std::filesystem::directory_entry::exists - cppreference.com (original) (raw)

bool exists() const; (1) (since C++17)
(2) (since C++17)

Checks whether the pointed-to object exists. Effectively returns:

Note that status() follows symlinks to their targets.

[edit] Parameters

ec - out-parameter for error reporting in the non-throwing overload

[edit] Return value

true if the referred-to filesystem object exists.

[edit] Exceptions

Any overload not marked noexcept may throw std::bad_alloc if memory allocation fails.

  1. Throws std::filesystem::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.

  2. Sets a std::error_code& parameter to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur.

[edit] Example

#include #include   int main() { for (auto const str: { "/usr/bin/cat", "/usr/bin/mouse", "/usr/bin/python", "/usr/bin/bison", "/usr/bin/yacc", "/usr/bin/c++", }) { std::filesystem::directory_entry entry{str};   std::cout << "directory entry " << entry << (entry.exists() ? " exists\n" : " does not exist\n"); } }

Possible output:

// Output on a POSIX system: directory entry "/usr/bin/cat" exist directory entry "/usr/bin/mouse" does not exist directory entry "/usr/bin/python" exists directory entry "/usr/bin/bison" exists directory entry "/usr/bin/yacc" does not exist directory entry "/usr/bin/c++" exists

[edit] See also

| | checks whether path refers to existing file system object (function) [edit] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |