std::filesystem::is_empty (3) - Linux Man Pages

std::filesystem::is_empty: std::filesystem::is_empty

NAME

std::filesystem::is_empty - std::filesystem::is_empty

Synopsis


Defined in header <filesystem>
bool is_empty( const std::filesystem::path& p ); (since C++17)
bool is_empty( const std::filesystem::path& p, std::error_code& ec );


Checks whether the given path refers to an empty file or directory.

Parameters


p - path to examine
ec - error code to modify in case of error

Return value


true if the file indicated by p or if the type indicated s refers to an empty file or directory, false otherwise. The non-throwing overload returns false if an error occurs.

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.


Defect reports


The following behavior-changing defect reports were applied retroactively to previously published C++ standards.


DR Applied to Behavior as published Correct behavior
LWG_3013 C++17 error_code overload marked noexcept but can allocate memory noexcept removed

Example


 This section is incomplete
 Reason: no example

See also


status determines file attributes
symlink_status determines file attributes, checking the symlink target
               (function)
(C++17)
(C++17)


exists checks whether path refers to existing file system object
               (function)
(C++17)