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Showing content from https://en.cppreference.com/w/cpp/algorithm/../filesystem/directory_entry/is_regular_file.html below:

std::filesystem::directory_entry::is_regular_file - cppreference.com

bool is_regular_file() const;

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

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

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

Throws

on underlying OS API errors, constructed with

as the first path argument and the OS error code as the error code argument.

Sets a

parameter to the OS API error code if an OS API call fails, and executes

if no errors occur.

#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"

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