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