std::basic_stringbuf<CharT,Traits,Allocator>::overflow

 

C++

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Input/output library

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C-style I/O

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basic_streambuf

basic_filebuf

basic_stringbuf

basic_spanbuf (C++23)

strstreambuf (C++98/26*)

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basic_osyncstream (C++20)

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std::basic_stringbuf

Public member functions

basic_stringbuf::basic_stringbuf

basic_stringbuf::operator= (C++11)

basic_stringbuf::swap (C++11)

basic_stringbuf::str

basic_stringbuf::get_allocator (C++20)

basic_stringbuf::view (C++20)

Protected member functions

basic_stringbuf::underflow

basic_stringbuf::pbackfail

basic_stringbuf::overflow

basic_stringbuf::setbuf

basic_stringbuf::seekoff

basic_stringbuf::seekpos

Non-member functions

swap(std::basic_stringbuf) (C++11)

Exposition-only member functions

basic_stringbuf::init_buf_ptrs

 

protected: virtual int_type overflow( int_type c = Traits::eof() );

Appends the character c to the output character sequence.

If c is the end-of-file indicator (traits::eq_int_type(c, traits::eof()) == true), then there is no character to append. The function does nothing and returns an unspecified value other than traits::eof().

Otherwise, if the output sequence has a write position available or this function can successfully make a write position available, then calls sputc(c) and returns c.

This function can make a write position available if the std::stringbuf is open for output ((mode & ios_base::out) != 0): in this case, it reallocates (or initially allocates) the buffer big enough to hold the entire current buffer plus at least one more character. If the std::stringbuf is also open for input ((mode & ios_base::in) != 0), then overflow also increases the size of the get area by moving egptr() to point just past the new write position.