Exit Zen
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The member function <<ref_value_kind,`value::kind`>> may be used to query the kind stored in the value. Alternatively, member functions like <<ref_value_is_object,`value::is_object`>> <<ref_value_is_number,`value::is_number`>> may be used to check whether or not the value is a particular kind:
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Name
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The memory resource is passed by pointer; ownership is not transferred. The caller is responsible for extending the lifetime of the memory resource until the last container which is using it goes out of scope, otherwise the behavior is undefined. Sometimes this is the correct model, such as in this example which uses a monotonic resource constructed from a local stack buffer:
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A stateful DOM parser object which may be used to efficiently parse a series
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A counted memory resource will not be destroyed until every container with shared ownership of the resource is destroyed.
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*rapidjson*
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{icon_bad} Limited allocator support. Only stateless allocators are allowed,
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instances of <<ref_value>>, <<ref_array>>, <<ref_object>>, or <<ref_string>>. |===
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https://en.cppreference.com/w/cpp/types/is_arithmetic[Arithmetic type]
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Matrix
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A special variant which can hold one of any of the six standard JSON data
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a `std::string` parameter, or
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This `tag_invoke` overload lets us change date conversion format at runtime. Also note, that there is no ambiguity between `as_iso_8601` overload and `date_format` overload. You can use both in your program:
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``` void tag_invoke( const value_from_tag&, value&, T ); ```
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As with `std::pair`, the <<ref_key_value_pair>> type can be used with structured bindings in {cpp}17. Specializations of `std::tuple_size`, `std::tuple_element`, and overloads of <<ref_get>> are all provided for this purpose.
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Functions like <<ref_value_if_object,`value::if_object`>> actually return a pointer to the object if the value is an object, otherwise they return null. This allows them to be used both in boolean contexts as above, and in assignments or conditional expressions to capture the value of the pointer:
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Description
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However, sometimes shared ownership is needed. Specifically, that the lifetime extension of the memory resource should be automatic. For example, if a library wants to return a container which owns an instance of the library's custom memory resource as shown below:
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of JSON texts each contained in a single contiguous character buffer, returning each result as a <<ref_value>>.
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Parsing
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