std::filesystem::directory_entry:: is_regular_file

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C++
Filesystem library
Classes
Functions
File types
std::filesystem::directory_entry
Member functions
Modifiers
Observers
directory_entry::is_regular_file
(until C++20) (until C++20) (until C++20) (until C++20) (until C++20) (C++20)
Non-member functions
bool is_regular_file ( ) const ;
(1) (since C++17)
bool is_regular_file ( std:: error_code & ec ) const noexcept ;
(2) (since C++17)

Checks whether the pointed-to object is a regular file. Effectively returns:

1) std:: filesystem :: is_regular_file ( status ( ) ) .
2) std:: filesystem :: is_regular_file ( status ( ec ) ) .

Parameters

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

Return value

true if the referred-to filesystem object is a regular file, false otherwise.

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.

Example

Run this code 
#include <filesystem>
#include <iostream>
#include <string>
 
namespace fs = std::filesystem;
 
int main(int argc, const char* argv[])
{
    // Print out all regular files in a directory 'dir'.
    try
    {
        const auto dir{argc == 2 ? fs::path{argv[1]} : fs::current_path()};
 
        std::cout << "Current dir: " << dir << '\n'
                  << std::string(40, '-') << '\n';
 
        for (fs::directory_entry const& entry : fs::directory_iterator(dir))
            if (entry.is_regular_file())
                std::cout << entry.path().filename() << '\n';
    }
    catch(const fs::filesystem_error& e)
    {
        std::cout << e.what() << '\n';
    }
}

Possible output: 

Current dir: "/tmp/1588616534.9884143"
----------------------------------------
"main.cpp"
"a.out"

See also

(C++17)
checks whether the argument refers to a regular file
(function)
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