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###### value::if_object (2 of 2 overloads)

Return an `object` pointer if this is an object, else return `nullptr`

###### Synopsis

    object*
    if_object();

###### Description

If `this->kind() == kind::object`, returns a pointer to the underlying object. Otherwise, returns `nullptr`.

###### Example

The return value is used in both a boolean context and to assign a variable:

    if ( auto p = jv.if_object() )
        return *p;

###### Complexity

Constant.

###### Exception Safety

No-throw guarantee.