m******t
发帖数: 2416 | 1
So I would use convert1 typically , convert3 iff there is a contract
explicitly mandates the list staying unchanged (but then in that case
I would have encapsulated the list in a class).
convert2 doesn't make any sense.
If thread-safty is an issue, I would explicitly synch on the list
rather than convert3, because if there is another thread modifying
the list at the same time, the for loop might still run into problems. |
|
b******d
发帖数: 794 | 2 看官方天书的意思，好像是constructor被继承了。。。
An anonymous class cannot have an explicitly declared constructor. Instead,
a Java compiler must automatically provide an anonymous constructor for the
anonymous class. The form of the anonymous constructor of an anonymous class
C with direct superclass S is as follows:
If S is not an inner class, or if S is a local class that occurs in a st
atic context, then the anonymous constructor has one formal parameter for ea
ch actual argument to the class instance cre... 阅读全帖 |
|
f*******n
发帖数: 12623 | 3 I don't understand what's so hard about this.
An anonymous class is anonymous -- it doesn't have a name. It doesn't need
explicit constructors, because there is only one way it can be created.
Anything that can be accomplished with an explicit constructor, can be
accomplished with the implicit constructor that calls the superclass
constructor, initializer block, and capturing of variables.
When you have an anonymous class creation expression like this:
A x = new A(args) {
// members
};
It is b... 阅读全帖 |
|
r*******n
发帖数: 3020 | 4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I don't think explicit variable declaration are needed for dynamic languages
, could you give a case explicit variable declarations are necessary.
lack of local variable scoping.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I think python supports this, maybe I don't get you,
could you give a example.
typos
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
it's true, be careful of typos, but same goes for other dynamic
languages. |
|
t****t
发帖数: 6806 | 5 怎么你们发言之前不想想的吗，basic_string的explicit ctor只有一个，是以
Allocator为参数的。从const char*过去，怎么可能需要explicit？？ |
|
z****e
发帖数: 2024 | 6 try to add explicit to your constructor to see the effect.
explicit A::A(string, int) |
|
e****d
发帖数: 895 | 7 来自主题: Programming版 - C++0x Except nameof(), there are equivalent items for the ones you
suggested. Any obvious advantage to add them?
%if-%else => template partial/explicit specialization + SFINAE
typeof() => template partial/explicit specialization + auto
+ decltype + suffix function return syntax
variant type => boost::any, template type parameter.
It seems to me those items you suggested are cosmetic.
like
( |
|
n*w
发帖数: 3393 | 8 第一帖这个图c#比java快这个多的原因之一就有generics。
这个链接有详细比较。http://www.jprl.com/Blog/archive/development/2007/Aug-31.html
其中summery的第一句就否定了你的”trivial“断言。
“
Summary
The generics capabilities in Java and .NET differ significantly. Syntax wise
, Java and C# generics initially look quite similar, and share similar
concepts such as constraints. The semantics of generics is where they differ
most, with .NET permitting full runtime introspection of generic types and
generic type parameters in ways that are obvious in ... 阅读全帖 |
|
g***l
发帖数: 2753 | 9 你如果不包含R自己的package，应该没有问题。
2.11 Can I use R for commercial purposes?
R is released under the GNU General Public License (GPL) version 2. If you
have any questions regarding the legality of using R in any particular
situation you should bring it up with your legal counsel. We are in no
position to offer legal advice.
It is the opinion of the R Core Team that one can use R for commercial
purposes (e.g., in business or in consulting). The GPL, like all Open Source
licenses, permits all and any use o... 阅读全帖 |
|
G*****7
发帖数: 1759 | 10 my prev post was wrong. i was thinking about a case of template implemented
in cpp without explicit instantiation or export. that turns out to be
problematic. an instantiation was hidden somewhere in the function
implementations.
what does the latest standard say about implemenations in cpp? can we do it
without inclusion into .h, explicit inst or export? |
|
S**I
发帖数: 15689 | 11 If you explicitly define the copy assigment operator, you can simply use
B& operator=(const B& b0){m_a = b0.m_a;return *this;}
instead of memcpy.
