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  • Porting a C++ application to android

    - by vivekian2
    Is it possible to port a C++ application which uses the STL extensively to Android? I understand that currently the NDK does not support this, but is there any effort (open source or otherwise) underway to achieve this? If not is there a way to cross compile libstdc++ for Android?

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  • How do I use Loki's small object allocator?

    - by Gregory
    I need to use Loki's small object allocator but I am very confused as to how it works. I've read the documentation and lots of forums but it doesnt make sense: some of them say to use the stl, others use custom allocators. I just need to be able to test its performance with allocating and deallocating objects of different sizes. Could someone please provide a small example of how to use it?

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  • Convert Byte Array into Bitset

    - by Unknown
    I have a byte array generated by a random number generator. I want to put this into the STL bitset. Unfortunately, it looks like Bitset only supports the following constructors: A string of 1's and 0's like "10101011" An unsigned long. (my byte array will be longer) The only solution I can think of now is to read the byte array bit by bit and make a string of 1's and 0's. Does anyone have a more efficient solution?

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  • Guidelines to an Iterator Class

    - by isurulucky
    Hi, I have a Red Black tree implemented in c++. It supports the functionality of a STL map. Tree nodes contain keys and the values mapped. I want to write an iterator class for this, but I'm stuck with how to do it. Should I make it an inner class of the Tree class? Can anyone give me some guidelines on how to write it + some resources?? Thank You!!

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  • NSMutableArray Vs Stack

    - by Chandan Shetty SP
    I am developing 2D game for iphone in Objectice-C.In this project I need to use stack, I can do it using STL(Standard template library) stacks or NSMutableArray, since this stack is widely used in the game which one is more efficient? @interface CarElement : NSObject { std::stack<myElement*> *mBats; } or @interface CarElement : NSObject { NSMutableArray *mBats; } Thanks,

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  • How ca I return a value from a function

    - by Shadi Al Mahallawy
    I used a function to calculate information about certain instructions I intialized in a map,like this void get_objectcode(char*&token1,const int &y) { map<string,int> operations; operations["ADD"] = 18; operations["AND"] = 40; operations["COMP"] = 28; operations["DIV"] = 24; operations["J"] = 0X3c; operations["JEQ"] =30; operations["JGT"] =34; operations["JLT"] =38; operations["JSUB"] =48; operations["LDA"] =00; operations["LDCH"] =50; operations["LDL"] =55; operations["LDX"] =04; operations["MUL"] =20; operations["OR"] =44; operations["RD"] =0xd8; operations["RSUB"] =0x4c; operations["STA"] =0x0c; operations["STCH"] =54; operations["STL"] =14; operations["STSW"] =0xe8; operations["STX"] =10; operations["SUB"] =0x1c; operations["TD"] =0xe0; operations["TIX"] =0x2c; operations["WD"] =0xdc; if ((operations.find("ADD")->first==token1)||(operations.find("AND")->first==token1)||(operations.find("COMP")->first==token1) ||(operations.find("DIV")->first==token1)||(operations.find("J")->first==token1)||(operations.find("JEQ")->first==token1) ||(operations.find("JGT")->first==token1)||(operations.find("JLT")->first==token1)||(operations.find("JSUB")->first==token1) ||(operations.find("LDA")->first==token1)||(operations.find("LDCH")->first==token1)||(operations.find("LDL")->first==token1) ||(operations.find("LDX")->first==token1)||(operations.find("MUL")->first==token1)||(operations.find("OR")->first==token1) ||(operations.find("RD")->first==token1)||(operations.find("RSUB")->first==token1)||(operations.find("STA")->first==token1)||(operations.find("STCH")->first==token1)||(operations.find("STCH")->first==token1)||(operations.find("STL")->first==token1) ||(operations.find("STSW")->first==token1)||(operations.find("STX")->first==token1)||(operations.find("SUB")->first==token1) ||(operations.find("TD")->first==token1)||(operations.find("TIX")->first==token1)||(operations.find("WD")->first==token1)) { int y=operations.find(token1)->second; //cout<<hex<<y<<endl; } return ; } which if I cout y in the function gives me an answer just fine which is what i need but there is a problem tring to return the value from the function so that I could use it outside the function , it gives a whole different answer, what is the problem

