rust源碼

Ⅰ 為什麼 node.js 的版本號更新得那麼快

Node.js生態很活躍的啊，為什麼就這么難招人？JavaScript語言規范都到2017了，Node.js版本也到v7.7了，正是無數專家學者，大公司，小公司和個人共同在推進這個開放的生態。Teambition作為一個創業公司，基於Node.js構建了我們的後端體系。我們從這個生態中受益良多，也在努力回饋這個生態。Node.js也很容易學啊，為什麼就這么難招人？JS包括Node.js很容易學成上手。遙想12年時我就從零學起，半年時間就用Node.js和AngularJS做出了一套開源社區系統，至今還在運行。一般認為寫Node.js的都是從前端轉的，或者是後端新人，後端老手應該是不屑於Node.js的，這點我也認同。我本人前端、後端、JS、Golang、Rust都有寫，目前主要在用Golang寫後端，Node.js相關的項目也在繼續推進。Node.js的優點是容易學容易出成果，因為它的開源生態好，很多東西拿來即用，想深入學習則直接看項目源碼造輪子。缺點就是當項目足夠龐大足夠復雜了不太好維護。所以我認為Node.js是一門非常好的後端入門語言，也非常適合用來開發輕量級的應用服務。

Ⅱ 為何區塊鏈被稱為繼互聯網之後偉大的發明

區塊鏈的發明是迎合宇宙空間揚升大趨勢的需要。是提升國家和人民的訴求。是互聯互通互學互助組網的基本結構性的點的需要。加上線性的需要，金字塔的立體化的需要，（宇宙空間三需要）！區塊鏈是一個需要。一個基本點的需要。

Ⅲ 我為什麼要選擇Rust

你好，很高興為你解答。
專訪資深程序員庄曉立：我為什麼要選擇Rust？
Rust是由Mozilla開發的注重安全、性能和並發性的編程語言。這門語言自推出以來就得到了國內外程序員的大力推崇。Rust聲稱解決了傳統C語言和C++語言幾十年來飽受責難的內存安全問題，同時還保持了極高的運行效率、極深的底層控制、極廣的應用范圍。但在國內有關Rust的學習文檔並不多見，不久前，筆者聯繫上了Rust1.0版本代碼貢獻者庄曉立（精彩博文：為什麼我說Rust是靠譜的編程語言），請他分享Rust語言特性以及學習經驗。
CSDN：你是從什麼時候開始接觸Rust語言的？是什麼地方吸引了你？

庄曉立：我大概從2013年後半年開始深入接觸Rust語言。它居然聲稱解決了傳統C語言和C++語言幾十年來飽受責難的內存安全問題，同時還保持了極高的運行效率、極深的底層控制、極廣的應用范圍。

其ownership機制令人眼前一亮，無虛擬機（VM）、無垃圾收集器（GC）、無運行時（Runtime）、無空指針/野指針/內存越界/緩沖區溢出/段錯誤、無數據競爭（Data Race）……所有這些，都深深地吸引了我——這個十多年以來深受C語言折磨的痛並快樂著的程序員。

CSDN：在你看來，Rust是怎樣的一門語言？它適合開發什麼類型的項目？為何你會說Rust不懼怕任何競爭對手，它既能取代C語言地位；又可挑戰C++市場，還可向Java、Python分一杯羹？與這些語言相比，Rust有哪些優越的特性？

庄曉立：Rust是一門系統編程語言，特別適合開發對CPU和內存佔用十分敏感的系統軟體，例如虛擬機（VM）、容器（Container）、資料庫/游戲/網路伺服器、瀏覽器引擎、模擬器等，而這些向來主要都是C/C++的傳統領地。

此外，Rust在系統底層開發領域，如裸金屬（bare metal）、操作系統（OS）、內核（kernel）、內核模塊（mod）等，也有強勁的實力，足以挑戰此領域的傳統老大C語言。Rust豐富的語言特性、先進的設計理念、便捷的項目管理，令它在上層應用開發中也能大展拳腳，至少在運行性能上比帶VM和GC的語言要更勝一籌。無GC實現內存安全機制、無數據競爭的並發機制、無運行時開銷的抽象機制，是Rust獨特的優越特性。

其他語言很難同時實現這些目標，例如傳統C/C++無法保證內存安全，Java/Python等無法消除運行時開銷。但Rust畢竟還是很年輕的項目，它釋放影響力需要時間，被世人廣泛接受需要時間；它的潛力能否爆發出來，需要時間去檢驗。我們只需耐心等待。

