std::wstring_convert<Codecvt,Elem,Wide_alloc,Byte_alloc>::wstring_convert
wstring_convert() : wstring_convert( new Codecvt ) { } |
(1) | |
explicit wstring_convert( Codecvt* pcvt ); |
(2) | |
wstring_convert( Codecvt* pcvt, state_type state); |
(3) | |
explicit wstring_convert( const byte_string& byte_err, const wide_string& wide_err = wide_string() ); |
(4) | |
wstring_convert(const std::wstring_convert&) = delete; |
(5) | (since C++14) |
1) Default constructor.
2) Constructs the
wstring_convert
object with a specified conversion facet, using default-constructed values for the shift state and the error strings
3) Constructs the
wstring_convert
object with a specified conversion facet and specified shift state, using default-constructed values for the error strings
4) Constructs the
wstring_convert
object with specified error strings, using
new Codecvt
as the conversion facet and the default-constructed
state_type
as shift state.
5) The copy constructor is deleted, wstring_convert is not
CopyConstructible
Parameters
pcvt | - | pointer to the conversion facet of type Codecvt (behavior is undefined if this pointer is null) |
state | - | initial value of the conversion shift state |
byte_err | - | narrow string to display on errors |
wide_err | - | wide string to display on errors |
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
#include <locale> #include <utility> #include <codecvt> // utility wrapper to adapt locale-bound facets for wstring/wbuffer convert template<class Facet> struct deletable_facet : Facet { using Facet::Facet; // inherit constructors ~deletable_facet() {} }; int main() { // UTF-16le / UCS4 conversion std::wstring_convert< std::codecvt_utf16<char32_t, 0x10ffff, std::little_endian> > u16to32; // UTF-8 / wide string conversion with custom messages std::wstring_convert<std::codecvt_utf8<wchar_t>> u8towide("Error!", L"Error!"); // GB18030 / wide string conversion facet typedef deletable_facet<std::codecvt_byname<wchar_t, char, std::mbstate_t>> F; std::wstring_convert<F> gbtowide(new F("zh_CN.gb18030")); }
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