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  • C/C++ include file order/best practices

    - by aaa
    Hello. Is there recommended order in which include files should be specified? For example, the system files, STL, Boost, go before of after local include files? is there a particular reason to choose one or another? Thanks

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  • Windows API Programming

    - by Chris
    I found this site, http://www.apitalk.com/document.php?id=1184207999_1 and I'm not sure if this site is using ATL, STL, MFC, or just calling API functions directly. I have done console programming with C++ and graphics programmign with C++ in Borland, but I've have never done Win32 C++ programming and I'm curious if anyone knows of a good site to start with? Does anyone know of any good sites to recommend about getting up and going fast with Win32 API C++?

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  • Is it good practice to generally make heavyweight classes non-copyable?

    - by Emile Cormier
    I have a Shape class containing potentially many vertices, and I was contemplating making copy-constructor/copy-assignment private to prevent accidental needless copying of my heavyweight class (for example, passing by value instead of by reference). To make a copy of Shape, one would have to deliberately call a "clone" or "duplicate" method. Is this good practice? I wonder why STL containers don't use this approach, as I rarely want to pass them by value.

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  • Implementing a logging library in .NET with a database as the storage medium

    - by Dave
    I'm just starting to work on a logging library that everyone can use to keep track of any sort of system information while the user is running our application. The simplest example so far is to track Info, Warnings, and Errors. I want all plugins to be able to use this feature, but since each developer might have a different idea of what's important to report, I want to keep this as generic as possible. In the C++ world, I would normally use something like a stl::pair<string,string> to act as a key value pair structure, and have a stl::list of these to act as a "row" in the log. The log cache would then be a list<list<pair<string,string>>> (ugh!). This way, the developers can use a const string key like INFO, WARNING, ERROR to have a consistent naming for a column in the database (for SELECTing specific types of information). I'd like the database to be able to deal with any number of distinct column names. For example, John might have an INFO row with a column called USER, and Bill might have an INFO row with a column called FILENAME. I want the log viewer to be able to display all information, and if one report doesn't have a value for INFO / FILENAME, those fields should just appear blank. So one option is to use List<List<KeyValuePair<String,String>>, and the another is to have the log library consumer somehow "register" its schema, and then have the database do an ALTER TABLE to handle this situation. Yet another idea is to have a table that's just for key value pairs, with a foreign key that maps the key value pairs back to the original log entry. I obviously don't want logging to bog down the system, so I only lock the log cache to make a copy of the data (and remove the already-copied data), then a background thread will dump the information to the database. My specific questions regarding this are: Do you see any performance issues? In other words, have you ever tried something like this and found that certain things just don't work well in practice? Is there a more .NETish way to implement the key value pairs, other than List<List<KeyValuePair<String,String>>>? Even if there is a way to do #2 better, is the ALTER TABLE idea I proposed above a Bad Thing? Would you recommend multiple databases over a single one? I don't yet have an idea of how frequently the log would get written to, but we ideally would like to have lots of low level information. Perhaps there should be a DB with a fixed schema only for the low level stuff, and then another DB that's more flexible for reporting information back to users.

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  • Is it good practice to use std::size_t all over the place?

    - by dehmann
    I have a lot of constants in my code that are unsigned numbers, e.g. counters, frequency cutoffs, lengths, etc. I started using std::size_t for all of these, instead of int or unsigned int. Is that the right thing to do? I started it because the STL containers use it for their sizes, it's used for string position, etc.

