Defined in header <locale>
id(const id&) = delete;

1) default constructor: creates an object of type std::locale::id with implementation-specific content.

2) copy constructor is deleted; std::locale::id is not copyable.


Because locales and facets must be available for the IO stream objects with static storage duration, such as std::cout, typical implementations let implicit default constructor zero-initialize the contents of std::locale::id during static initialization (before constructors run for static objects), and when a facet is added to any locale for the first time, the locale completes initialization of the facet's id.

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