CSDN：Rust在國內有沒有具體的實際使用案例？

庄曉立：因為Rust1.0正式版剛剛發布不足一月，在國內影響力還不大，我們不能苛求它在國內有實際應用案例。但是在國外，一兩年前就已經有OpenDNS和Skylight把Rust應用在生產環境。還有瀏覽器引擎Servo、Rust編譯器和標准庫、項目管理器Cargo等「兩個半大型應用案例」。這些足夠說明Rust語言的成熟和實用。

CSDN：你參與了Rust1.0版本代碼貢獻，目前該版本正式版已經發布，對此你感覺如何？這門語言是否已經達到比較成熟的階段？

庄曉立：我積極參與了Rust語言開源項目，多次貢獻源代碼，曾連續三次出現在Rust官方博客公布的Rust 1.0 alpha、Rust 1.0 beta和Rust 1.0正式版的貢獻者名單中。在Rust 1.0正式版出台的過程中及此前的很長一段時間，開發者付出了極大的努力，確保Rust 1.0正式版在Semver 2.0規范下，務必保持向後兼容性，除非遇到重大Bug不得不修復。

我認為，在1.0正式發布之後，Rust就已經進入了比較成熟的階段。而且，Rust還在快速迭代發展過程中，1.0發布6周後將發布1.1，再6周後將發布1.2，必然會一步一個台階，越來越成熟穩定。

CSDN：除了功能優先順序以外，在你看來，Rust正在朝什麼方向發展？未來的Rust可以期待什麼樣的特性？

庄曉立：Rust一定會沿著「確保內存安全、無運行開銷、高效實用」的既定方向持續發展。在短期內值得期待的語言特性有：動態Drop、偏特化、繼承、改進borrow checker、改進宏和語法擴展。短期內值得期待的其他特性有：增強文件系統API、提供內存申請釋放API、更好地支持Windows和ARM、更快的編譯速度、更方便的二進制分發機制（MUSL）、更實用的工具等等。

CSDN：據我了解，你之前也比較推崇Go語言，為何想到放棄Go轉向Rust？

庄曉立：推崇Go語言還談不上，不過我曾經嘗試努力接受Go語言，2011底年開始我曾經花費將近半年時間深度關注Go開發進程，提了很多具體的改進意見和建議，也曾經多次嘗試貢獻源代碼。後來考慮到Go語言的設計理念跟我偏差太大，其社區也不太友好，慢慢地疏遠了它。我曾經寫過一篇博客《我為什麼放棄Go語言》，談到了很多具體的原因。

CSDN：國內，參與Rust代碼貢獻的開發者多嗎？有核心的人員嗎？有哪些社區在維護Rust？

庄曉立：國內參與Rust代碼貢獻的開發者並不多，但也不少，官方的貢獻者名單中也偶見幾個貌似國人的名字。Rust的核心開發人員基本上都是Mozilla公司的員工，他們專職負責開發維護Rust語言和相關的項目，Rust社區也主要是他們參與組織和管理的。社區人員討論主要集中在GitHub項目主頁RFC/PR/Issue官方、Discuss論壇/IRC、Reddit、HN、StackOverflow等。

Ⅳ 源碼安裝的rust，怎麼設置RUST

為什麼不用 rustup 呢？多方便的工具啊。
你自己下載的話，自己去下源碼包啊，或者 git clone。怎樣都行，反正把源碼拿到，然後把 RUST_SRC_PATH 變數設置過去就可以了。

Ⅳ Money spent on the brain is never spent in vain.

1,智力投資絕不會白花
英語名人名言- 美文賞析- 英語學習- 破釜沉舟: 源碼下載,素材下載,為 ...
http://www.7880.com/Info/Article-edd8ac0.html

2,智力投資，決非虛擲。
東北電力大學第二頻道BBS[舊版] :: 閱讀主題- [分享]英文成語大全 ...
http://www2.ne.e.cn/forum/viewtopic.php?t=25386

3,用於教育的錢絕不是虛擲.
每日一句
http://www.lifesci.snnu.e.cn/s/html/2005-07/265.htm

4,智力上的投資絕非浪費。
LCES READER EZ GO | 名人諺語嘉言錄PartM
http://sctlog.sctnet.e.tw/post/372/3793

你的作文：

Money spent on the brain is never spent in vain.

