public member function
<locale>
std::codecvt::always_noconv
int always_noconv() const throw();
int always_noconv() const noexcept;
Return noconv characteristics
Returns whether conversions between the internal and external types, in either direction, always yield a copy without any real conversion.
If this function returns true for a particular type of codecvt, then its members codecvt::in and codecvt::out always return codecvt_base::noconv.
Internally, this function simply calls the virtual protected member do_always_noconv, which behaves as described above by default.
Example
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// codecvt::always_noconv example
#include <iostream> // std::cout, std::boolalpha
#include <locale> // std::locale, std::codecvt, std::use_facet
int main ()
{
std::locale loc;
std::cout << std::boolalpha;
std::cout << "always_noconv for codecvt<char,char,mbstate_t>: ";
std::cout << std::use_facet<std::codecvt<char,char,mbstate_t> >(loc).always_noconv();
std::cout << '\n';
std::cout << "always_noconv for codecvt<wchar_t,char,mbstate_t>: ";
std::cout << std::use_facet<std::codecvt<wchar_t,char,mbstate_t> >(loc).always_noconv();
std::cout << '\n';
return 0;
}
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Output:
always_noconv for codecvt<char,char,mbstate_t>: true
always_noconv for codecvt<wchar_t,char,mbstate_t>: false
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Data races
The facet object is accessed.
Exception safety
No-throw guarantee: never throws exceptions.