Read from a input file until a string appears in C++

Question

I have an input file (.txt) like below -

BEGIN
ABC
DEF
END
BEGIN
XYZ
RST
END

I have to extract everything from BEGIN to END and store them in a string. So, from this file I'll have two strings.

"ABC
DEF"

"XYZ
RST"

I am using ifstream to read the input file. My question is, how can I parse the input file to get everything from one BEGIN to next END. getline() has character as delimiter, not string. Another way I tried was copying everything from the input file to a string and then parse the string based on .find(). However, in this method, I only get the first BEGIN to END.

Is there any way I can store everything in a string from the input file until a certain string appears (END)?

For storing purpose, I am using a vector<string> to store.

Answer 1

Replace filename with a proper name.

#include <fstream>
#include <iostream>
#include <iterator>
#include <vector>
#include <string>

using namespace std;

int main()
{
    char filename[] = "a.txt";
    std::vector<string> v;
    std::ifstream input(filename);
    string temp = "";
    for(std::string line; getline( input, line ); )
    {
        if(string(line) == "BEGIN")
            continue;
        else if(string(line) == "END")
        {
            v.push_back(temp);
            temp = "";
        }
        else
        {
            temp += string(line);
        }

    }
    for(int i=0; i<v.size(); i++)
        cout<<v[i]<<endl;
}