Nothing prevents you from explicitly assigning a value to a data member with
reference type. It is just not the compiler's responsibility to do this for
you.
While VC 6 is a buggy compiler, it does nothing wrong here. All modern
decent C++ compilers should generate the same error in your first post. |
|
y******u
发帖数: 804 | 12 贴首诗吧，引引大牛们吧
Zen of Python
Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
... 阅读全帖 |
|
q****x
发帖数: 7404 | 13 都是关于书写风格的。
1. 有必要手动禁用default ctor吗？
class A {
public:
explicit A(int i) : data_(i) {}
private:
int data_;
};
class A {
public:
explicit A(int i) : data_(i) {}
A() = delete;
private:
int data_;
};
有人认为第一个写法就够了，编译器不会自动生成default ctor。有人认为第二个写法
好，直接告诉用户default ctor是要禁用的，以免用户不小心又添加了default ctor。
谁有道理？
2. 纯虚类的虚函数声明。
纯虚类里只要有一个函数为虚，则所有都为虚。但声明纯虚时可以有多个变种如下。哪
个规范？
第一个写法，把所有的虚函数都声明为纯虚。
class A {
public:
virtual ~A() = 0;
virtual void foo() = 0;
virtual void bar() = 0;
};
inline A::~A() = d... 阅读全帖 |
|
d****i
发帖数: 4809 | 14 把你的constructor变成explicit就可以防止implicit conversion:
class A
{
public:
explicit A(int n = 0)
: m_n(n)
{
std::cout << 'd';
}
};
() |
|
r*g
发帖数: 186 | 15 标准中说引入explicit是为了抑制意料之外的隐士类型转换
这个东西来自于C, 在C++中继承了这一特性
但是就挖出了这么多坑
最开始explict Constructor(other)
是为了抑制其他other2 先转换为other再调用
Constructor(other)
引入operator other()的目的是有时候other类是使用者无法修改的
比如是一些闭源的代码
这时候other2类中加入operator other()的自定义转换函数就能使得
从other可以转换到other2 other2也能转换到other
作为一种"对称". (我参考的原帖下面reference中解释)
但是引入了这个东西后
就使得影视类型转化变得更加复杂
于是又引入了explicit operator other()的概念
........ |
|
f********x
发帖数: 99 | 16 The world beyond batch: Streaming 101: A high-level tour of modern data-
processing concept
http://radar.oreilly.com/2015/08/the-world-beyond-batch-streami
by Tyler Akidau August 5, 2015
Editor’s note: This is the first post in a two-part series about the
evolution of data processing, with a focus on streaming systems, unbounded
data sets, and the future of big data.
Streaming data processing is a big deal in big data these days, and for good
reasons. Amongst them:
Businesses crave ever more tim... 阅读全帖 |
|
发帖数: 1 | 17 line 11：int隐式转化成类型A，这里直接调用了A的A(int), 如果把这个构造函数声明
成explicit
explicit A(int n = 0)
那么line 11也不会编译通过。
line 13, 是因为A b();被编译器parse成了一个函数声明，编译时是顺序扫描的，当看
到这个声明时，编译器还没有看到下一行b.Show(), 当他扫描到下一行解析时，发现b.
Show()并不是b的一个函数调用，故而出错。如果你写成b()就不会编译出错。但是当链
接时，因为没有b这个函数的实现，会发生链接错误。
A的构造函数的整数参数虽然有default值，但是A b()会被当成函数声明，写成A b或者
A b(3)就可以。 |
|
G*P
发帖数: 214 | 18 不过第一段英语写得真差，之前如果完全不知道此事的话，这段话可以让你云里雾里，
而且混淆当事人
http://www.nature.com/news/2011/110608/full/474140a.html
Whistle-blower claims his accusations cost him his job
University denies it retaliated against researcher who questioned supervisor
's data.
Eugenie Samuel Reich
Zebrafish embryos are at the centre of a dispute over research integrity.
Zebrafish embryos are at the centre of a dispute over research integrity.R.
