std::filesystem::path::has_root_path, std::filesystem::path::has_root_name, std::filesystem::path::has_root_directory, std::filesystem::path::has_relative_path, std::filesystem::path::has_parent_path, std::filesystem::path::has_filename, std::filesystem::path::has_stem, std::filesystem::path::has_extension

From cppreference.com

bool has_root_path() const;	(1)	(since C++17)
bool has_root_name() const;	(2)	(since C++17)
bool has_root_directory() const;	(3)	(since C++17)
bool has_relative_path() const;	(4)	(since C++17)
bool has_parent_path() const;	(5)	(since C++17)
bool has_filename() const;	(6)	(since C++17)
bool has_stem() const;	(7)	(since C++17)
bool has_extension() const;	(8)	(since C++17)

Checks whether the path contains the corresponding path element.

7) Checks whether

is empty.

(none)

true if the corresponding path component is not empty, false otherwise.

May throw implementation-defined exceptions.