std::wbuffer_convert::wbuffer_convert
From cppreference.com
< cpp | locale | wbuffer convert
| wbuffer_convert() : wbuffer_convert(nullptr) { } |
(1) | |
| explicit wbuffer_convert( std::streambuf* bytebuf, Codecvt* pcvt = new Codecvt, |
(2) | |
| wbuffer_convert(const std::wbuffer_convert&) = delete; |
(3) | (since C++14) |
1) Default constructor.
2) Constructs the
wbuffer_convert object with the specified underlying byte stream, specified codecvt facet, and specified initial conversion state (all parameters are optional)Parameters
| bytebuf | - | pointer to std::streambuf to serve as the underlying narrow character stream |
| pcvt | - | pointer to a standalone (not managed by a locale) std::codecvt facet. The behavior is undefined if this pointer is null. |
| state | - | the initial value of the character conversion state |
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| P0935R0 | C++11 | default constructor was explicit | made implicit |
Example
Run this code
#include <iostream> #include <sstream> #include <locale> #include <codecvt> int main() { // wrap a UTF-8 string stream in a UCS4 wbuffer_convert std::stringbuf utf8buf(u8"z\u00df\u6c34\U0001f34c"); // or u8"zß水🍌" // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9f\x8d\x8c"; std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv_in(&utf8buf); std::wistream ucsbuf(&conv_in); std::cout << "Reading from a UTF-8 stringbuf via wbuffer_convert:\n"; for(wchar_t c; ucsbuf.get(c); ) std::cout << std::hex << std::showbase << c << '\n'; // wrap a UTF-8 aware std::cout in a UCS4 wbuffer_convert to output UCS4 std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv_out(std::cout.rdbuf()); std::wostream out(&conv_out); std::cout << "Sending UCS4 data to std::cout via wbuffer_convert:\n"; out << L"z\u00df\u6c34\U0001f34c\n"; }
Output:
Reading from a UTF-8 stringbuf via wbuffer_convert produces 0x7a 0xdf 0x6c34 0x1f34c Sending UCS4 data to std::cout via wbuffer_convert: zß水🍌