Assumed I have following static variable within a method:  void myClass::myFct() {    static int myvar=0;     ... }   The behaviour is clear, "myvar" is initialised only once and whenever it is changed during "..." on next call of myFct(), the last value of myvar can be seen but not the initial value.  Now my question: what happens when the class "myClass" is deleted and then created again? Does this affect "myvar" (means is it initialised again) or is it left untouched and also after deletion/construction of the parent class the last (modified) value can be seen there?  Thanks!
If a variable is declared as static in a function's scope it is only initialized once and retains its value between function calls. What exactly is its lifetime? When do its constructor and destructor get called?  void foo()  {      static string plonk = "When will I die?"; }
What's the tax on a hobby orchard? Which of the following sets are compact in $\mathbb{M}_n(\mathbb{R})$[NBHM_PhD Screening Test-2013, Topology] Which of the following sets are compact in $\mathbb{M}_n(\mathbb{R})$ (a) The set of all upper triangular matrices all of whose eigenvalues satisfy $|\lambda|≤2 $. (b) The set of all real symmetric matrices all of whose eigenvalues satisfy $|\lambda|≤2 $. (c) The set of all diagonalizable matrices all of whose eigenvalues satisfy $|\lambda|≤2 $.  (a) &amp; (c) are not true. But I am not sure about (b).can anybody help me please. Is there a command prompt  equivalent for Windows 7? That is, I want to filter out the results of a command:  Bash use:  ls | grep root  What would it be from a Windows command prompt? Is there a "sentence stretch" that acts horizontally in a similar way as \setstretch acts vertically? Answering a phone call with "Yes, XX, tell me" I have heard a lot of people pick their phone and go "Yes, XX, tell me" (highly used in India).  I think the right way should be "Hey, XX, what's up?" or "Hey, XX, what's going on"? But does this work in a professional environment? In my calculator why does $\sqrt4 -2=-8.1648465955514287168521180122928e-39?$ I have tried this on my Windows 7 calculator with $\sqrt9 -3 $ it too gives some weird answer- ie$1.1546388020691628168216106791278e-37$. And so for any $n$(positive) $\sqrt n^2-n= wierd_ .answer$ Why does this happen? How to add keyboard shortcuts? What is a meta for? A guest at my house over the weekend stood puzzled next to my driveway. &quot;What is that for?&quot; she asked, pointing to a framework of 2x4s and hardware cloth perched on an old tire amid piles of sand. &quot;Sifter.&quot; I said. &quot;For what?&quot; &quot;For sifting gravel.&quot; &quot;Why?&quot; &quot;To line walking paths, such as the one you're standing on...&quot; Spend enough time working with something, and it's easy to forget how strange and unnatural your makeshift tooling can appear to those unfamiliar with it.  Such is the nature of these meta sites. For 5 years, we've been directing folks to them for discussion and feedback, to commune with their community, hash out misunderstandings, propose changes and document the current state of things. And... We haven't always been good about helping them get past the initial shock and confusion of dealing with this system. This has manifested in several unfortunate behaviors:  Downvoting of legitimate support questions - those that are not duplicates and reflect an actual bug or honest misunderstanding of how the system operates. Folks who are acting in good faith should be treated as such - , not shutting them down.  Closing questions that seek input and discussion from the community - in hindsight, adding &quot;primarily opinion based&quot; as a close reason on meta sites was... a terrible idea. The old &quot;not constructive&quot; close reason made some sense for rants and so on, but for a discussion site closing down questions that solicit opinions is just silly. Here on MSE, we prefer the following off-topic reason instead:  This question does not appear to seek input and discussion from the community. If you have encountered a problem on one of our sites, please describe it in detail. See also:    The perception that Stack Exchange is disrupting the normal operation of the site by talking about future plans - even when those plans involve the community. I talked about this a bit more on , but seeing this kind of backlash toward folks at the company who were trying to be open and receptive to discussion about what they were doing was kinda disheartening - we need to be doing more of that, not less.  A reluctance to ask questions about asking questions - which is about as meta as you can get, and yet we probably get more of these via email than we see on meta, while being the least-qualified to answer them well.   After an increasing number of complaints from both core users and moderators on a number of sites, we're taking a hard look at how we can improve this situation... Starting with a change to :  Meta is for...  ...$SiteName users to communicate with each other about $SiteName (asking questions about how the websites work, or about policies and community decisions) ...