Class template wbuffer_convert looks like a wide stream buffer, but performs all its I/O through an underlying byte stream buffer that you specify when you construct it. Like class template wstring_convert, it lets you specify a code conversion facet to perform the conversions, without affecting any streams or locales.
namespace std {
template <class Codecvt, class Elem = wchar_t, class Tr = char_traits<Elem>>
class wbuffer_convert : public basic_streambuf<Elem, Tr> {
public:
using state_type = typename Codecvt::state_type;
explicit wbuffer_convert(streambuf* bytebuf = 0,
Codecvt* pcvt = new Codecvt,
state_type state = state_type());
~wbuffer_convert();
wbuffer_convert(const wbuffer_convert&) = delete;
wbuffer_convert& operator=(const wbuffer_convert&) = delete;
streambuf* rdbuf() const;
streambuf* rdbuf(streambuf* bytebuf);
state_type state() const;
private:
streambuf* bufptr; Codecvt* cvtptr; state_type cvtstate; };
}
The class template describes a stream buffer that controls the transmission of elements of type Elem, whose character traits are described by the class Tr, to and from a byte stream buffer of type streambuf. Conversion between a sequence of Elem values and multibyte sequences is performed by an object of class Codecvt, which shall meet the requirements of the standard code-conversion facet codecvt<Elem, char, mbstate_t>.
An object of this class template stores:
bufptr — a pointer to its underlying byte stream buffer
cvtptr — a pointer to the allocated conversion object (which is freed when the wbuffer_convert object is destroyed)
cvtstate — a conversion state object
state_type state() const;
streambuf* rdbuf() const;
streambuf* rdbuf(streambuf* bytebuf);
Effects: Stores bytebuf in bufptr.
Returns: The previous value of bufptr.
using state_type = typename Codecvt::state_type;
The type shall be a synonym for Codecvt::state_type.
explicit wbuffer_convert( streambuf* bytebuf = 0, Codecvt* pcvt = new Codecvt, state_type state = state_type());
Requires: pcvt != nullptr.
Effects: The constructor constructs a stream buffer object, initializes bufptr to bytebuf, initializes cvtptr to pcvt, and initializes cvtstate to state.
~wbuffer_convert();
Effects: The destructor shall delete cvtptr.
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