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  • Reading data in from file

    - by user667430
    Hi Here is link if you want to download application: Simple banking app Text file with data to read I am trying to create a simple banking application that reads in data from a text file. So far i have managed to read in all the customers which there are 20 of them. However when reading in the accounts and transactions stuff it only reads in 20 but there is alot more in the text file. Here is what i have so far. I think it has something to do with the nested for loop in the getNextCustomer method. using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.IO; using System.Linq; using System.Text; using System.Windows.Forms; namespace e_SOFT_Banking { public partial class Form1 : Form { public static ArrayList bankDetails = new ArrayList(); public static ArrayList accDetails = new ArrayList(); public static ArrayList tranDetails = new ArrayList(); string inputDataFile = @"C:\e-SOFT_v1.txt"; const int numCustItems = 14; const int numAccItems = 7; const int numTransItems = 5; public Form1() { InitializeComponent(); setUpBank(); } private void btnShowData_Click_1(object sender, EventArgs e) { showListsOfCust(); } private void setUpBank() { readData(); } private void showListsOfCust() { listBox1.Items.Clear(); foreach (Customer c in bankDetails) listBox1.Items.Add(c.getCustomerNumber() + " " + c.getCustomerTitle() + " " + c.getFirstName() + " " + c.getInitials() + " " + c.getSurname() + " " + c.getDateOfBirth() + " " + c.getHouseNameNumber() + " " + c.getStreetName() + " " + c.getArea() + " " + c.getCityTown() + " " + c.getCounty() + " " + c.getPostcode() + " " + c.getPassword() + " " + c.getNumberAccounts()); foreach (Account a in accDetails) listBox1.Items.Add(a.getAccSort() + " " + a.getAccNumber() + " " + a.getAccNick() + " " + a.getAccDate() + " " + a.getAccCurBal() + " " + a.getAccOverDraft() + " " + a.getAccNumTrans()); foreach (Transaction t in tranDetails) listBox1.Items.Add(t.getDate() + " " + t.getType() + " " + t.getDescription() + " " + t.getAmount() + " " + t.getBalAfter()); } private void readData() { StreamReader readerIn = null; Transaction curTrans; Account curAcc; Customer curCust; bool anyMoreData; string[] customerData = new string[numCustItems]; string[] accountData = new string[numAccItems]; string[] transactionData = new string[numTransItems]; if (readOK(inputDataFile, ref readerIn)) { anyMoreData = getNextCustomer(readerIn, customerData, accountData, transactionData); while (anyMoreData == true) { curCust = new Customer(customerData[0], customerData[1], customerData[2], customerData[3], customerData[4], customerData[5], customerData[6], customerData[7], customerData[8], customerData[9], customerData[10], customerData[11], customerData[12], customerData[13]); curAcc = new Account(accountData[0], accountData[1], accountData[2], accountData[3], accountData[4], accountData[5], accountData[6]); curTrans = new Transaction(transactionData[0], transactionData[1], transactionData[2], transactionData[3], transactionData[4]); bankDetails.Add(curCust); accDetails.Add(curAcc); tranDetails.Add(curTrans); anyMoreData = getNextCustomer(readerIn, customerData, accountData, transactionData); } if (readerIn != null) readerIn.Close(); } } private bool getNextCustomer(StreamReader inNext, string[] nextCustomerData, string[] nextAccountData, string[] nextTransactionData) { string nextLine; int numCItems = nextCustomerData.Count(); int numAItems = nextAccountData.Count(); int numTItems = nextTransactionData.Count(); for (int i = 0; i < numCItems; i++) { nextLine = inNext.ReadLine(); if (nextLine != null) { nextCustomerData[i] = nextLine; if (i == 13) { int cItems = Convert.ToInt32(nextCustomerData[13]); for (int q = 0; q < cItems; q++) { for (int a = 0; a < numAItems; a++) { nextLine = inNext.ReadLine(); nextAccountData[a] = nextLine; if (a == 6) { int aItems = Convert.ToInt32(nextAccountData[6]); for (int w = 0; w < aItems; w++) { for (int t = 0; t < numTItems; t++) { nextLine = inNext.ReadLine(); nextTransactionData[t] = nextLine; } } } } } } } else return false; } return true; } private bool readOK(string readFile, ref StreamReader readerIn) { try { readerIn = new StreamReader(readFile); return true; } catch (FileNotFoundException notFound) { MessageBox.Show("ERROR Opening file (when reading data in)" + " - File could not be found.\n" + notFound.Message); return false; } catch (Exception e) { MessageBox.Show("ERROR Opening File (when reading data in)" + "- Operation failed.\n" + e.Message); return false; } } } } I also have three classes one for customers, one for accounts and one for transactions, which follow in that order. using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace e_SOFT_Banking { class Customer { private string customerNumber; private string customerTitle; private string firstName; private string initials; //not required - defaults to null private string surname; private string dateOfBirth; private string houseNameNumber; private string streetName; private string area; //not required - defaults to null private string cityTown; private string county; private string postcode; private string password; private int numberAccounts; public Customer(string theCustomerNumber, string theCustomerTitle, string theFirstName, string theInitials, string theSurname, string theDateOfBirth, string theHouseNameNumber, string theStreetName, string theArea, string theCityTown, string theCounty, string thePostcode, string thePassword, string theNumberAccounts) { customerNumber = theCustomerNumber; customerTitle = theCustomerTitle; firstName = theFirstName; initials = theInitials; surname = theSurname; dateOfBirth = theDateOfBirth; houseNameNumber = theHouseNameNumber; streetName = theStreetName; area = theArea; cityTown = theCityTown; county = theCounty; postcode = thePostcode; password = thePassword; setNumberAccounts(theNumberAccounts); } public string getCustomerNumber() { return customerNumber; } public string getCustomerTitle() { return customerTitle; } public string getFirstName() { return firstName; } public string getInitials() { return initials; } public string getSurname() { return surname; } public string getDateOfBirth() { return dateOfBirth; } public string getHouseNameNumber() { return houseNameNumber; } public string getStreetName() { return streetName; } public string getArea() { return area; } public string getCityTown() { return cityTown; } public string getCounty() { return county; } public string getPostcode() { return postcode; } public string getPassword() { return password; } public int getNumberAccounts() { return numberAccounts; } public void setCustomerNumber(string inCustomerNumber) { customerNumber = inCustomerNumber; } public void setCustomerTitle(string inCustomerTitle) { customerTitle = inCustomerTitle; } public void setFirstName(string inFirstName) { firstName = inFirstName; } public void setInitials(string inInitials) { initials = inInitials; } public void setSurname(string inSurname) { surname = inSurname; } public void setDateOfBirth(string inDateOfBirth) { dateOfBirth = inDateOfBirth; } public void setHouseNameNumber(string inHouseNameNumber) { houseNameNumber = inHouseNameNumber; } public void setStreetName(string inStreetName) { streetName = inStreetName; } public void setArea(string inArea) { area = inArea; } public void setCityTown(string inCityTown) { cityTown = inCityTown; } public void setCounty(string inCounty) { county = inCounty; } public void setPostcode(string inPostcode) { postcode = inPostcode; } public void setPassword(string inPassword) { password = inPassword; } public void setNumberAccounts(string inNumberAccounts) { try { numberAccounts = Convert.ToInt32(inNumberAccounts); } catch (FormatException invalidInput) { System.Windows.Forms.MessageBox.Show("ERROR" + invalidInput.Message + "Please enter a valid number"); } } } } Accounts: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace e_SOFT_Banking { class Account { private string accSort; private Int64 accNumber; private string accNick; private string accDate; //not required - defaults to null private double accCurBal; private double accOverDraft; private int accNumTrans; public Account(string theAccSort, string theAccNumber, string theAccNick, string theAccDate, string theAccCurBal, string theAccOverDraft, string theAccNumTrans) { accSort = theAccSort; setAccNumber(theAccNumber); accNick = theAccNick; accDate = theAccDate; setAccCurBal(theAccCurBal); setAccOverDraft(theAccOverDraft); setAccNumTrans(theAccNumTrans); } public string getAccSort() { return accSort; } public long getAccNumber() { return accNumber; } public string getAccNick() { return accNick; } public string getAccDate() { return accDate; } public double getAccCurBal() { return accCurBal; } public double getAccOverDraft() { return accOverDraft; } public int getAccNumTrans() { return accNumTrans; } public void setAccSort(string inAccSort) { accSort = inAccSort; } public void setAccNumber(string inAccNumber) { try { accNumber = Convert.ToInt64(inAccNumber); } catch (FormatException invalidInput) { System.Windows.Forms.MessageBox.Show("ERROR" + invalidInput.Message + "Please enter a valid number"); } } public void setAccNick(string inAccNick) { accNick = inAccNick; } public void setAccDate(string inAccDate) { accDate = inAccDate; } public void setAccCurBal(string inAccCurBal) { try { accCurBal = Convert.ToDouble(inAccCurBal); } catch (FormatException invalidInput) { System.Windows.Forms.MessageBox.Show("ERROR" + invalidInput.Message + "Please enter a valid number"); } } public void setAccOverDraft(string inAccOverDraft) { try { accOverDraft = Convert.ToDouble(inAccOverDraft); } catch (FormatException invalidInput) { System.Windows.Forms.MessageBox.Show("ERROR" + invalidInput.Message + "Please enter a valid number"); } } public void setAccNumTrans(string inAccNumTrans) { try { accNumTrans = Convert.ToInt32(inAccNumTrans); } catch (FormatException invalidInput) { System.Windows.Forms.MessageBox.Show("ERROR" + invalidInput.Message + "Please enter a valid number"); } } } } Transactions: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace e_SOFT_Banking { class Transaction { private string date; private string type; private string description; private double amount; //not required - defaults to null private double balAfter; public Transaction(string theDate, string theType, string theDescription, string theAmount, string theBalAfter) { date = theDate; type = theType; description = theDescription; setAmount(theAmount); setBalAfter(theBalAfter); } public string getDate() { return date; } public string getType() { return type; } public string getDescription() { return description; } public double getAmount() { return amount; } public double getBalAfter() { return balAfter; } public void setDate(string inDate) { date = inDate; } public void setType(string inType) { type = inType; } public void setDescription(string inDescription) { description = inDescription; } public void setAmount(string inAmount) { try { amount = Convert.ToDouble(inAmount); } catch (FormatException invalidInput) { System.Windows.Forms.MessageBox.Show("ERROR" + invalidInput.Message + "Please enter a valid number"); } } public void setBalAfter(string inBalAfter) { try { balAfter = Convert.ToDouble(inBalAfter); } catch (FormatException invalidInput) { System.Windows.Forms.MessageBox.Show("ERROR" + invalidInput.Message + "Please enter a valid number"); } } } } Any help greatly appreciated.

