std::experimental::filesystem::path::root_name
Min standard notice:
Returns the root name of the path. If the path does not include root name, returns path().
# Declarations
path root_name() const;
(filesystem TS)
# Return value
The root name of the path.
# Example
#include <experimental/filesystem>
#include <iostream>
namespace fs = std::experimental::filesystem;
int main()
{
std::cout << "Current root name is: " << fs::current_path().root_name() << '\n';
}