I/O using a STL container

This is a discussion on I/O using a STL container within the C++ Programming forums, part of the General Programming Boards category; http://www.shreve-lib.org I am new to C++ programming using the STL Library. Can someone demostrate a code snippit that would equate ...

  1. #1
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    Wink I/O using a STL container

    http://www.shreve-lib.org

    I am new to C++ programming using the STL Library. Can someone demostrate a code snippit that would equate the same performance as this:


    #include <fstream.h>

    #include <iostream.h>



    int main()

    {

    char HaveTextArray[250], *HavePtr,HaveFile[20];
    HaveFile="HaveTextFile.txt";
    HavePtr=&HaveTextArray;

    ofstream Text_file(HaveFile);

    //Creates an instance of ofstream, and opens HaveTextFile.txt

    Text_file<<"This text will be placed into the file HaveTextFile.txt";

    //Outputs to HaveTextFile.txt through Text_file

    Text_file.close();

    //Closes up the file

    ifstream Text_file(HaveFile)
    //Opens for reading the file

    while(HavePtr!=EOF) {
    //Reads a string - up to 250 characters long - from the file

    Text_file>>HavePtr;
    HavePtr++;
    }

    cout<<HaveTextArray;

    Text_file.close();

    //Close the file.

    }

    /*
    Now how do I do the samething using a contain in the STL where a class holds the data container?

    -----------------------------------------------------------------------------------
    */

    // Setup a class to hold the container:
    using STD;
    class StorageContainer {
    std::Map(char Array[250]);
    }

    // I may not have set this up right, but you see what is am trying to do

    /* How would I use "StorageContainer" to load up the "Array" varable, STORE IT into a file called "Text_File" and retrieve the
    data from the "StorageContainer" class's STL container?
    */
    Last edited by LA Mills; 04-19-2003 at 01:21 PM.

  2. #2
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    Alright, you typed too many comments. Be more specific and get to the point.

    Assuming the source file containers texts, where do you want to store them? Do you want to store them in a container? What container?

    Kuphryn

  3. #3
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    reading a space delimited file with ints into a STL vector container. Uncompiled.
    Code:
    #include <fstream>
    #include <vector>
    
    using namespace std;
    
    int main()
    {
       int x;
       vector <int> data;
        ifstream fin("MyData.txt");
        fin >> x;
        while(!fin.eof())
        {
            data.push_back(x);
            fin >> x; 
        }
        //do something with data here
    }

  4. #4
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    "reading a space delimited file with ints into a STL vector"

    Yeah, but apparently he wants an STL container for chars. Does a string object count?

  5. #5
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    fair enough

    change the <int> to <char> and int x to char x and as long as the file is delimited by whitespace everything is cool.

    to use with STL strings add #include <string> change <int> to <string>, change int x to string x, and change fin >> x to getline(fin, x, delimitingChar).

    The underlying structure of the program remains the same, the individual components differ depending on needs/desires.

  6. #6
    Skunkmeister Stoned_Coder's Avatar
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    why not just use istream_iterator and ostream_iterator to read into and out of a container
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

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