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The type used in initializer lists.
        Defined in header <boost/json/value_ref.hpp>
      
class value_ref
| Name | Description | 
|---|---|
| value_ref [constructor] | Constructor. | 
        This type is used in initializer lists for lazy construction of and assignment
        to the container types value, array, and object. The two types of initializer
        lists used are:
      
        A value_ref uses reference
        semantics. Creation of the actual container from the initializer list is
        lazily deferred until the list is used. This means that the memory_resource used to construct
        a container can be specified after the point where the initializer list is
        specified.
      
This example demonstrates how a user-defined type containing a JSON value can be constructed from an initializer list:
class my_type { value jv_; public: my_type( std::initializer_list< value_ref > init ) : jv_(init) { } };
        Never declare a variable of type std::initializer_list
        except in function parameter lists, otherwise the behavior may be undefined.
      
        Convenience header <boost/json.hpp>