std::wbuffer_convert<Codecvt,Elem,Tr>::rdbuf

 

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

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Text processing library

Localization library

Regular expressions library (C++11)

Formatting library (C++20)

Null-terminated sequence utilities

Byte strings

Multibyte strings

Wide strings

Primitive numeric conversions

to_chars (C++17) to_chars_result (C++17) from_chars (C++17) from_chars_result (C++17) chars_format (C++17)

Text encoding identifications

text_encoding (C++26)

 

Localization library

Locales and facets   Locales has_facet use_facet locale Facet category base classes ctype_base codecvt_base messages_base time_base money_base ctype facets ctype ctype<char> ctype_byname codecvt codecvt_byname numeric facets num_get num_put numpunct numpunct_byname collate facets collate collate_byname time facets time_get time_put time_get_byname time_put_byname

monetary facets money_get money_put moneypunct moneypunct_byname messages facets messages messages_byname Character classification and conversion Character classification isspace    iscntrl isupper islower    isalpha ispunct isdigit    isxdigit isalnum isblank (C++11) isprint isgraph Character conversions toupper    tolower String and stream conversions wstring_convert (C++11/17/26*) wbuffer_convert (C++11/17/26*) Unicode conversion facets codecvt_utf8 (C++11/17/26*) codecvt_utf16 (C++11/17/26*) codecvt_utf8_utf16 (C++11/17/26*) codecvt_mode (C++11/17/26*) C library locales LC_ALLLC_COLLATELC_CTYPELC_MONETARYLC_NUMERICLC_TIME    setlocale localeconv lconv

 

std::wbuffer_convert

Member functions

wbuffer_convert::wbuffer_convert

wbuffer_convert::~wbuffer_convert

wbuffer_convert::rdbuf

wbuffer_convert::state

 

std::streambuf* rdbuf() const;	(1)
std::streambuf* rdbuf( std::streambuf* bytebuf );	(2)

1) Returns the pointer to the underlying byte stream.

2) Replaces the associated byte stream with bytebuf.

Return value

1) bufptr

2) the previous value of bufptr

Example

Run this code

#include <codecvt>
#include <iostream>
#include <locale>
#include <sstream>
 
int main()
{
    / Convert UTF-8 to UCS4
    std::stringbuf utf8buf("z\u00df\u6c34\U0001d10b");
                       / or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b"
                       / or u8"zß水𝄋"
    std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv(&utf8buf);
    std::wistream ucsbuf(&conv);
    std::cout << "Reading from a UTF-8 stringbuf via wbuffer_convert: "
              << std::hex << std::showbase;
    for (wchar_t c; ucsbuf.get(c);)
        std::cout << static_cast<std::wint_t>(c) << ' ';
 
    / Reuse the same wbuffer_convert to handle UCS4 to UTF-8 output
    conv.rdbuf(std::cout.rdbuf();
    std::wostream out(&conv);
    std::cout << "\nSending UCS4 data to std::cout via wbuffer_convert: ";
    out << L"z\u00df\u6c34\U0001d10b\n";
}

Output:

Reading from a UTF-8 stringbuf via wbuffer_convert: 0x7a 0xdf 0x6c34 0x1d10b 
Sending UCS4 data to std::cout via wbuffer_convert: zß水𝄋

See also

(constructor)

constructs a new wbuffer_convert (public member function)

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