std::left,std::right,std::internal (3) - Linux Manuals

std::left,std::right,std::internal: std::left,std::right,std::internal

NAME

std::left,std::right,std::internal - std::left,std::right,std::internal

Synopsis

Defined in header <ios>
std::ios_base& left( std::ios_base& str ); (1)
std::ios_base& right( std::ios_base& str ); (2)
std::ios_base& internal( std::ios_base& str ); (3)

Modifies the default positioning of the fill characters. left and right apply to any output, internal applies to integer, floating-point, and monetary output. Has no effect on input.
1) sets the adjustfield of the stream str to left as if by calling str.setf(std::ios_base::left, std::ios_base::adjustfield)
2) sets the adjustfield of the stream str to right as if by calling str.setf(std::ios_base::right, std::ios_base::adjustfield)
3) sets the adjustfield of the stream str to internal as if by calling str.setf(std::ios_base::internal, std::ios_base::adjustfield)
This is an I/O manipulator. It may be called with an expression such as out << std::left for any out of type std::basic_ostream or with an expression such as in >> std::left for any in of type std::basic_istream.

Parameters

str - reference to I/O stream

Return value

str (reference to the stream after manipulation)

Example

// Run this code

  #include <iostream>
  #include <iomanip>
  #include <locale>

  int main()
  {
      std::cout.imbue(std::locale("en_US.utf8"));
      std::cout << "Left fill:\n" << std::left << std::setfill('*')
                << std::setw(12) << -1.23 << '\n'
                << std::setw(12) << std::hex << std::showbase << 42 << '\n'
                << std::setw(12) << std::put_money(123, true) << "\n\n";

      std::cout << "Internal fill:\n" << std::internal
                << std::setw(12) << -1.23 << '\n'
                << std::setw(12) << 42 << '\n'
                << std::setw(12) << std::put_money(123, true) << "\n\n";

      std::cout << "Right fill:\n" << std::right
                << std::setw(12) << -1.23 << '\n'
                << std::setw(12) << 42 << '\n'
                << std::setw(12) << std::put_money(123, true) << '\n';
  }

Output:

  Left fill:
  -1.23*******
  0x2a********
  USD *1.23***

  Internal fill:
  -*******1.23
  0x********2a
  USD ****1.23

  Right fill:
  *******-1.23
  ********0x2a
  ***USD *1.23