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Returns the character at the current position of the controlled input sequence, and advances the position indicator to the next character.
Notice that, although similar, the following member functions have different behaviors:
Internally, the function calls the virtual protected member uflow if there are no read positions available at the get pointer (gptr). Otherwise, the function uses the get pointer (gptr) directly, without calling virtual member functions.
Its behavior is the same as if implemented as:
If there are no more characters to read from the controlled input sequence, the function returns the end-of-file value (
Member type int_type is an integral type able to represent any character value or the special end-of-file value.
This example shows the content of a file on screen, using the combination of sgetc and sbumpc to sequentially read the input file.
Concurrent access to the same stream buffer object may introduce 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)
- <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>
basic_streambuf
- basic_streambuf::~basic_streambuf
- basic_streambuf::basic_streambuf
public members
- basic_streambuf::getloc
- basic_streambuf::in_avail
- basic_streambuf::pubimbue
- basic_streambuf::pubseekoff
- basic_streambuf::pubseekpos
- basic_streambuf::pubsetbuf
- basic_streambuf::pubsync
- basic_streambuf::sbumpc
- basic_streambuf::sgetc
- basic_streambuf::sgetn
- basic_streambuf::snextc
- basic_streambuf::sputbackc
- basic_streambuf::sputc
- basic_streambuf::sputn
- basic_streambuf::sungetc
protected members
virtual protected members
- Reference
- <streambuf>
- basic_streambuf
- sbumpc
public member function
<streambuf> <iostream>
std::basic_streambuf::sbumpc
int_type sbumpc();
Get current character and advance to next position
Notice that, although similar, the following member functions have different behaviors:
| member function | description |
|---|---|
sgetc() | returns the character at the current position. |
sbumpc() | returns the character at the current position and advances the current position to the next character. |
snextc() | advances the current position to the next character and returns this next character. |
Internally, the function calls the virtual protected member uflow if there are no read positions available at the get pointer (gptr). Otherwise, the function uses the get pointer (gptr) directly, without calling virtual member functions.
Its behavior is the same as if implemented as:
|
|
Return Value
The character at the current position of the controlled input sequence before the call, converted to a value of type int_type using member traits_type::to_int_type.If there are no more characters to read from the controlled input sequence, the function returns the end-of-file value (
traits_type::eof()).Member type int_type is an integral type able to represent any character value or the special end-of-file value.
Example
|
|
This example shows the content of a file on screen, using the combination of sgetc and sbumpc to sequentially read the input file.
Data races
Modifies the stream buffer object.Concurrent access to the same stream buffer object may introduce data races.
Exception safety
Basic guarantee: if an exception is thrown, the stream buffer is in a valid state (this also applies to standard derived classes).See also
- basic_streambuf::snextc
- Advance to next position and get character (public member function)
- basic_streambuf::sgetc
- Get current character (public member function)
- basic_streambuf::sgetn
- Get sequence of characters (public member function)
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Spotted an error? contact us