A number of thoughts concerning money from Charles Spurgeon. These thoughts have been taken from a number of his works.
The fourth evil is one to which I call your very earnest attention, the growth of wickedness in the land, especially in two forms, which we ought not to overlook. One is, the growing worldliness among professing Christians. They are inlging in extravagance in many ways; in luxurious habits, dress, equipages, feastings, and so on, and wasting the substance of which they are stewards. When a man is giving liberally to the cause of God, I count it very foolish to forbid his spending liberally in other ways, for men usually spend by scale. It would be absurd to hold up a wretched miser, who gives nothing either to God or man, as an example to a liberal spender; but there is too much of ostentatious extravagance abroad, which wastes the Master』s money in worldly pleasures and doubtful amusements, yea, and amusements worse than doubtful. Some, who are called ministers of Christ, have in these days even defended amusements which .moralists have felt bound to abandon, but let us hope that such ministers will not repeat the mistake. We must be careful, wise, and yet decided in our dealings with this growing evil, or we shall lose all spirituality from the churches. (An All Around Ministry: Addresses to Ministers and Students, (Page 68))
Every child of God is where God has placed him for some purpose, and the practical use of this first point is to lead you to inquire for what practical purpose has God placed each one of you where you now are? You have been wishing for another position where you could do something for Jesus: do not wish anything of the kind, but serve him where you are. If you are sitting at the King』s gate there is something for you to do there, and if you were on the queen』s throne, there would be something for you to do there; do not ask either to be gatekeeper or queen, but whichever you are, serve God therein. Brother, are you rich? God has made you a steward, take care that you are a good steward. Brother, are you poor? God has thrown you into a position where you will be the better able to give a word of sympathy to poor saints. Are you doing your allotted work? Do you live in a godly family? God has a motive for placing you in so happy a position. Are you in an ungodly house? You are a lamp hung up in a dark place; mind you shine there. Esther did well, because she acted as an Esther should, and Mordecai did well, because he acted as a Mordecai should. I like to think, as I look over you all,-God has put each one of them in the right place, even as a good captain well arranges the different parts of his army, and though we do not know his plan of battle, it will be seen ring the conflict that he has placed teach soldier where he should be. Our wisdom is not to desire another place, nor to judge those who are in another position, but each one being redeemed with the precious blood of Jesus, should consecrate himself fully to the Lord, and say, 「Lord, what would thou have tine to do, for here I am, and by thy grace I am ready to do it.」 Forget not then the fact that God in his providence places his servants in positions where he can make use of them.
God』s work is like a net of many meshes, and these are all connected with each other. We are links of the same chain, and cannot move without moving others. We are members of one body, and God acts towards us with that fact in view. He does not bless the hand for the hand』s sake, but for the sake of the whole body. Well then, dear friend, you are saved that you may save; you are taught that you may teach; you are confirmed in the faith that you may confirm others; talents are allotted to you that you may turn them over and bring in heavenly usury for your Lord. Whatever you nave is yours not to hoard for yourself, or to spend upon yourself, but that you may use it as a good steward of God. Who knoweth whether thou art come to the kingdom which God has given thee for such a time as this, when there is need of thee and all that thou hast?
Next, notice that the servants of God--whether called ministers or not,- those who are really so, are stewards because they are under the Master』s near command. An ordinary servant in God』s house may take his orders from the steward, but the steward takes no order from anybody but the Master; and hence, he is in an evil case, and the household is in an evil case, too, if he does not often resort to the Master, if he does not distinctly recognize his position as an underling of his Master, and if he does not so keep up his daily fellowship with the Master that he himself knows the Master』s mind, and is able to communicate it to his fellow-servants.
The real steward is one who has been appointed to the position; and if he is not appointed, why, he has no right to be a steward at all! Things go right when there is no absentee landlord, but when the great Master is always close at hand, and the steward constantly goes to him with an account of all his work. The steward keeps his master』s stores, and sees that they are not wasted; but he takes care also to magnify his master』s liberality by seeing that none of the household know any want. I have known some who pretended to be stewards of Christ who evidently did not understand the business.
