NAME¶

std::wstring_convert::~wstring_convert - std::wstring_convert::~wstring_convert

Synopsis¶

~wstring_convert();

Destroys the wstring_convert object and deletes the pointer to the conversion facet.

Notes¶

Some implementations are able to delete any facet, including the locale-specific
facets with protected destructors. Other implementations require the facet to have a
public destructor, similar to the locale-independent facets from <codecvt>. This is
LWG issue 721

Example¶

// Run this code

#include <locale>
#include <utility>
#include <codecvt>

// utility wrapper to adapt locale-bound facets for wstring/wbuffer convert
template<class Facet>
struct deletable_facet : Facet
{
template<class ...Args>
deletable_facet(Args&& ...args) : Facet(std::forward<Args>(args)...) {}
~deletable_facet() {}
};

int main()
{
// GB18030 / UCS4 conversion, using locale-based facet directly
// typedef std::codecvt_byname<char32_t, char, std::mbstate_t> gbfacet_t;
// Compiler error: "calling a protected destructor of codecvt_byname<> in ~wstring_convert"
// std::wstring_convert<gbfacet_t> gbto32(new gbfacet_t("zh_CN.gb18030"));

// GB18030 / UCS4 conversion facet using a facet with public destructor
typedef deletable_facet<std::codecvt_byname<char32_t, char, std::mbstate_t>> gbfacet_t;
std::wstring_convert<gbfacet_t> gbto32(new gbfacet_t("zh_CN.gb18030"));
} // destructor called here