[fs.op.absolute]

path absolute(const path& p, const path& base = current_path());

Returns: An absolute path ([fs.def.absolute.path]) composed according to Table [tab:absolute.path].

Table 126 — absolute(const path&, const path&) return value

	p.has_root_directory()	!p.has_root_directory()
p.has_root_name()	p	2.4in p.root_name() / absolute(base).root_directory() / absolute(base).relative_path() / p.relative_path()
!p.has_root_name()	absolute(base).root_name() / p	absolute(base) / p

[ Note: For the returned path, rp, rp.is_absolute() is true. — end note ]

Throws: As specified in [fs.err.report].

27 Input/output library [input.output]