KESSEL/VISUALS UNLIMITED/CORBIS
After months of friction that culminated in his open... 阅读全帖 |
|
j*****d
发帖数: 787 | 19 interesting story .hahaha
旧案：中国科学院院士被解聘
已有 1110 次阅读 2011-4-3 16:27 |个人分类:另眼看中国|系统分类:海外观察
近日在读美国外交关系委员会（Council on Foreign Relations）的史国力（Adam
Segal）博士的新著《优势：美国创新如何战胜亚洲的挑战》(Advantage: How
American Innovation Can Overcome the Asian Challenge, New York: Norton, 2011
)。书里在讲述海归对中国科技体制改革的贡献时，提到了中国科学院神经所的一桩旧
案。
记得曾从《科学时报》上读到过“记中科院上海神经所所长蒲慕明：但求慈航心中渡”
的专访，蒲慕明提到：“一位资深研究员因为不肯接受国际专家的学术评估，我们不得
不终止他的聘书。”
“记中科院上海神经所所长蒲慕明：但求慈航心中渡”的链接：http://news.sciencenet.cn/htmlnews/2010/1/227542.shtm?id=227542
究竟哪个“资深研究员”被“终... 阅读全帖 |
|
q****2
发帖数: 208 | 20 Mark
interesting story .hahaha
旧案：中国科学院院士被解聘
已有 1110 次阅读 2011-4-3 16:27 |个人分类:另眼看中国|系统分类:海外观察
近日在读美国外交关系委员会（Council on Foreign Relations）的史国力（Adam
Segal）博士的新著《优势：美国创新如何战胜亚洲的挑战》(Advantage: How
American Innovation Can Overcome the Asian Challenge, New York: Norton, 2011
)。书里在讲述海归对中国科技体制改革的贡献时，提到了中国科学院神经所的一桩旧
案。
记得曾从《科学时报》上读到过“记中科院上海神经所所长蒲慕明：但求慈航心中渡”
的专访，蒲慕明提到：“一位资深研究员因为不肯接受国际专家的学术评估，我们不得
不终止他的聘书。”
“记中科院上海神经所所长蒲慕明：但求慈航心中渡”的链接：http://news.sciencenet.cn/htmlnews/2010/1/227542.shtm?id=227542
究竟哪个“资深研... 阅读全帖 |
|
v**********m
发帖数: 5516 | 21 http://sciencecareers.sciencemag.org/career_magazine/previous_i
Taken for Granted
The not-quite-stated, awful truth
By
Beryl Lieff Benderly
January 08, 2015
For all but a small percentage of aspiring researchers, doing a postdoc at a
university is a lousy idea because it will neither result in an academic
job nor otherwise advance one’s career.
My dictionary defines “gaffe” as an embarrassing social blunder. In
Washington, D.C., gaffe means something a little different: It’s when a
political fig... 阅读全帖 |
|
i******d
发帖数: 4 | 22 I was trying use matlab to slove a complicated system of nonlinear algebraic
equation by function Solve. But it shows explicite solutions couldn't be
found. (for some parameters,it gives me solution in 5 minutes.but if i change
the parameter, it may takes forever for matlab or no explicit solution)
my equations are below. Unknowns are x, y and z, others are parameters.
Ssmith=solve('R*g*S*y/x^3-a*(1+0.5*R*g*y/x^3)/(b+R*g*y/x^3)-alpha*z/x^2=0',...
'0.0016*(647.68*z-1)*h0*x/(1+0.0024*(647.68*z |
|
g******s
发帖数: 733 | 23 Thanks a lot for your post, it's very helpful. I just found the problem you
said, and another very similar problem is coming for double double precision,
or real*16 (kind=16). Say I want to give pi a value 3.1415926536, the value
would not change if I explicitly use "D0". However, if I declare pi to be kind
=16, the value will change even when I explicitely used "D0".
