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Return true if a memory resource's deallocate function has no effect.
        Defined in header <boost/json/memory_resource.hpp>
      
template< class T> struct is_deallocate_trivial
| Name | Description | 
|---|---|
| 
                  A bool equal to true if calls to  | 
        This metafunction may be specialized to indicate to the library that calls
        to the deallocate function
        of a memory_resource have no effect.
        The implementation will elide such calls when it is safe to do so. By default,
        the implementation assumes that all memory resources require a call to deallocate for each memory region obtained
        by calling allocate.
      
        This example specializes the metafuction for my_resource,
        to indicate that calls to deallocate have no effect:
      
// Forward-declaration for a user-defined memory resource struct my_resource; // It is necessary to specialize the template from // inside the namespace in which it is declared: namespace boost { namespace json { template<> struct is_deallocate_trivial< my_resource > { static constexpr bool value = true; }; } // namespace json } // namespace boost
        It is usually not necessary for users to check this trait. Instead, they
        can call storage_ptr::is_deallocate_trivial to determine
        if the pointed-to memory resource has a trivial deallocate function.
      
        Convenience header <boost/json.hpp>