operator<< (std::basic_string_view)

Behaves as a FormattedOutputFunction . After constructing and checking the sentry object, determines the output format padding .

Then stores each character from the resulting sequence seq (the contents of v with padding) to the output stream os as if by calling os. rdbuf ( ) - > sputn ( seq, n ) , where n is std:: max ( os. width ( ) , str. size ( ) ) .

Finally, calls os. width ( 0 ) to cancel the effects of std::setw , if any.

Exceptions

May throw std::ios_base::failure if an exception is thrown during output.

Parameters

Return value

os

Example

#include <iomanip>
#include <iostream>
#include <string_view>
 
int main()
{
    constexpr std::string_view s{"abc"};
    constexpr int width{5};
 
    // fill/left/right properties are kept until changed
    std::cout << std::setfill('-');
    std::cout << std::left;
 
    std::cout << '[' << std::setw(width) << s << "]\n";
    std::cout << '[' << std::setw(width) << s << "]\n";
 
    std::cout << std::right;
    std::cout << '[' << std::setw(width) << s << "]\n";
 
    // width is reset after each call
    std::cout << '[' << s << "]\n";
}

[abc--]
[abc--]
[--abc]
[abc]

See also