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  • How are iterators and pointers related?

    - by sharptooth
    Code with iterators looks pretty much like code with pointers. Iterators are of some obscure type (like std::vector<int>::iterator for example). What I don't get is how iterators and pointer are related to each other - is an iterator a wrapper around a pointer with overloaded operations to advance to adjacent elements or is it something else?

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  • Delphi 6: How to search a dynamic array for sub-string quickly?

    - by Robert Oschler
    How can I search a dynamic array of char in Delphi 6 for a sub-string and get back an index to a match, not a pointer? I've seen functions in Delphi 6 that do this for strings but not for dynamic char arrays. There is a function called SearchBuf but that function returns a PChar pointer to the match location when what I need is the array index of the match. Thanks.

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  • Hide/Show some HTML table cells individually and align the remaining cells as they belong to the same row [closed]

    - by Brian
    [Edited at the resquest of admins] The best way I can explain my problem is showning an example. I have the table that you can see on the link below (since I can't post images...), that ha a table head (blue) and four rows, whose cells are green and white in color. I just want the white cells to hide/show alternately by clicking on green cells, which would remain always visible as parent cells. After hiding white cells, the green ones should be aligned into the same row, as they would fit like tetris bricks. That's all, I think more clear is impossible. http://i.stack.imgur.com/3n3In.jpg (follow the link to see the image explanation) The table code: <table class="columns" cellspacing="0" border="0"> <tr> <td class="left" rowspan="2"> <div style="text-align:center;"></div> </td> </tr><tr><td class="middle"> <div id="detail_table_source" style="display:none"></div> <br> <table id="detail_table" class="detail"> <colgroup> <col style="width:20px;"> <col style="width:40px;"> <col style="width:70px;"> <col style="width:20px;"> </colgroup> <thead> <tr> <th width="88">Blahhh</th> <th width="211">BLAHH</th> <th width="229">BLAHH</th> </tr> </thead> <tbody> <tr class="parent" id="row123" style="cursor: pointer; " title="Click to expand/collapse"> <td bgcolor="#A6A4CC">Blahhh</td> <td bgcolor="#A6A4CC">blah blah </td> <td bgcolor="#A6A4CC">Blahh</td> </tr> <tr class="child-row123" style="display: none; "> <td rowspan="3" bgcolor="#5B5B5B">&nbsp;</td> <td>blah blah </td> <td>blah blah</td> </tr> <tr class="child-row123" style="display: none; "> <td>blah blah</td> <td>blah blah</td> </tr> <tr class="child-row123" style="display: none; "> <td>blah blah</td> <td>blah blah</td> </tr> <tr> <td bgcolor="#6B7A94" class="parent" id="row456" style="cursor: pointer; " title="Click to expand/collapse"><strong>Blahh</strong></td> <td bgcolor="#FFFFFF" class="child-cell456" style="display: none; ">blah blah</td> <td bgcolor="#FFFFFF" class="child-cell456" style="display: none; ">blah blah</td> </tr> <tr> <td rowspan="4" valign="top" bgcolor="#5B5B5B" class="child-row456" style="display: none; ">&nbsp;</td> <td bgcolor="#6B7A94" class="parent" id="cell456" style="cursor: pointer; " title="Click to expand/collapse">blah blah</td> <td bgcolor="#6B7A94" class="parent" id="cell456" style="cursor: pointer; " title="Click to expand/collapse">blah blah</td> </tr> <tr> <td class="child-cell456" style="display: none; ">blah blah</td> <td class="child-cell456" style="display: none; ">blah blah</td> </tr> <tr> <td class="child-cell456" style="display: none; ">blah blah</td> <td class="child-cell456" style="display: none; ">blah blah</td> </tr> </tbody> </table> The script to hide/show whole rows (this works because it is copied from another example): <script language="javascript"> $(function() { $('tr.parent') .css("cursor","pointer") .attr("title","Click to expand/collapse") .click(function(){ $(this).siblings('.child-'+this.id).toggle(); }); $('tr[@class^=child-]').hide().children('td'); }); </script> And the failed attempt at expanding/hiding individual cells: <script language="javascript"> $(function() { $('td.parent') .css("cursor","pointer") .attr("title","Click to expand/collapse") .click(function(){ $(this).siblings('.child-'+this.id).toggle(); }); $('td[@class^=child-]').hide().children('td'); }); </script>

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  • complex arguments for function

    - by myPost1
    My task is to create function funCall taking four arguments : pointer for 2d array of ints that stores pairs of numbers variable int maintaining number of numbers in 2d array pointer for table of pointers to functions int variable storing info about number of pointers to functions I was thinking about something like this : typedef int(*funPtr)(int, int); funPtr arrayOfFuncPtrs[]; void funCall( *int[][]k, int a, *funPtr z, int b); { }