First, give an account of the stewardship of thy time. How hast thou spent it? Have not many hours been allowed to run to waste, or worse than waste, in frivolity and sin? Hast thou lived as a dying man should live? Hast thou employed thine hours as remembering that they are very few, and more precious than the diamonds in an emperor』s crown? What about thy time? Has there not been much of it spent in indolence, in frothy talk, or that did not minister to edification? Thou needest not accuse thyself for time spent in lawful recreation that may sustain thy body, and fit it better for the Lord』s service.
But, after all, to every man, whether he be rich, or whether he be in the office of the ministry, there may be a close of his stewardship before he dies. The mother has her little children swept away one after another; this is the message to her, 「Thou mayest be no longer steward.」 The teacher has his class scattered, or he is himself unable to go to the school; the word to him also is, 「Thou mayest be no longer steward.」 The man who went to his work, who might have spoken to his fellow-workman, is removed, perhaps to another land, or he is placed in a position where his mouth is shut; now he can be no longer steward. Use all opportunities while you have them, catch them on the wing, serve God while you can today! today! today! today! Let each golden moment have its pressing service rendered unto God, lest it should be said to thee, 「Thou mayest be no longer steward.」
Now, as Peter found this prayer so suitable for him, I commend it to each one of you. Have; you been growing rich lately? Then, you will be tempted to become proud and worldly; so pray, 「Lord, save me from the evils that, so often go, with riches; thou art giving me this wealth, help me to be a good steward of it, and not to make, an idol of it.」 Or are you getting poor? Is your business proving a failure? Are your little savings almost gone? Well, there are perils connected with poverty; so pray, 「Lord, save me from becoming envious or discontented; let me be willing to be poor rather than do anything wrong in order to get money.」
First, a steward is a servant, and no more. Perhaps he does not always remember this; and it is a very pitiful Business when the servant begins to think that he is 「my lord.」 It is a pity that servants when honored by their master should be so apt to give themselves airs. How ridiculous Jack-inoffice makes himself! I do not refer now to butlers and footmen, but to ourselves. If we magnify ourselves, we shall become contemptible, and we shall neither magnify our office nor our Lord. We are the servants of Christ, and not lords over his heritage.
My friend, keep money in thy purse: 「It is one of Solomon』s proverbs,」 said one; another answered that it was not there. 「Then,」 said Kit Lancaster, 「it might have been, and if Solomon had ever known the miss of a shilling he would have said it seven times over.」 I think that he does say as much as this in substance, if not in so many words, especially when he talks about the ant; but be that how it may, be sure of this, that a pound in the pocket is as good as a friend at court, and rather better; and if ever you live to want what you once wasted, it will fill you with woe enough to last you to your grave. He who put a pound of butter on a gridiron, not only lost his butter, but made such a blaze as he won』t soon forget: foolish lavishness leads to dreadful wickedness, so John Ploughman begs all his mates to fight shy of it, and post off to the Post Office Savings』 Bank. 「For age and want save while you may; No morning』s sun lasts all the day.」 Money is not the chief thing, it is as far below the grace of God and faith in Christ as a ploughed field is below the stars; but still, godliness hath the promise of the life that now is; as well as of that which is to come, and he who is wise enough to seek first the kingdom of God and his righteousness, should also be wise enough to use aright the other things which God is pleased to add unto him.
「Blessed shall be thy basket and thy store」 Deuteronomy 28:5 Obedience brings a blessing on all the provisions which our instry earns for us. That which comes in and goes out at once, like fruit in the basket which is for immediate use, shall be blest; and that which is laid by with us for a longer season shall equally receive a blessing. Perhaps ours is a handbasket portion. We have a little for breakfast, and a scanty bite for dinner in a basket when we go out to do our work in the morning. This is well, for the blessing of God is promised to the basket. If we live from hand to mouth, getting each day』s supply in the day, we are as well off as Israel; for when the Lord entertained His favored people He Only gave them a day』s manna at a time. What more did they need? What more do we need? But if we have a store, how much we need the Lord to bless it! For there is the care of getting, the care of keeping, the care of managing, the care of using; and, unless the Lord bless it, these cares will eat into our hearts, till our goods become our gods, and our cares prove cankers. O Lord, bless our substance. Enable us to use it for thy glory. Help us to keep worldly things in their proper places, and never may our savings endanger the saving of our souls.
Don』t put all your eggs into one basket. It is unwise to risk all that you have in any one concern. If you have any savings, put them in several places. The marine form of this saying is: 「Do not ship all your goods in one vessel.」
