Defined in header <filesystem> | ||
enumclass perm_options{ replace=/* unspecified */, | (since C++17) | |
This type represents available options that control the behavior of the functionstd::filesystem::permissions().
perm_options satisfies the requirements ofBitmaskType (which means the bitwise operatorsoperator&,operator|,operator^,operator~,operator&=,operator|=, andoperator^= are defined for this type).
At most one ofadd,remove,replace may be present, otherwise the behavior of the permissions function is undefined.
| Enumerator | Meaning |
replace | permissions will be completely replaced by the argument topermissions() (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 |
#include <filesystem>#include <fstream>#include <iostream> void demo_perms(std::filesystem::perms p){usingstd::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--
(C++17) | modifies file access permissions (function)[edit] |
(C++17) | identifies file system permissions (enum)[edit] |