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  • This code appears to achieve the return of a null reference in C++

    - by Chuck
    Hi folks, My C++ knowledge is somewhat piecemeal. I was reworking some code at work. I changed a function to return a reference to a type. Inside, I look up an object based on an identifier passed in, then return a reference to the object if found. Of course I ran into the issue of what to return if I don't find the object, and in looking around the web, many people claim that returning a "null reference" in C++ is impossible. Based on this advice, I tried the trick of returning a success/fail boolean, and making the object reference an out parameter. However, I ran into the roadblock of needing to initialize the references I would pass as actual parameters, and of course there is no way to do this. I retreated to the usual approach of just returning a pointer. I asked a colleague about it. He uses the following trick quite often, which is accepted by both a recent version of the Sun compiler and by gcc: MyType& someFunc(int id) { // successful case here: // ... // fail case: return *static_cast<MyType*>(0); } // Use: ... MyType& mt = somefunc(myIdNum); if (&mt) // test for "null reference" { // whatever } ... I have been maintaining this code base for a while, but I find that I don't have as much time to look up the small details about the language as I would like. I've been digging through my reference book but the answer to this one eludes me. Now, I had a C++ course a few years ago, and therein we emphasized that in C++ everything is types, so I try to keep that in mind when thinking things through. Deconstructing the expression: "*static_cast(0);", it indeed seems to me that we take a literal zero, cast it to a pointer to MyType (which makes it a null pointer), and then apply the dereferencing operator in the context of assigning to a reference type (the return type), which should give me a reference to the same object pointed to by the pointer. This sure looks like returning a null reference to me. Any advice in explaining why this works (or why it shouldn't) would be greatly appreciated. Thanks, Chuck

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  • Null reference for first memory address between 0 - 65535

    - by Terry
    I would like to understand a bit more about memory and I was unable to find it from Google, please forgive me if this is silly question. How come the following code, accessing memory address 0(and up to 65535) in C# would throw NullReferenceException byte* pointer = (byte*)0; byte test = *pointer; Thanks a lot in advance!

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  • Change cursor style in firefox input file tag

    - by JohnJ
    I have been trying to change the cursor style to look like a pointer rather than an I beam thing, but it looks like FF does not respect the cursor spec in an input file field. For example, I have made this small fiddle: http://jsfiddle.net/jDZtn/4/ where Id like the cursor to look like a pointer rather than an Ibeam when the user hovers over it. My end plan is to introduce opacity==0 and use a clickable button over it. I am not sure if this behaviour is a bug or not.

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  • Does (size_t)((char *)0) ever not evaluate to 0?

    - by Bruce Christensen
    According to the responses in "Why subtract null pointer in offsetof()?" (and my reading of K&R), the C standard doesn't require that (size_t)((char *)0) == 0. Still, I've never seen a situation where casting a null pointer to an integer type evaluates to anything else. If there is a compiler or scenario where (size_t)((char *)0) != 0, what is it?

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  • How to create PHP method linking?

    - by Kerry
    I've seen other objects that do this: $obj->method1()->method2(); How do I do that? Is each function just modifying the pointer of an object or returning a pointer? I don't know the proper term for this style -- if anyone could help me with that, it would be great.

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  • Function defined but not used in C

    - by thetna
    I have following code: static __inline__ LIST list_List(POINTER P) { return list_Cons(P,list_Nil()); } After compilation I got following warning: inlining is unlikely but function size may grow I removed the inline and changed into the following : static LIST list_List(POINTER P) { return list_Cons(P,list_Nil()); } Now I get the following warning: list_List is defined but not used. Can anybody please suggest me how can remove that warning.

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  • C++ pointers and constructors

    - by lego69
    if I have this snippet of the code A a1(i); A a2 = a1; A *pa1 = new A(a2); can somebody please explain what exactly the last line does, it makes copy of the a2 and pointer for this new object is pa1 or it just creates pointer for a2, thanks in advance

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  • how does sizeof work with array in C++

    - by skydoor
    Hi, I was told the array name is a pointer char a[] = "a" but when sizeof(a) = 2 why not it is a size of pointer here? however when I define it like this char* a ="a"; we get sizeof(a) =4; Well, I think I need more information about how does sizeof work with the array names.... Can anyone elaborate that?

