How to get file size using boost::filesystem library

To get the filesize (in bytes) of any file (test.xml in our example) using the boost::filesystem library, use this snippet:

#include <experimental/filesystem>
#include <iostream>

using namespace std;
using namespace std::experimental::filesystem;

int main() {
    size_t filesize = file_size("test.xml");
    cout << filesize << endl;

You need to link the boost_filesystem and the boost_system libraries, i.e. compile like this:

g++ -o test test.cpp -lboost_filesystem -lboost_system