How to check with boost::filesystem if a path is a creatable file?

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I want to check if a boost::filesystem::path provided by a user is actually a file which is createable. Createable means: the directory in front of the filename exists.

std::string input = ~/some/dir/file.xyz

boost::filesystem::path path(input);

if (~/some/dir is a directory) // <-- How to get this?
  return true;

What's a solution with boost::filesystem? Or maybe there are better tools?

asked 2 mins ago

user1587451

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How to check with boost::filesystem if a path is a creatable file?