Add 10 to all input numbers using bind2nd, bind with placeholder (C++11) and generic lambda (C++14)

add10usingbind.cpp

#include <iostream>
#include <fstream>
#include <algorithm>
#include <functional>

using namespace std;

int main()
{
	ifstream inf("input.txt");
	if (!inf.fail())
	{
		ofstream outf("out.txt");
		if (!outf.fail())
		{
			istream_iterator<int> beg(inf), end;
			ostream_iterator<int> oit(outf, "\n");
			transform(beg, end, oit, bind(plus<int>(), atoi("10"), placeholders::_1));//using bind with placeholder (C++11)
		}
		else
		{
			cerr << "Error writing out.txt\n";
			return EXIT_FAILURE;
		}
	}
	else
	{
		cerr << "Error reading input\n";
		return EXIT_FAILURE;
	}
	return EXIT_SUCCESS;
}

add10usingbind2nd.cpp

#include <iostream>
#include <fstream>
#include <algorithm>
#include <functional>

using namespace std;

int main()
{
	ifstream inf("input.txt");
	if (!inf.fail())
	{
		ofstream outf("out.txt");
		if (!outf.fail())
		{
			istream_iterator<int> beg(inf), end;
			ostream_iterator<int> oit(outf, "\n");
			transform(beg, end, oit, bind2nd(plus<int>(), atoi("10")));//using bind2nd
		}
		else
		{
			cerr << "Error writing out.txt\n";
			return EXIT_FAILURE;
		}
	}
	else
	{
		cerr << "Error reading input\n";
		return EXIT_FAILURE;
	}
	return EXIT_SUCCESS;
}

add10usinggenlambda.cpp

#include <iostream>
#include <fstream>
#include <algorithm>
#include <functional>

using namespace std;

int main()
{
	ifstream inf("input.txt");
	if (!inf.fail())
	{
		ofstream outf("out.txt");
		if (!outf.fail())
		{
			istream_iterator<int> beg(inf), end;
			ostream_iterator<int> oit(outf, "\n");
			transform(beg, end, oit, [&](auto const& elem) { //using generic lambda (C++14)
				return elem + 10;
				});
		}
		else
		{
			cerr << "Error writing out.txt\n";
			return EXIT_FAILURE;
		}
	}
	else
	{
		cerr << "Error reading input\n";
		return EXIT_FAILURE;
	}
	return EXIT_SUCCESS;
}

expected_out.txt

11
12
13
14
15

input.txt

1 2 3 4 5