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Returns the character at the current position of the controlled input sequence, without modifying the current position.
Notice that, although similar, the following member functions have different behaviors:
Internally, the function calls the virtual protected member underflow 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 (EOF).
This example shows the content of a file on screen, using the combination of sgetc and snextc to read a 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>
streambuf
- streambuf::~streambuf
- streambuf::streambuf
public members
protected members
virtual protected members
- Reference
- <streambuf>
- streambuf
- sgetc
public member function
<streambuf> <iostream>
std::streambuf::sgetc
int sgetc();
Get current character
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 underflow 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:
|
|
Parameters
noneReturn Value
The character at the current position of the controlled input sequence, as a value of typeint.If there are no more characters to read from the controlled input sequence, the function returns the end-of-file value (EOF).
Example
|
|
This example shows the content of a file on screen, using the combination of sgetc and snextc to read a 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
- streambuf::snextc
- Advance to next position and get character (public member function)
- streambuf::sbumpc
- Get current character and advance to next position (public member function)
- streambuf::sgetn
- Get sequence of characters (public member function)
- streambuf::sputc
- Store character at current put position and increase put pointer (public member function)
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Spotted an error? contact us