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  • transferring parameters in C++

    - by lego69
    hello, can I have this snippet of the code: C *pa1 = new C(c2); and I transfer it to another function: foo(pa1); what exactly do I transfer actual pointer or its copy, thanks in advance and can somebody give some info about in which cases info is copied, and in which I transfer actual pointer

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  • Recommendation for PHP-FPM pm.max_children, PHP-FPM pm.start_servers and others

    - by jaypabs
    I have the following server: Intel® Xeon® E3-1270 v2 Single Processor - Quad Core Dedicated Server CPU Speed: 4 x 3.5 Ghz w/ 8MB Smart Cache Motherboard: SuperMicro X9SCM-F Total Cores: 4 Cores + 8 Threads RAM: 32 GB DDR3 1333 ECC Hard Drive: 120GB Smart Cache: 8MB I am using ubuntu 12.04 - nginx, php, mysql with ISPConfig 3. Under ISPConfig 3 website settings: I have this default value: PHP-FPM pm.max_children = 10 PHP-FPM pm.start_servers = 2 PHP-FPM pm.min_spare_servers = 1 PHP-FPM pm.max_spare_servers = 5 PHP-FPM pm.max_requests = 0 My question is what is the recommended settings for the above variable? Because I found some using a different settings.

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  • Two SATA HDDs connected using a Black Duet HDD Docking Station via eSATA to my Laptop, second drive

    - by leeand00
    Hi I am using a BlacX Duet HDD Docking Station to connect a 1TB WD Caviar Black SATA HDD (WD10000LSRTL) and a HITACHI SATA DESKSTAR (0S00163) to my G51VX (BestBuy) laptop via the eSATA port. When I plug in both HDDs in to the Docking Station, connect the docking station to my laptop and start Windows 7 (64-bit Ultimate), only the HDD in the first drive in the port actually shows up in My Computer and Disk Management. If I swap the drives positions I can get them both to work, but never at the same time. I also checked in the bios settings on the laptop, under Advanced-IDE Configuration-SATA Operation Mode, and it displays: SATA Operation Mode: [Enhanced] AHCI Port0 [Hard Disk] Device: Hard Disk Vendor: ST9320421AS LBA Mode: Supported S.M.A.R.T.: Supported AHCI Port5 [Hard Disk] Device: Hard Disk Vendor: Hitachi HDS721010CLA332 Size: 100.00 GB LBA Mode: Supported S.M.A.R.T.: Supported There should be a third drive, but I'm not certain why it is not being picked up. Additionally, before I played around with the settings in the IDE configuration, it used to display the DVD as well.

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  • OCZ Vertex 2 not recognized by Ubuntu installer

    - by Zsub
    As I boot into the Ubuntu 10.10 (or 11.04, doesn't matter) live environment or installer, it just refuses to recognise my Vertex 2. It reports the disk as ATA and not supporting smart, shows no serial number, and doesn't list the size correctly. All fdisk tells me is Unable to read /dev/sda (it's the only storage in the PC). I'm now running a temporary install of Windows 7 off of it, which worked like a charm, so where am I going wrong with Ubuntu... Specs: Asus M4N68T-M LE V2 (BIOS 0702, most recent) OCZ Vertex 2 SSD 60 GB Amd Athlon II X4 640 Patriot PSD34G13332 4GB DDR3 ram (two banks) EDIT I installed a second drive, installed Ubuntu on that and booted, it recognised the SSD just fine. I'm now trying to apt-get upgrade the live-environment. I wonder if there is any way to sort of install Ubuntu from Ubuntu (I boot into the working install on the other drive, install it on the SSD and then boot from the SSD). EDIT2 Ok, so that doesn't work. The install detects the SSD, however, it cannot format it. EDIT3 After a fresh boot I can read out SMART-data and even perform a read-benchmark, but if I try to format it, or do a write-bench, it'll crap out and after that it says SMART is not supported. So basically it seems I can't write to the disk, as it will stop working when I do, I will try to run repeated read-benchmarks to see if that has any effect. EDIT4 I'm running several read benchmarks on the drive right now, they give results that are to be expected from an SSD. If the read-benches don't fail, I can use fdisk on the disk, but it is now stuck trying to re-read the partition table after issueing the 'w' command. EDIT5 Parted Magic did recognize the drive and with hdparm -I even could tell me the drive was in a frozen state. I powercycled it (just pull out the plug from the SSD and plug it back in) and it wasn't frozen anymore. After that I could upgrade the firmware on the drive (still using Parted Magic) and format it to Ext4. After I rebooted into the Ubuntu installer, it wouldn't get recognized and hdparm didn't want to talk to it saying HDIO_DRIVE_CMD(identify) failed: Invalid exchange. EDIT6 For some reason if I enable one of the RAID controllers (the one the SSD is connected to, obviously) Ubuntu will let me format it, mount it and write to it. The installer also recognizes it. However if the raid controller is enabled but no array is defined the motherboard can't boot from it :(

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  • Adaptec 5805 after reboot don't starting

