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value_ref

The type used in initializer lists.

Synopsis

Defined in header <boost/json/value_ref.hpp>

class value_ref
Member Functions

Name

Description

value_ref [constructor]

Constructor.

Description

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.

Example

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)
    {
    }
};
Remarks

Never declare a variable of type std::initializer_list except in function parameter lists, otherwise the behavior may be undefined.

See Also

value, array, object

Convenience header <boost/json.hpp>


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