Here is the code,
PROGRAM MAIN
IMPLICIT NONE
real(kind=16) pi
pi=3.1415926536d0
print*,pi
END
the value will change to 3.14159265 |
|
l*******G
发帖数: 1191 | 24 Oops, even though I found the cause of the problem, there doesn't seem to
exist a simple solution to it. Matlab does not have an explicit way to stop
the file checks on linux system?? I understand IDE may want to check number
of files etc in current dir in order to search for programs etc. When
running code without IDE, it makes no sense!
It is terrible that matlab would slow down because number of files in folder
is large.
A sloppy solution is to save the files in a subfolder rather than in the... 阅读全帖 |
|
l*******G
发帖数: 1191 | 25 Oops, even though I found the cause of the problem, there doesn't seem to
exist a simple solution to it. Matlab does not have an explicit way to stop
the file checks on linux system?? I understand IDE may want to check number
of files etc in current dir in order to search for programs etc. When
running code without IDE, it makes no sense!
It is terrible that matlab would slow down because number of files in folder
is large.
A sloppy solution is to save the files in a subfolder rather than in the... 阅读全帖 |
|
o******d
发帖数: 743 | 26 现在说起中国政府债务，英文媒体一般都是引用下面这个政治学家，似乎还没有见到哪
个经济学家在搞这方面研究。据我所知此人的数量能力极其一般，但因为没有别人做同
样研究，大家也只好听他的。请问有经济学家在做这方面的计算吗？
Combined with central government debt and other liabilities such as bad
bank loans, analysts estimate China’s overall explicit debt load is about
70 per cent of gross domestic product.
But some analysts believe the contingent liabilities of the government
are much higher, once debts on the books of state-owned enterprises and
other entities implicitly backed by the state are inclu... 阅读全帖 |
|
a*****g
发帖数: 19398 | 27 反对 PARCC考试的大潮——PARCC Refusal Campaign
High school students in Bloomington and Normal, Illinois, have organized a
student union, called the Blono Student Union, to oppose PARCC. it is called
the Blono Student Union.
Students in Bloomington and Normal, Illinois, Join to Oppose PARCC Tests
Refusing the PARCC
An effective way to resist standardized testing is to simply not participate
in it; refusing state tests is a common, legal strategy used all over the
nation. Students and parents around the co... 阅读全帖 |
|
B********e
发帖数: 10014 | 28 it seems that no explicit expression exists.
you can substitue y for the exponent ,solve x for y then end up with the dec
oupled integrations. one of the integration is like:
\int{exp(k\sqrt{1-x^2})dx}. but as simple as this one it's difficult to get
explicit anti-deri. |
|
k*******l
发帖数: 69 | 29 At that time, no manipulation of symbols (aka algebra) existed. That is to
say, special cases represent the understanding of some truth, e.g. the Gou
Gu Theorem. This applied univerally to all over the world in ancient time.
For example,the Diophantine equation x^2 - N y^2 = 1 was solved by Indian
mathematicians by certain explicit rules for explicit integers, without
really manipulating the symbols. But nobody would deny the fact that they
did solve it in a general way. It is the same for the G |
|
x********i
发帖数: 905 | 30 http://arxiv.org/abs/1509.05576
The Riemann hypothesis is, and will hopefully remain for a long time, a
great motivation to uncover and explore new parts of the mathematical world.
After reviewing its impact on the development of algebraic geometry we
discuss three strategies, working concretely at the level of the explicit
formulas. The first strategy is "analytic" and is based on Riemannian spaces
and Selberg's work on the trace formula and its comparison with the
explicit formulas. The second... 阅读全帖 |
|
h*y
发帖数: 1289 | 31 Binomial Tree is fast, at least compared to MC simulation.
It's somehow like the explicit finite difference. By choosing right
parameter, we avoid the instability in explicit FD.
Similar to FD, one shortcoming for BT I would say is the dimension. For two
underlying processes, you may still build a pyramid. But if there are more
than two underlying processes, it's probably better to do simulation. |
|
J**********g
发帖数: 213 | 32 I doubt it has an explicit expression for the ito integral.
