std::setfill

When used in an expression out << setfill(c) sets the fill character of the stream out to c

Parameters

Return value

An object of unspecified type such that

• if out is an object of type std::basic_ostream<CharT, Traits> , the expression out << setfill(c)
  • has type std::basic_ostream <CharT, Traits> &
  • has value out
  • behaves as if it called f(out, c)

where the function f is defined as:

template<class CharT, class Traits>
void f(std::basic_ios<CharT, Traits>& str, CharT c)
{
    // set fill character
    str.fill(c);
}

Notes

The current fill character may be obtained with std::ostream::fill.

Example

#include <iomanip>
#include <iostream>
 
int main()
{
    std::cout << "default fill: [" << std::setw(10) << 42 << "]\n"
              << "setfill('*'): [" << std::setfill('*')
                                   << std::setw(10) << 42 << "]\n";
}

default fill: [        42]
setfill('*'): [********42]

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

See also