std::num_get<CharT,InputIt>::~num_get
From cppreference.com
| Defined in header <locale>
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protected: ~num_get();
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Destructs a std::num_get facet. This destructor is protected and virtual (due to base class destructor being virtual). An object of type std::num_get, 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::num_get and implements a public destructor.
Example
Run this code
#include <iostream>
#include <locale>
struct Destructible_num_get : public std::num_get<wchar_t>
{
Destructible_num_get(std::size_t refs = 0) : num_get(refs) {}
// note: the implicit destructor is public
};
int main()
{
Destructible_num_get dc;
// std::num_get<wchar_t> c; // compile error: protected destructor
}