Many can get money; few can use it well. Even to keep it is not easy. Many of the silliest investments have been made by men who, in their own business, were shrewd to the highest degree. It is harder to weave than to gather wool.
Many save their silver, but lose their souls. Many a man』s soul has been ruined by his great love of money, although he had but little money to love.
Money borrowed is soon sorrowed. He that lends it begins to sorrow, even if the borrower does not; for, in general, he may mourn that he has parted from it to meet no more.
Money burns many. They are injured by their wealth. Some by bribes are burned; for when money』s taken, Freedom』s forsaken.
Money calls, but does not stay; It is round and rolls away. It makes the mill to go, but it goes faster than the mill-wheel. It is no more to be kept in the purse than snow in an oven; at least, so I find it. But why should we wish it to stay? It is the circulating medium! why should we detain it? If it rests it rusts. Let it go about doing good.
Money gained on Sabbath-day is a loss, I dare to say. No blessing can come with that which comes to us, on the devil』s back, by our willful disobedience of God』s law. The loss of health by neglect of rest, and the loss of soul by neglect of hearing the gospel, soon turn all seeming profit into real loss.
Money gilds over guilt. Money is said to be a composition for taking out stains in character; but, in that capacity, it is a failure. Those characters which can be thus gilded must surely be of the gingerbread order.
Money has no blood relations. There is no friendship in business. Sad that this should be a proverb in any land, but so it is. The Chinese say: 「Though brothers are closely akin, it is each for himself in money matters.」 They also say: 「Top and bottom teeth sometimes come into awkward collision.」 So little power has relationship in the savage customs of business that, in some instances, one hand would skin the other, if it could make a profit by it.
Money is a good servant, but a bad master. Even as a servant it is not easy to keep it in e subordination. If 「money makes dogs dance,」 it makes men proud. If we make money our god, it will rule us like the devil.
Money is often lost for want of money. It is so when men cannot get their rights, from inability to pay legal charges. Yet if one had plenty of cash, it would not be wise to throw away good money after bad, Money is the best t to fish for man with. He bites greedily at a gold or silver t: but is the creature which is thus taken worth the catching? He who can be bought, I think is worth nought.
Money is the servant of the wise, and the master of fools. Money makes money. The goose that lays the golden eggs likes to lay where there are eggs already; perhaps because it is a goose. The lard comes to the fat; hog. Capital grows by interest, or by wise use it brings in profit, and thus increases.
Money is money』s brother. 「If riches increase, set not your heart upon them.」 — Psalm 62:10. Money makes the mare to go and the dog to dance. Pecuniae obediunt omnia.」 All things obey money.」 This saying comes from the Latin, but it is true in English. A little palm oil will gain entrance where nothing else will do it. Officials are greatly mollified when their hands are, crossed with silver. In a more allowable sense, a good wife would be happier and more active if her allowance could be increased. If she has too little money to keep house upon, it takes the 「go」 out of her. Money often unmakes the men who make it. It has a defiling and degrading power over the mind which thinks too much of it. 「Money and men a mutual falsehood show; Men make false money; money makes men so.」
Money speaks more powerfully than eloquence. Too often, because the speaker is a rich man he commands attention, and secures the approbation of persons who see no sound sense spoken by one who has no money bags. This is very well put in the following verse: — The man of means is eloquent: Brave, handsome, noble, wise; All qualities with gold are, sent, And vanish where it flies.
Money spent on the brain is never spent in vain. Pour your money into your brain, and you will never lose it all. Ecation is such a gain, that it is worth all that it costs, and more. Yet some fellows learn nothing in the schools. Many a father, when his son returns from the University, might say, 「I put in gold into the furnace, and there came out this calf.」
Money will make the pot boil, though the devil should pour water on the fire. But such fuel is not to be depended on. We need something better than mere money to keep our pot a-boiling. Such boiling is apt to scald a man sooner or later.
Money wins where merit fails. It is a pity it should be so; but, with worldly minds, to be rich is to be good. This vulgar error is long in dying. 「The boy in yellow wins the day.」 Canaries are still the favorite birds.
A hammer of gold will not open the gate of heaven. Money opens many of the gates of earth, for bribery is rife; but it has no power in the world to come. Money is more eloquent than ten members of parliament, but it cannot prevail with the Great Judge.
Better a purse empty than full of other men』s money. Gaining riches by chicanery is drawing down a curse upon ourselves. Honorable poverty is infinitely to be preferred to dishonest wealth, or to large indebtedness. In the Telugu we read: 「A cupful of rice-water without debt is enough.」

