std::basic_syncbuf<CharT,Traits,Allocator>::sync

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

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Metaprogramming library (C++11)

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Ranges library (C++20)

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Technical specifications

Symbols index

External libraries

 

Input/output library

I/O manipulators

Print functions (C++23)

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

basic_spanbuf (C++23)

strstreambuf (C++98/26*)

basic_syncbuf (C++20)

Streams

Abstractions

ios_base

basic_ios

basic_istream

basic_ostream

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basic_ifstream

basic_ofstream

basic_fstream

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basic_istringstream

basic_ostringstream

basic_stringstream

Array I/O

basic_ispanstream (C++23)

basic_ospanstream (C++23)

basic_spanstream (C++23)

istrstream (C++98/26*)

ostrstream (C++98/26*)

strstream (C++98/26*)

Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

streamsize

fpos

Error category interface

iostream_category (C++11)

io_errc (C++11)

 

std::basic_syncbuf

Public member functions

basic_syncbuf::basic_syncbuf (C++20)

basic_syncbuf::operator= (C++20)

basic_syncbuf::~basic_syncbuf (C++20)

basic_syncbuf::swap (C++20)

basic_syncbuf::emit (C++20)

basic_syncbuf::get_wrapped (C++20)

basic_syncbuf::get_allocator (C++20)

basic_syncbuf::set_emit_on_sync (C++20)

Protected member functions

basic_syncbuf::sync (C++20)

Non-member functions

swap(std::basic_syncbuf) (C++20)

 

protected: int sync() override;

First, records that a flush is pending, by updating the appropriate private flag.

Then, if the current emit-on-sync policy is true, makes a call to emit().

Otherwise (if the emit-on-sync policy is false, which is the default), the flush is suspended until emit() is called, such as through std::basic_osyncstream::emit() or std::basic_osyncstream::~basic_osyncstream

Parameters

(none)

Notes

sync() or its equivalent is implicitly called by close(), seekoff(), and seekpos() and explicitly called by std::basic_streambuf::pubsync()

See also

sync [virtual]	synchronizes the buffers with the associated character sequence (virtual protected member function of std::basic_streambuf<CharT,Traits>)
emit	calls emit() on the underlying basic_syncbuf to transmit its internal data to the final destination (public member function of std::basic_osyncstream<CharT,Traits,Allocator>)