It's clear that it equals to
\int_0^1 I_{B_t>0}dB_t (*)
but I don't know how to keep going. I might be wrong, but there might not be
an explicit expression for (*). |
|
c******y
发帖数: 3269 | 33 I'm not 大牛, and no longer use MS SQL server. Below is a real-life example,
hope it helps.
Background: VPN network to connect database, a bottleneck to overcome.
implicit sql-passthrough is exchanging data intensively, which choked the
VPN network, where you would see huge difference between real time and cpu
time.
explicit sql-passthrough only sends a command to the database, the database
do the data manipulation within itself, and sends final data back to SAS,
costing way much less network reso... 阅读全帖 |
|
S****M
发帖数: 2198 | 34 我司平时用Teradata，但在SAS里还是用explicit pass-through最多。这样SQL在SQL
Assistant里写好debug完就能直接在SAS里跑。Explicit的问题（或许我孤陋寡闻）是
没法上传数据，这时候就只能用libname了。 |
|
j*a
发帖数: 14423 | 35 that's not the point. swinging from one extreme to another is not
wise and you are better than this.
here's what i think:
originator can post whatever she wants, with or without picture,
with or without rights reserved, in a public board, subject to
board and site regulation.
you on the other hand, can by default 转载 without explicit
permission, as long as there's no explicit notice from originator
telling you otherwise.
so far so good.
now originator notices that post is 转载ed and doesnt like it.... 阅读全帖 |
|
f*********g
发帖数: 1637 | 36 Where is what you called "Hate Speech受宪法保护"? First, The Constitution
never explicitly spells out any detail, including "Hate Speech", so all you
can say is about possible case law. Then tell us which case law explicitly
said "Hate Speech"受宪法保护? |
|
|
|
|
w*******y
发帖数: 60932 | 40 PLEASE MARKED PROMO CODE USED IF YOU USE IT
Download the "Watch The Throne" MP3 from JAY-Z & Kanye West NOW
You got your tickets to the show - now make sure to get the record that's a
big part of the show! As a ticket holder to the JAY-Z & Kanye West - Watch
The Throne Tour, you get a copy of the most anticipated release of the year,
the new album, "Watch The Throne" - for EACH TICKET PURCHASED! If you've
already redeemed yours, but still have some extra codes available, make sure
to send them t... 阅读全帖 |
|
|
c**i
发帖数: 6973 | 42 (1) Okinawa Bases
http://www.mitbbs.com/article_t0/Military/33726477.html
(2) Japan under Democratic Party of Japan (DPJ) explicitly wanted to move
away US and toward China--to have equilateral triangle. China has spoiled
the opportunities. I cannot figure out why China is self-destructive. |
|
w*********s
发帖数: 2136 | 43 【 以下文字转载自 WorldNews 讨论区 】
发信人: whiteclouds (/ 参考消息 /), 信区: WorldNews
标 题: 诺贝尔奖背后的政治
发信站: BBS 未名空间站 (Wed Oct 13 23:20:19 2010, 美东)
Nobel Politics
10/13/10, Stephen Lendman
Since first awarded in 1901, Nobel Peace recognition went to 98 individuals
and 23 organizations. Last year, another war criminal won, Barack Obama, one
among many previous ones. A earlier article on the Nobel Committee's long
and inglorious tradition may be accessed through THIS link.
Nearly always, politics, not merit, deter... 阅读全帖 |
|
h*******e
发帖数: 510 | 44 Accueil
Boutique ésotérique
Prophéties de Nostradamus
Jeux pour adultes et séniors
Applications pour PC
Jouets d'enfants
Jeux PC
Equipement pour PC
Télécharger les jeux gratuits
Jeux sur consoles
Jeux Playstation 3
Accessoires et consoles
Google !
Nostradamus, Les prophéties de Nostradamus
Articles d'interprétations, recherches , forums, boutique, voyance
dictionnaire des Centuries de Nostradamus et prophéties célèbres.