    - by Rakedko ShotGuns
    After rebooting the system, the controller is not included. It only works if the computer is shut down and turn off. Late i update firmware "Adaptec RAID 5805 Firmware Build 18948" How to fix the problem? add Log Configuration summary Server name.....................raid_test Adaptec Storage Manager agent...7.31.00 (18856) Adaptec Storage Manager console.7.31.00 (18856) Number of controllers...........1 Operating system................Windows Configuration information for controller 1 ------------------------------------------------------- Type............................Controller Model...........................Adaptec 5805 Controller number...............1 Physical slot...................2 Installed memory size...........512 MB Serial number...................8C4510C6C9E Boot ROM........................5.2-0 (18948) Firmware........................5.2-0 (18948) Device driver...................5.2-0 (16119) Controller status...............Optimal Battery status..................Charging Battery temperature.............Normal Battery charge amount (%).......37 Estimated charge remaining......0 days, 16 hours, 12 minutes Background consistency check....Disabled Copy back.......................Disabled Controller temperature..........Normal (40C / 104F) Default logical drive task priorityHigh Performance mode................Dynamic Number of logical devices.......1 Number of hot-spare drives......0 Number of ready drives..........0 Number of drive(s) assigned to MaxCache cache0 Maximum drives allowed for MaxCache cache8 MaxCache Read Cache Pool Size...0 GB NCQ status......................Enabled Stay awake status...............Disabled Internal drive spinup limit.....0 External drive spinup limit.....0 Phy 0...........................No device attached Phy 1...........................No device attached Phy 2...........................No device attached Phy 3...........................1.50 Gb/s Phy 4...........................No device attached Phy 5...........................No device attached Phy 6...........................No device attached Phy 7...........................No device attached Statistics version..............2.0 SSD Cache size..................0 Pages on fetch list.............0 Fetch list candidates...........0 Candidate replacements..........0 69319...........................31293 Logical device..................0 Logical device name............. RAID level......................Simple volume Data space......................148,916 GB Date created....................09/19/2012 Interface type..................Serial ATA State...........................Optimal Read-cache mode.................Enabled Preferred MaxCache read cache settingEnabled Actual MaxCache read cache setting Disabled Write-cache mode................Enabled (write-back) Write-cache setting.............Enabled (write-back) Partitioned.....................Yes Protected by hot spare..........No Bootable........................Yes Bad stripes.....................No Power Status....................Disabled Power State.....................Active Reduce RPM timer................Never Power off timer.................Never Verify timer....................Never Segment 0.......................Present: controller 1, connector 0, device 0, S/N 9RX3KZMT Overall host IOs................99075 Overall MB......................4411203 DRAM cache hits.................71929 SSD cache hits..................0 Uncached IOs....................29239 Overall disk failures...........0 DRAM cache full hits............71929 DRAM cache fetch / flush wait...0 DRAM cache hybrid reads.........3476 DRAM cache flushes..............-- Read hits.......................0 Write hits......................0 Valid Pages.....................0 Updates on writes...............0 Invalidations by large writes...0 Invalidations by R/W balance....0 Invalidations by replacement....0 Invalidations by other..........0 Page Fetches....................0 0...............................0 73..............................10822 8...............................3 46138...........................4916 27184...........................15226 20875...........................323 16982...........................1771 1563............................5317 1948............................2969 Serial attached SCSI ----------------------- Type............................Disk drive Vendor..........................Unknown Model...........................ST3160815AS Serial Number...................9RX3KZMT Firmware level..................3.AAD Reported channel................0 Reported SCSI device ID.........0 Interface type..................Serial ATA Size............................149,05 GB Negotiated transfer speed.......1.50 Gb/s State...........................Optimal S.M.A.R.T. error................No Write-cache mode................Write back Hardware errors.................0 Medium errors...................0 Parity errors...................0 Link failures...................0 Aborted commands................0 S.M.A.R.T. warnings.............0 Solid-state disk (non-spinning).false MaxCache cache capable..........false MaxCache cache assigned.........false NCQ status......................Enabled Phy 0...........................1.50 Gb/s Power State.....................Full rpm Supported power states..........Full rpm, Powered off 0x01............................113 0x03............................98 0x04............................99 0x05............................100 0x07............................83 0x09............................75 0x0A............................100 0x0C............................99 0xBB............................100 0xBD............................100 0xBE............................61 0xC2............................39 0xC3............................69 0xC5............................100 0xC6............................100 0xC7............................200 0xC8............................100 0xCA............................100 Aborted commands................0 Link failures...................0 Medium errors...................0 Parity errors...................0 Hardware errors.................0 SMART errors....................0 End of the configuration information for controller 1 List item

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