答国产精品www一本| 欧美日韩精品免费观看视频完整| 免费欧美在线视频| 韩日精品视频| 欧美影院一区| 久久精品72免费观看| 国产精品久久久久久久9999| 亚洲精品美女在线观看| 亚洲第一区中文99精品| 久久精品国产免费观看| 久久久久国产精品人| 国产目拍亚洲精品99久久精品| av成人毛片| 亚洲视频在线观看免费| 欧美日韩精品二区| 亚洲人久久久| 9色精品在线| 欧美久久九九| 99在线热播精品免费| 亚洲图片激情小说| 欧美四级在线| 亚洲一区二区三区免费在线观看| 亚洲一区二区三区精品在线观看| 欧美日韩岛国| 亚洲视频在线观看一区| 午夜精品福利视频| 国产老肥熟一区二区三区| 亚洲视频999| 欧美在线视频免费观看| 国产日韩欧美二区| 久久久美女艺术照精彩视频福利播放| 久久嫩草精品久久久精品| 激情欧美国产欧美| 欧美电影在线观看| 亚洲精品一二三| 午夜亚洲一区| 激情成人av在线| 欧美插天视频在线播放| 99成人精品| 久久精品一区| 亚洲经典三级| 国产精品白丝黑袜喷水久久久| 亚洲欧美日韩精品在线| 欧美成人免费在线视频| 一区二区三区欧美日韩| 国产欧美一区二区精品秋霞影院| 久久国产主播| 亚洲毛片一区| 久久亚洲私人国产精品va| 亚洲欧洲一区二区在线播放 | 亚洲国产高清高潮精品美女| 一本久道久久久| 国产精品一区二区久久精品| 久久夜色精品国产欧美乱| 亚洲精品视频免费观看| 久久精品日韩一区二区三区| 亚洲毛片在线| 国产日本欧美一区二区三区| 欧美成人精品1314www| 亚洲欧洲99久久| 亚洲激情一区二区| 久久久久亚洲综合| 一本一本久久| 亚洲国产成人久久综合一区| 国产精品一区二区男女羞羞无遮挡 | 亚洲一区影院| 亚洲电影av在线| 国产精品欧美精品| 欧美黄色aa电影| 久久精品综合| 亚洲一区日本| 亚洲美女一区| 亚洲国产女人aaa毛片在线| 欧美亚洲免费高清在线观看| 一本色道久久| 亚洲精品久久久蜜桃| 狠狠色综合色区| 国产精品一区久久| 欧美三级韩国三级日本三斤| 欧美成人免费全部| 久久一日本道色综合久久| 亚洲欧美电影在线观看| 一本色道久久综合亚洲精品按摩| 欧美高清在线一区二区| 久久综合亚州| 久久亚洲精品网站| 久久精品主播| 久久久青草婷婷精品综合日韩 | 亚洲欧洲一区| 亚洲国产美女精品久久久久∴| 国产一区二区精品在线观看| 欧美午夜欧美| 国产精品mm| 国产精品普通话对白| 欧美午夜性色大片在线观看| 欧美日韩综合网| 欧美午夜片在线观看| 国产精品久久一级| 国产精品婷婷| 国产一区二区精品久久| 国产亚洲精品自拍| 国语自产精品视频在线看一大j8| 国产欧美一区二区在线观看| 国产免费成人在线视频| 国产一区二区精品丝袜| 一区二区在线视频观看| 亚洲成人在线视频网站| 91久久视频| 亚洲视频二区| 欧美一区二区视频97| 久久久久99| 亚洲国产精品一区在线观看不卡| 亚洲黄一区二区| 99国产精品久久久久久久久久| 亚洲视频视频在线| 欧美一区二区三区在线看| 久久婷婷一区| 欧美日本在线一区| 国产精品露脸自拍| 好吊视频一区二区三区四区| 亚洲国产精品一区二区三区| 99综合电影在线视频| 欧美一区二区三区视频在线| 久久亚洲精品欧美| 亚洲理论在线| 欧美一区日韩一区| 欧美激情视频网站| 国产目拍亚洲精品99久久精品| 在线视频成人| 午夜日本精品| 欧美国产欧美亚洲国产日韩mv天天看完整 | 久久精品国产99国产精品| 欧美大片免费久久精品三p| 日韩午夜精品视频| 久久久91精品国产一区二区精品| 欧美另类高清视频在线| 国产亚洲精品久| 中日韩美女免费视频网站在线观看| 欧美一区国产一区| 91久久久在线| 久久爱91午夜羞羞| 欧美日韩中文字幕精品| 在线日本欧美| 欧美在线看片| 99热在线精品观看| 美女脱光内衣内裤视频久久影院 | 免费亚洲一区二区| 国产视频精品xxxx| 亚洲视屏一区| 亚洲大片在线| 久久久亚洲欧洲日产国码αv| 国产精品久久久久三级| 亚洲毛片在线看| 免费不卡视频| 久久精品亚洲一区二区三区浴池| 欧美午夜电影完整版| 日韩一区二区福利|