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Advances the current position of the controlled input sequence to the next character, and returns that next character.
Notice that, although similar, the following member functions have different behaviors:
Internally, the function first calls sbumpc, and if that function returns a valid character, the function then calls sgetc. This only calls virtual members if, at some point, there are no read positions available at the get pointer (gptr).
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 the input file.
Concurrent access to the same stream buffer object may introduce data races.
Invalid arguments cause undefined behavior.
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
- snextc
public member function
<streambuf> <iostream>
std::streambuf::snextc
int snextc();
Advance to next position and get 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 first calls sbumpc, and if that function returns a valid character, the function then calls sgetc. This only calls virtual members if, at some point, there are no read positions available at the get pointer (gptr).
Its behavior is the same as if implemented as:
|
|
Parameters
noneReturn Value
The character at the next 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 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).Invalid arguments cause undefined behavior.
See also
- streambuf::sbumpc
- Get current character and advance to next position (public member function)
- streambuf::sgetc
- Get current character (public member function)
- streambuf::sgetn
- Get sequence of characters (public member function)
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Spotted an error? contact us