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#include <iostream>
using namespace std;
 
int main() {
	ifstream in[3];
    for (int i = 0; i < 3; i++)
    {
        in[i].open(this->Files.setFiles[sources[i]]);
        in[i].seekg(positions[sources[i]], ios::beg);
    }
    ofstream out;
    out.open(this->Files.setFiles[indexFileForMerge]);
    string s[3];
    while (true)
    {
        for (int i = 0; i < 3; i++)
        {
            cout << in[i].tellg() << ' ';
            getline(in[i], s[i]);
            cout <<  s[i].length() << ' ' << in[i].tellg() << '\n';
        }
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:5:11: error: elements of array ‘std::ifstream in [3]’ have incomplete type
  ifstream in[3];
           ^~
prog.cpp:5:11: error: storage size of ‘in’ isn’t known
prog.cpp:8:20: error: invalid use of ‘this’ in non-member function
         in[i].open(this->Files.setFiles[sources[i]]);
                    ^~~~
prog.cpp:8:41: error: ‘sources’ was not declared in this scope
         in[i].open(this->Files.setFiles[sources[i]]);
                                         ^~~~~~~
prog.cpp:9:21: error: ‘positions’ was not declared in this scope
         in[i].seekg(positions[sources[i]], ios::beg);
                     ^~~~~~~~~
prog.cpp:11:14: error: aggregate ‘std::ofstream out’ has incomplete type and cannot be defined
     ofstream out;
              ^~~
prog.cpp:12:14: error: invalid use of ‘this’ in non-member function
     out.open(this->Files.setFiles[indexFileForMerge]);
              ^~~~
prog.cpp:12:35: error: ‘indexFileForMerge’ was not declared in this scope
     out.open(this->Files.setFiles[indexFileForMerge]);
                                   ^~~~~~~~~~~~~~~~~

Standard output is empty