Do good with your money, or it will do you no good. There is no power in it of itself to do real good to you. It may even do you evil; but, if used for God and his cause, and the poor, it will bless yourself.

總參考：

http://www.google.com/search?num=50&hl=zh-CN&newwindow=1&q=Money+spent+on+the+brain+is+never+spent+in+vain.&lr=

Ⅵ 玉溪電腦培訓學校告訴你C語言編程技術的優勢和劣勢

隨著互聯網編程技術的不斷發展，現在大多數的軟體開發都是通過編程語言來實現的，今天我們就一起來了解一下C語言編程開發技術都有哪些優勢和劣勢。

C語言的一些好的體驗

一次通過閱讀POV-Ray源代碼學會如何在C語言中實現面向對象編程。

通過閱讀GTK+源代碼了解C語言代碼的清晰、干凈和可維護性。

通過閱讀SIOD和Guile的源代碼，知道如何使用C語言實現Scheme解析器。

使用C語言寫出GNOMEEye的初始版本，並對MicroTile渲染進行調優。

C語言的一些不好的體驗

在Evolution團隊時，很多東西老是崩潰。那個時候還沒有Valgrind，為了得到Purify這個軟體，需要購買一台Solaris機器。

調試gnome-vfs線程死鎖問題。

調試Mesa，卻無果。

接手Nautilus-share的初始版本，卻發現代碼裡面居然沒有使用free()。

想要重構代碼，卻不知道該如何管理好內存。

想要打包代碼，卻發現到處是全局變數，而且沒有靜態函數。

但不管怎樣，還是來說說那些Rust里有但C語言里沒有的東西吧。

自動資源管理

Rust從C++那裡借鑒了一些想法，如RAII(，資源獲取即初始化)和智能指針，並加入了值的單一所有權原則，還提供了自動化的決策性資源管理機制。

自動化：不需要手動調用free()。內存使用完後會自動釋放，文件使用完後會自動關閉，互斥鎖在作用域之外會自動釋放。如果要封裝外部資源，基本上只要實現Drop這個trait就可以了。封裝過的資源就像是編程語言的一部分，因為你不需要去管理它的生命周期。

決策性：資源被創建(內存分配、初始化、打開文件等)，然後在作用域之外被銷毀。根本不存在垃圾收集這回事：代碼執行完就都結束了。程序數據的生命周期看起來就像是函數調用樹。

如果在寫代碼時老是忘記調用這些方法(free/close/destroy)，或者發現以前寫的代碼已經忘記調用，甚至錯誤地調用，那麼以後我再也不想使用這些方法了。

泛型

Vec真的就是元素T的vector，而不只是對象指針的數組。在經過編譯之後，它只能用來存放類型T的對象。

在C語言里需要些很多代碼才能實現類似的功能，所以我不想再這么幹了。

trait不只是interface

Rust並不是一門類似那樣的面向對象編程語言，它有trait，看起來就像是里的interface——可以用來實現動態綁定。如果一個對象實現了Drawable，那麼就可以肯定該對象帶有draw()方法。

不過不管怎樣，trait的威力可不止這些。

依賴管理

以前實現依賴管理需要：

手動調用或通過自動化工具宏來調用g-config。

指定頭文件和庫文件路徑。

基本上需要人為確保安裝了正確版本的庫文件。

而在Rust里，只需要編寫一個Cargo.toml文件，然後在文件里指明依賴庫的版本。這些依賴庫會被自動下載下來，或者從某個指定的地方獲取。

測試

C語言的單元測試非常困難，原因如下：

內部函數通常都是靜態的。也就是說，它們無法被外部文件調用。測試程序需要使用#include指令把源文件包含進來，或者使用#ifdefs在測試過程中移除這些靜態函數。

需要編寫Makefile文件將測試程序鏈接到其中的部分依賴庫或部分代碼。

需要使用測試框架，並把測試用例注冊到框架上，還要學會如何使用這些框架。

衛生宏(HygienicMacro)

