std:: rename

Changes the filename of a file. The file is identified by character string pointed to by old_filename . The new filename is identified by character string pointed to by new_filename .

If new_filename exists, the behavior is implementation-defined.

Parameters

Return value

​ 0 ​ upon success or non-zero value on error.

Notes

POSIX specifies many additional details on the semantics of this function, which are reproduced in C++ by std::filesystem::rename .

Example

#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <iostream>
 
int main()
{
    if (!std::ofstream("from.txt").put('a')) // create and write to file
    {
        std::perror("Error creating from.txt");
        return EXIT_FAILURE;
    }
 
    if (std::rename("from.txt", "to.txt"))
    {
        std::perror("Error renaming");
        return EXIT_FAILURE;
    }
 
    std::cout << std::ifstream("to.txt").rdbuf() << '\n'; // print file
    return EXIT_SUCCESS;
}

a

See also