replace = /* unspecified */,
add = /* unspecified */,
remove = /* unspecified */,
nofollow = /* unspecified */
This type represents available options that control the behavior of the function std::filesystem::permissions().
perm_options satisfies the requirements of BitmaskType (which means the bitwise operators operator&, operator|, operator^, operator~, operator&=, operator|=, and operator^= are defined for this type).
At most one of add, remove, replace may be present, otherwise the behavior of the permissions function is undefined.
replace permissions will be completely replaced by the argument to permissions() (default behavior) add permissions will be replaced by the bitwise OR of the argument and the current permissions remove permissions will be replaced by the bitwise AND of the negated argument and current permissions nofollow permissions will be changed on the symlink itself, rather than on the file it resolves to [edit] Example
#include <filesystem>
#include <fstream>
#include <iostream>
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--[edit] See also
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