C ++: boost / filesystem: some questions

Question

I am using the C ++ Boost library running in the Ubuntu environment. I have some questions that I don't understand about:

• fs::is_directory

  namespace fs = boost::filesystem;
  
  
  fs::path full_path(fs::initial_path<fs::path>() );
  
  
  full_path = fs::system_complete(fs::path( "temp/"));
  
  
  if(fs::is_directory(full_path ))
  {
     cout << "the path is a directory" << endl;
  }
  else
  {
     cout << "the path is not a directory" << endl;
  }
  

  => I am sure that at the moment when I run the program, there is a temporary directory folder in the same place with the executable file. But he always returns: "path is not a directory"?

• fs::last_write_time

  • Could this fs::last_write_time(path)get the last time to change for a given path for BOTH either a directory or a file?

  • If this is true for the directory, is it only true for the directory when it was created, or for the last time of the date if I add a file inside the folder?

• fs::directory_iterator

  • fs::directory_iterator dir(full_path) => how can I check if this 'dir' has any auxiliary directories or not?

• Is there a way in boost :: fileSystem to check if a file is opening?

, , !

Answer 1

• , . cout << fullpath , , , , , ?

• last_write_time. .

• fs::is_directory(dir->status()), , . (, dir )

• , boost:: filesystem , .

Answer 2

re 4: , , [boost::filesystem|std]::fstream::is_open()?