std::filesystem::directory_entry::exists
From cppreference.com
< cpp | filesystem | directory entry
| bool exists() const; bool exists( std::error_code& ec ) const noexcept; |
(since C++17) | |
Checks whether the pointed-to object exists. Effectively returns std::filesystem::exists(status()) or std::filesystem::exists(status(ec)), respectively (note that status() follows symlinks to their targets).
Parameters
| ec | - | out-parameter for error reporting in the non-throwing overload |
Return value
true if the referred-to filesystem object exists.
Exceptions
The overload that does not take a std::error_code& parameter throws 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. 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.
Example
Run this code
#include <filesystem> #include <iostream> int main() { for (auto const str: { "/usr/bin/cat", "/usr/bin/mouse", "/usr/bin/bison", "/usr/bin/c++", }) { std::filesystem::directory_entry entry{str}; std::cout << "directory entry " << entry << (entry.exists() ? " exists" : " does not exist") << '\n'; } }
Possible output:
// Output on a POSIX system: directory entry "/usr/bin/cat" does not exist directory entry "/usr/bin/mouse" does not exist directory entry "/usr/bin/bison" exists directory entry "/usr/bin/c++" exists
See also
| (C++17) |
checks whether path refers to existing file system object (function) |