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I just tried your example code but changed it to:

ofstream myfile("example.txt", ios::out | ios::binary);
myfile << "Writing this to a file.\n";
myfile.close();

This created and wrote to "example.txt" in the directory that I ran the node from. I tried running from several different directories, and each time the file "example.txt" showed up in the directory I was in, and had nothing to do with the location of the node binary.

I just tried your example code but changed it to:

#include <fstream>
using namespace std;
.
.
.
ofstream myfile("example.txt", ios::out | ios::binary);
myfile << "Writing this to a file.\n";
myfile.close();

This Edit: Cleaning up thanks to @joq's comment.

Using rosrun this created and wrote to "example.txt" in the directory that I ran the node from. I tried running from several different directories, and each time the file "example.txt" showed up in the directory I was in, and had nothing to do with the location of the node binary.