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  • autoexp.dat does not seem to take affect in Visual Studio C++ 2005 debugger.

    - by Pradyot
    autoexp.dat does not seem to take affect in Visual Studio C++ 2005 debugger. I am not trying to add any custom rules. Just want commonly used stuff like stl::string, to display in a friendlier manner. Does anyone know. how I can accomplish this? Is this just question of specifying a path to the autoexp.dat file somewhere. The file is available under the Visual Studio installation directory.

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  • C++ priority queue structure used ?

    - by John Retallack
    While searching for some functions in C++ STL documentation I read that push and pop for priority queues needs constant time. "Constant (in the priority_queue). Although notice that push_heap operates in logarithmic time." My question is what kind of data structure is used to mantain a priority queue with O(1) for push and pop ?

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  • C++ priority queue structure userd ?

    - by John Retallack
    While searching for some functions in C++ STL documentation I read that push and pop for priority queues needs constant time. "Constant (in the priority_queue). Although notice that push_heap operates in logarithmic time." My question is what kind of data structure is used to mantain a priority queue with O(1) for push and pop ?

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  • Getting the System tick count with basic C++?

    - by Donal Rafferty
    I essentially want to reconstruct the getTickCount() windows function so I can use it in basic C++ without any non standard libraries or even the STL. (So it complies with the libraries supplied with the Android NDK) I have looked at clock() localtime time But I'm still unsure whether it is possible to replicate the getTickCount windows function with the time library. Can anyone point me in the right direction as to how to do this or even if its possible?

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