std::filesystem::directory_entry::assign

Since C++17

Assigns new content to the directory entry object. Sets the path to p and calls refresh to update the cached attributes. If an error occurs, the values of the cached attributes are unspecified.

# Declarations

void assign( const std::filesystem::path& p );

(since C++17)

void assign( const std::filesystem::path& p, std::error_code& ec );

(since C++17)

# Parameters

p: path to the filesystem object to which the directory entry will refer
ec: out-parameter for error reporting in the non-throwing overload

# Return value

(none)

# Example

#include <filesystem>
#include <fstream>
#include <iostream>
 
void print_entry_info(const std::filesystem::directory_entry& entry)
{
    if (std::cout << "The entry " << entry; not entry.exists())
    {
        std::cout << " does not exists on the file system\n";
        return;
    }
    std::cout << " is ";
    if (entry.is_directory())
        std::cout << "a directory\n";
    if (entry.is_regular_file())
        std::cout << "a regular file\n";
    /*...*/
}
 
int main()
{
    std::filesystem::current_path(std::filesystem::temp_directory_path());
 
    std::filesystem::directory_entry entry{std::filesystem::current_path()};
    print_entry_info(entry);
 
    std::filesystem::path name{"cppreference.html"};
    std::ofstream{name} << "C++";
 
    std::cout << "entry.assign();\n";
    entry.assign(entry/name);
    print_entry_info(entry);
 
    std::cout << "remove(entry);\n";
    std::filesystem::remove(entry);
    print_entry_info(entry); // the entry still contains old "state"
 
    std::cout << "entry.assign();\n";
    entry.assign(entry); // or just call entry.refresh()
    print_entry_info(entry);
}

# See also

operator=