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std::filesystem::file_status::permissions

From cppreference.com
 
 
 
std::filesystem::file_status
Member functions
file_status::permissions
Non-member functions
(C++20)
 
std::filesystem::perms permissions() const noexcept;
(1) (since C++17)
void permissions( std::filesystem::perms perm ) noexcept;
(2) (since C++17)

Accesses the file permissions information.

1) Returns file permissions information.
2) Sets file permissions to perm.

[edit] Parameters

perm - file permissions to set to

[edit] Return value

1) File permissions information.
2) (none)

[edit] Example

#include <fstream>
#include <iostream>
#include <filesystem>
 
void demo_perms(std::filesystem::perms p)
{
    using std::filesystem::perms;
    auto show = [=](char op, perms perm)
    {
        std::cout << (perms::none == (perm & p) ? '-' : op);
    };
    show('r', perms::owner_read);
    show('w', perms::owner_write);
    show('x', perms::owner_exec);
    show('r', perms::group_read);
    show('w', perms::group_write);
    show('x', perms::group_exec);
    show('r', perms::others_read);
    show('w', perms::others_write);
    show('x', perms::others_exec);
    std::cout << '\n';
}
 
int main()
{
    std::ofstream("test.txt"); // create file
 
    std::cout << "Created file with permissions: ";
    demo_perms(std::filesystem::status("test.txt").permissions());
 
    std::filesystem::permissions(
        "test.txt",
        std::filesystem::perms::owner_all | std::filesystem::perms::group_all,
        std::filesystem::perm_options::add
    );
 
    std::cout << "After adding u+rwx and g+rwx:  ";
    demo_perms(std::filesystem::status("test.txt").permissions());
 
    std::filesystem::remove("test.txt");
}

Possible output:

Created file with permissions: rw-r--r--
After adding u+rwx and g+wrx:  rwxrwxr--