iomanip

<iomanip>

Include the iostreams standard header <iomanip> to define several manipulators that each take a single argument. Each of these manipulators returns an unspecified type, called T1 through T6 here, that overloads both istream::operator>> and ostream::operator<<. Thus, you can write extractors and inserters such as:

cin >> setbase(8);
cout << setbase(8);

        // DECLARATIONS
T1 resetiosflags(ios_base::fmtflags mask);
T2 setiosflags(ios_base::fmtflags mask);
T3 setbase(int base);
T4 setfill(char ch);
T5 setprecision(streamsize prec);
T6 setw(streamsize wide);
        // END OF DECLARATIONS

resetiosflags

T1 resetiosflags(ios_base::fmtflags mask);

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.setf(ios_base:: fmtflags(), mask), then returns str.

setbase

T3 setbase(int base);

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.setf(mask, ios_base::basefield), then returns str. Here, mask is determined as follows:

• If base is 8, then mask is ios_base::oct
• If base is 10, then mask is ios_base::dec
• If base is 16, then mask is ios_base::hex
• If base is any other value, then mask is ios_base::fmtflags(0)

setfill

T4 setfill(char ch);

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.fill(ch), then returns str.

setiosflags

T2 setiosflags(ios_base::fmtflags mask);

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.setf(mask), then returns str.

setprecision

T5 setprecision(streamsize prec);

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.precision(prec), then returns str.

setw

T6 setw(streamsize wide);

The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.width(wide), then returns str.

See also the Table of Contents and the Index.

Copyright © 1992-2002 by P.J. Plauger. All rights reserved.