std::skipws, std::noskipws

 

C++

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Input/output manipulators

Floating-point formatting
showpoint noshowpoint setprecision	fixed scientific hexfloat defaultfloat (C++11) (C++11)
Integer formatting
setbase showbase noshowbase	dec hex oct
Boolean formatting
boolalpha noboolalpha
Field width and fill control
setfill setw	internal left right
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showpos noshowpos	uppercase nouppercase
Whitespace processing
ws ends	skipws noskipws
Output flushing
flush endl	unitbuf nounitbuf
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resetiosflags	setiosflags
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get_money (C++11) get_time (C++11)	put_money (C++11) put_time (C++11)

 

Defined in header <ios>
std::ios_base& skipws( std::ios_base& str );	(1)
std::ios_base& noskipws( std::ios_base& str );	(2)

Enables or disables skipping of leading whitespace by the formatted input functions (enabled by default). Has no effect on output.

1) enables the skipws flag in the stream str as if by calling str.setf(std::ios_base::skipws)

2) disables the skipws flag in the stream str as if by calling str.unsetf(std::ios_base::skipws)

The whitespace skipping is performed by the constructor of std::basic_istream::sentry, which reads and discards the characters classified as whitespace by the std::ctype facet of the stream's imbued locale.

This is an I/O manipulator, it may be called with an expression such as out << std::noskipws for any out of type std::basic_ostream or with an expression such as in >> std::noskipws 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

#include <iostream>
#include <sstream>
int main()
{
    char c1, c2, c3;
    std::istringstream("a b c") >> c1 >> c2 >> c3;
    std::cout << "Default  behavior: c1 = " << c1 << " c2 = " << c2 << " c3 = " << c3 << '\n';
    std::istringstream("a b c") >> std::noskipws >> c1 >> c2 >> c3;
    std::cout << "noskipws behavior: c1 = " << c1 << " c2 = " << c2 << " c3 = " << c3 << '\n';
}

Output:

Default  behavior: c1 = a c2 = b c3 = c
noskipws behavior: c1 = a c2 =   c3 = b

See also

resetiosflags	clears the specified ios_base flags (function)
setiosflags	sets the specified ios_base flags (function)