std::ctype<CharT>::~ctype
From cppreference.com
| Defined in header <locale>
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| protected: ~ctype(); |
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Destructs a std::ctype facet. This destructor is protected and virtual (due to base class destructor being virtual). An object of type std::ctype, like most facets, can only be destroyed when the last std::locale object that implements this facet goes out of scope or if a user-defined class is derived from std::ctype and implements a public destructor.
Example
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#include <iostream> #include <locale> struct Destructible_ctype : public std::ctype<wchar_t> { Destructible_ctype(std::size_t refs = 0) : ctype(refs) {} // note: the implicit destructor is public }; int main() { Destructible_ctype dc; // std::ctype<wchar_t> c; // compile error: protected destructor }