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Clears the skipws format flag for the str stream.
When the skipws format flag is not set, all operations on the stream consider initial whitespace characters as valid content to be extracted.
Tab spaces, carriage returns and blank spaces are all considered whitespaces (see isspace).
This flag can be set with the skipws manipulator. When set, as many initial whitespace characters as necessary are read and discarded from the stream until a non-whitespace character is found. This would apply to every formatted input operation performed with operator>> on the stream.
Notice that many extraction operations consider the whitespaces themselves as the terminating character, therefore, with the skipws flag disabled, some extraction operations may extract no characters at all from the stream.
For standard streams, the skipws flag is set on initialization.
Output:
Notice that in the first set of extractions, the leading spaces were ignored, while in the second they were extracted as valid characters.
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<ios>
types
manipulators
other functions
-
iostream_categoryC++11
-
function
<ios> <iostream>
std::noskipws
ios_base& noskipws (ios_base& str);
Do not skip whitespaces
When the skipws format flag is not set, all operations on the stream consider initial whitespace characters as valid content to be extracted.
Tab spaces, carriage returns and blank spaces are all considered whitespaces (see isspace).
This flag can be set with the skipws manipulator. When set, as many initial whitespace characters as necessary are read and discarded from the stream until a non-whitespace character is found. This would apply to every formatted input operation performed with operator>> on the stream.
Notice that many extraction operations consider the whitespaces themselves as the terminating character, therefore, with the skipws flag disabled, some extraction operations may extract no characters at all from the stream.
For standard streams, the skipws flag is set on initialization.
Parameters
- str
- Stream object whose format flag is affected.
Because this function is a manipulator, it is designed to be used alone with no arguments in conjunction with the insertion (<<) and extraction (>>) operations on streams (see example below).
Return Value
Argument str.Example
|
|
Output:
123 1 |
Notice that in the first set of extractions, the leading spaces were ignored, while in the second they were extracted as valid characters.
Data races
Modifies str. Concurrent access to the same stream object may cause data races.Exception safety
Basic guarantee: if an exception is thrown, str is in a valid state.See also
- skipws
- Skip whitespaces (function)
- ios_base::flags
- Get/set format flags (public member function)
- ios_base::setf
- Set specific format flags (public member function)
- ios_base::unsetf
- Clear specific format flags (public member function)
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Spotted an error? contact us