Ce site explique les Centuries de Nostradamus ainsi que les prophéties ... 阅读全帖 |
|
p**********d
发帖数: 7918 | 45 http://www.nytimes.com/2011/04/04/world/asia/04museum.html?_r=1
April 3, 2011
At China’s New Museum, History Toes Party Line
By IAN JOHNSON
BEIJING — At the elaborately renovated National Museum of China in
Tiananmen Square, visitors interested in the recent history of the world’s
fastest rising power can gaze at the cowboy hat that Deng Xiaoping once wore
when he visited the United States, or admire the bullhorn that President Hu
Jintao used to exhort people to overcome hardship after the Sichu... 阅读全帖 |
|
C********g
发帖数: 9656 | 46 余华
原文：The Spirit of May 35th （载《纽约时报》—中国来信， 2011年6月23日）
译者：爻义
你可能认为5月35日是个虚拟的日子，但在中国，它是真实存在的。它指的实际上是6月
4日，1989年发生“天安门事件“的日子，这个词在互联网上被禁掉了，人们于是使用
“5月35日”来逃避审查和纪念那天发生的事。
今年早些时候我访问台湾的时候，我的书《十个词汇里的中国》在那儿刚刚出版。我被
问到，“为什么这本书不能在大陆出版，而你的小说《兄弟》却可以？”
这就是虚构与非虚构的差别：尽管两本书都是关于当代中国的，《兄弟》触及的是隐晦
的事因而可以成为漏网之鱼，而《十个词汇里的中国》过于直白，逃不过审查。
“《兄弟》是5月35日”，我解释道，“而《十个词汇里的中国》更像6月4日。”
想要表达观点的话，5月35日式的词汇成了今天的例行规则。根据最新的数字，中国有
四亿五千七百万网民，三亿三百万中国人可以用手机上网。在网上控制这些用户不越距
是巨大的工作，政府最有效的控制机制是把某些词汇设定为不可接受，直接禁止它们在
网上使用。
于是那些热衷于表达他们自己观点的人发现他们... 阅读全帖 |
|
U********S
发帖数: 1896 | 47 看来方“道歉”了，不过是百般抵赖，被MSU教授再次公开信猛打。道歉也不忘完全不相干的肖传国啊。
http://blog.sina.com.cn/s/blog_502041670102dset.html
方舟子“道歉”还诡辩，“根伯”再批不留情
方舟子“道歉”还诡辩，“根伯”再批不留情
（求真网2010年8月5日电）中国科坛打黑的第一颗和第二颗原子弹分别于2010年7月28日和2010年8月3日爆炸后，中国科坛第一前台黒客方舟子一面组织水军造谣惑众、恶毒攻击求真人士、还要对美制“原子弹”的英文挑毛病，一面用假名与美国教授“辩理”结果被打了一棒。最后，实在赖不下去了，方舟子亲自给美国教授“根伯”发了如下的“道歉”信。
Dear Dr. Root-Bernstein,
In 1995 when I was a graduate student at MSU, I posted a short writing to an online forum called alt.chinese.text when there was a debate about pseudoscience among ... 阅读全帖 |
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s********n
发帖数: 26222 | 48 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 续：美国教授再次公开信严斥方舟子剽窃,附英文信原件
发信站: BBS 未名空间站 (Thu Aug 25 01:00:37 2011, 美东)
美国教授再次公开信严斥方舟子剽窃
见http://health.gmw.cn/2011-08/22/content_2501491.htm
光明网8月21日讯（记者 李然）美国密歇根州立大学生理学教授Root-Bernstein于2011
年8月21日确认其指控方舟子《科学是什么》一文实际90%左右是抄袭他本人的作品《神
创论是科学的理论吗》，及一系列公开信的真实性。
方舟子在《科学是什么》一文中所提出的观点与罗伯特教授惊人的相似。《科学是什么
》全文1600字，其中约有900字几乎原文引自罗伯特教授的《神创论是科学的理论吗》
一文，构成了《科学是什么》的主要观点。但并未注明这些观点的出处。
Root-Bernstein教授明确公开授权所有感兴趣的人翻译并传播其过去及将来的公开信，
认为越多人知情越好。
Root-... 阅读全帖 |
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