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
.
str | - | reference to I/O stream |
str
(reference to the stream after manipulation).
#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
clears the specified ios_base flags (function) |
|
sets the specified ios_base flags (function) |
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