Rust的衛生宏避免了C語言宏可能存在的問題，比如宏中的一些東西會掩蓋掉代碼里的標識符。Rust並不要求宏中所有的符號都必須使用括弧，比如max(5+3,4)。

沒有自動轉型

在C語言里，玉溪北大青鳥http://www.kmbdqn.cn/發現很多bug都是因為在無意中將int轉成short或char而導致，而在Rust里就不會出現這種情況，因為它要求顯示轉型。

不會出現整型溢出

這個就不用再多作解釋了。

Ⅶ windows 7 下Rust 入門 Helloworld 怎麼編寫

方法/步驟
1、首先要在 電腦上安裝 rust 語言，具體可參考
0windows7怎麼安裝 rust
2、打開一個編輯器，我用的是 Notepad ++ ，其他也可以，建議初學 最好用 文本編輯器，不要用什麼IDE
3、輸入代碼：
// This is a comment, and will be ignored by the compiler
// 本行為注釋，會被編譯器忽略
// This is the main function
// 這是主函數
fn main() {

println!("Hello World!");
}
windows 7 下Rust 入門 Helloworld 怎麼編寫
4、輸入無誤後，保存為 "hello.rs", 注意文件後綴是 .rs
windows 7 下Rust 入門 Helloworld 怎麼編寫
5、打開一個 COMMAND, 轉到 文件保存目錄，輸入 rustc hello.rs,回車。
windows 7 下Rust 入門 Helloworld 怎麼編寫
6、如果源代碼沒有寫錯的話，就會生成 hello.exe 文件
windows 7 下Rust 入門 Helloworld 怎麼編寫
7、驗證結果 ，在COMMAND 中 直接 輸入 hello.exe
如果 顯示 hello world，表示編寫成功
windows 7 下Rust 入門 Helloworld 怎麼編寫
8、rust 編程還是比較簡單容易上手的。

Ⅷ 現實中程序員是怎樣飛快敲代碼的

敲代碼很快有幾個條件

1.對項目代碼和結構非常熟悉，知道整個數據流的在代碼中的流動過程和變化過程。知道當前新增的代碼在整個項目處於哪個位置，對於數據會有產生什麼新的變化。這些要心理有數。也就是從架構層面去思考代碼的編寫。

2.對於需求理解的很透。這樣業務邏輯轉成代碼邏輯就不會有任何不清楚的地方。

3.已經解決了技術難點，也就是說前期測試性代碼已經寫過了弄清楚了，避免了突然出現的技術性難點

4.新增的代碼和新增的數據結構已經仔細思考過了，並設計好。也清楚引入這些新的代碼和數據結構對現有代碼的整體影響

5.異常點的位置的處理方案已經安排好了。寫代碼一部分是正常業務流程，演算法過程，但是另外一大塊就是處理各種異常。當異常出現之後，是代碼重試，報錯後忽略，還是報錯之後停止代碼，還是報錯後清理代碼並重新恢復上一個狀態，等等。這些都是要心理有數。

6.對於如何新增源代碼文件，命名函數，命名文件名，命名類名，命名變數名有一整套方案。有時候想個函數名或者變數名都要卡好幾分鍾，就不算飛快了。別笑，想個變數名，網路十來分鍾的時候多了去了。

7.外部環境已經准備好了。IDE穩定，資料庫結構穩定，數據穩定，網路穩定，訪問網頁順暢，准備好免打擾的牌子。准備好刷卡提需求的二維碼，准備好板磚和大刀，預防產品經理提需求和改需求。

Ⅸ linux rustup 沒有

1：如果包是通過yum或者rpm方式安裝 rpm -qa 包的名字 2：如果是源碼編譯安裝 ps -aux 文件名 3.簡單粗暴的方法 find / -name *文件名*

Ⅹ Ajax技術是否封裝了JDBC訪問資料庫的代碼

ajax無法封裝到JDBC代碼。
【1】ajax是客戶端的控制技術，用來控制瀏覽器中某（IE是XMLHttpRequest）插件，這個插件是負責通信的，也就是說ajax是通過控制這個插件來實現通信控制的。
【2】JDBC是伺服器端的資料庫訪問技術，而ajax是客戶端的通信控制技術，兩者相差甚遠，沒有關系，這樣ajax是無法封裝JDBC的，再說ajax是使用Javascript語言的，是過程性語言，而封裝是面向對象語言的術語，兩者的差別很大。
【3】不過可以使用ajax來「訪問「到JDBC代碼。它也不過能夠提交請求和接收伺服器反饋（可以進行一定處理），其他的它鞭長莫及。