bool is_directory() const; bool is_directory( std::error_code& ec ) const noexcept; | (since C++17) |
Checks whether the pointed-to object is a directory. Effectively returns std::filesystem::is_directory(status()) or std::filesystem::is_directory(status(ec)), respectively.
| ec | - | out-parameter for error reporting in the non-throwing overload |
true if the referred-to filesystem object is a directory, false otherwise.
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.
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
int main()
{
fs::directory_entry d1(".");
fs::directory_entry d2("file.txt");
fs::directory_entry d3("new_dir");
std::cout << std::boolalpha
<< ". d1 " << d1.is_directory() << '\n'
<< "file.txt d2 " << d2.is_directory() << '\n'
// false because it has not been created
<< "new_dir d3 " << d3.is_directory() << '\n';
fs::create_directory("new_dir");
std::cout << "new_dir d3 before refresh " << d3.is_directory() << '\n';
d3.refresh();
std::cout << "new_dir d3 after refresh " << d3.is_directory() << '\n';
}Possible output:
. d1 true file.txt d2 false new_dir d3 false new_dir d3 before refresh false new_dir d3 after refresh true
|
(C++17) | checks whether the given path refers to a directory (function) |
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