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Returns the number of characters extracted by the last unformatted input operation performed on the object.
The unformatted input operations that modify the value returned by this function are: get, getline, ignore, peek, read, readsome, putback and unget.
Notice though, that peek, putback and unget do not actually extract any characters, and thus gcount will always return zero after calling any of them.
streamsize is a signed integral type.
Possible output:
Concurrent access to the same stream object may cause data races.
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)
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-
<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>
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<forward_list>C++11
- <list>
- <map>
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- <stack>
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<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
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<condition_variable>C++11
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<future>C++11
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<mutex>C++11
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<thread>C++11
-
Other:
- <algorithm>
- <bitset>
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<chrono>C++11
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<codecvt>C++11
- <complex>
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<initializer_list>C++11
- <iterator>
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- <locale>
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<random>C++11
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<ratio>C++11
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<regex>C++11
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<system_error>C++11
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<istream>
class templates
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basic_istream
- basic_istream::~basic_istream
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member classes
member functions
non-member overloads
protected members
-
basic_istream::operator=C++11
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basic_istream::swapC++11
-
- Reference
- <istream>
- basic_istream
- gcount
public member function
<istream> <iostream>
std::basic_istream::gcount
streamsize gcount() const;
Get character count
The unformatted input operations that modify the value returned by this function are: get, getline, ignore, peek, read, readsome, putback and unget.
Notice though, that peek, putback and unget do not actually extract any characters, and thus gcount will always return zero after calling any of them.
Parameters
noneReturn Value
The number of characters extracted by the last unformatted input operation.streamsize is a signed integral type.
Example
|
|
Possible output:
Please, enter a word: simplify 9 characteres read: simplify |
Data races
Accesses the stream object.Concurrent access to the same stream object may cause data races.
Exception safety
Strong guarantee: if an exception is thrown, there are no changes in the stream.See also
- basic_istream::get
- Get characters (public member function)
- basic_istream::getline
- Get line (public member function)
- basic_istream::ignore
- Extract and discard characters (public member function)
- basic_istream::read
- Read block of data (public member function)
- basic_istream::readsome
- Read data available in buffer (public member function)
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