std::filesystem::absolute (3) - Linux Manuals
std::filesystem::absolute: std::filesystem::absolute
NAME
std::filesystem::absolute - std::filesystem::absolute
Synopsis
Defined in header <filesystem>
path absolute(const std::filesystem::path& p); (since C++17)
path absolute(const std::filesystem::path& p, std::error_code& ec);
Returns a path referencing the same file system location as p, for which is_absolute() is true. The non-throwing overload returns default-constructed path if an error occurs.
Parameters
p - path to convert to absolute form
ec - out-parameter for error reporting in the non-throwing overload
Return value
Returns an absolute (although not necessarily canonical) pathname referencing the same file as p
Exceptions
The overload that does not take a std::error_code& parameter throws filesystem_error on underlying OS API errors, constructed with p as the first path argument and the OS error code as the error code argument. The overload taking a std::error_code& parameter sets it to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur. Any overload not marked noexcept may throw std::bad_alloc if memory allocation fails.
Notes
Implementations are encouraged to not consider p not existing to be an error.
For POSIX-based operating systems, std::filesystem::absolute(p) is equivalent to std::filesystem::current_path() / p
For Windows, absolute may be implemented as a call to GetFullPathNameW.
Example
// Run this code
Possible output:
See also
canonical composes a canonical path
weakly_canonical (function)
(C++17)
relative composes a relative path
proximate (function)
(C++17)