std::rename (3) - Linux Manuals

std::rename: std::rename

NAME

std::rename - std::rename

Synopsis

Defined in header <cstdio>
int rename( const char *old_filename, const char *new_filename );

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

old_filename - pointer to a null-terminated string containing the path identifying the file to rename
new_filename - pointer to a null-terminated string containing the new path of the file

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::experimental::filesystem::rename.

Example

// Run this code

  #include <iostream>
  #include <fstream>
  #include <cstdio>
  int main()
  {
      bool ok{std::ofstream("from.txt").put('a')}; // create and write to file
      if (!ok) {
          std::perror("Error creating from.txt");
          return 1;
      }

      if (std::rename("from.txt", "to.txt")) {
          std::perror("Error renaming");
          return 1;
      }

      std::cout << std::ifstream("to.txt").rdbuf() << '\n'; // print file
  }

Output:

  a