$SiteName  users to communicate with Stack Exchange the company (posting bugs, suggesting improvements, or proposing new features), and ...Stack Exchange to communicate with the community (soliciting feedback on new ideas or features, or discussing policies that affect the whole network)  Lots of topics are fair game, as long as they are about the Stack Exchange family of Q&amp;A sites in some way. Any issue that concerns the core Stack Exchange engine that runs all Stack Exchange websites is welcome here.  This replaces the previous bullet list of specific topics, and aims to outline broad purposes with examples for clarification rather than constraining the scope to those examples. So... that's a start. But a documentation change isn't going to change misconceptions that've already built up among newer users. So I'm asking y'all for help: What do you think meta should be used for, and how can we better communicate this intent to new users? Why do we say the following?        I'll have an hour's wait at the airport      Today's lesson      Yesterday's programme    Two weeks' worth of groceries.      They are not possessive, or are they? Why is the possessive apostrophe used with time expressions and adverbs? What is the difference between weight and mass? What is the difference between the weight of an object and the mass of an object? Upon realizing it is a sarcophagus, he decides to sacrifice himself (I think by disconnecting his air) and exist in it for eternity along with the original creature. It may have been in an old Omni magazine, or some other periodical. I thought it may have been in the anthology "Dead Astronauts" but I did not find the story in there. Is there any freely available pointcloud data?   I'm especially interested in dense clouds of small areas(5m to 100m radius) but anything else would be fine too.   I've found that these pages have very nice and easy to access point cloud data. How can I prevent my text object from flickering? Iterating through list of list in Python I've heard of the idea of bootstrapping a language, that is, writing a compiler/interpreter for the language in itself.  I was wondering how this could be accomplished and looked around a bit, and saw someone say that it could only be done by either   writing an initial compiler in a different language. hand-coding an initial compiler in Assembly, which seems like a special case of the first   To me, neither of these seem to actually be bootstrapping a language in the sense that they both require outside support.  Is there a way to actually write a compiler in its own language? Creating point features with exact coordinates in QGIS? Plot points:   I think the man was one-armed or had one damaged/withered arm. He is an artist when we meet him. He's picked up by aliens to represent earth in a galactic armada. Put in a ship with other aliens only there so a representative of their species can be said to be present - but not expected to actually contribute much to the coming fight. Fight is to protect against invaders from another galaxy. Somehow or other, their ship and crew become integral to winning the war. I installed or upgraded to Ubuntu 16.04, but I'm having some problems with my graphics card.   The display is blank The display flickers Items on the screen do not display correctly Certain programs complain of graphics issues The computer boots to low-graphics mode Your specific issue may not be here, but try the solutions described in the answers anyway.   This question is very broad, but each one of these issues likely has one solution.    If you are experiencing a login loop, check the last part of my answer.    If you experience one of the listed issues and have your own solution (mine didn't work, or there's a faster way), feel free to post another POLITE answer, describing your problem and how you fixed it.    Those attempting to install Ubuntu, please refer to the section titled: If you are unable to enter a TTY or are trying to install Ubuntu. The official deck construction rules for Commander (nee EDH) at  say that 'A card's colour identity is its colour plus the colour of any mana symbols in the card's rules text.'  How does this apply to dual-faced cards with faces of different colors, such as  out of Innistrad or  from Dark Ascension, where the color of the transformed face of the card is different from the color of the 'main face'?  The spirit of the rules would seem to suggest that these cards are the colors of both faces for deck construction purposes, but not only are these spells always cast as the front face, the front face is the only one 'seen' in other game zones: for instance, when the card's in the library, you could find Elbrus by searching your library for an artifact, but you couldn't find Withengar Unbound by searching your library for a creature card.  Could Elbrus then, for instance, be played in any Commander deck, or just one with a (partly) Black general? How does Duff's device work?