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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:
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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A <<ref_value>> constructed from `nullptr` or default constructed represents a null JSON element:
A <<ref_value>> constructed from `nullptr` or default constructed represents a null JSON element:
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Working With Values
Working With Values
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https://en.wikipedia.org/wiki/Associative_array[__associative array__].
https://en.wikipedia.org/wiki/Associative_array[__associative array__].
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**object**: A collection of name/value pairs, also known as an
**object**: A collection of name/value pairs, also known as an
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**array**: An ordered list of values, like {std_vector}.
**array**: An ordered list of values, like {std_vector}.
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similar to {std_string}.
similar to {std_string}.
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**string**: A sequence of zero or more Unicode characters,
**string**: A sequence of zero or more Unicode characters,
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**number**: An integral or floating point value.
**number**: An integral or floating point value.
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**boolean**: A boolean: either `true` or `false`.
**boolean**: A boolean: either `true` or `false`.
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https://en.cppreference.com/w/cpp/utility/variant/monostate[__monostate__] value, equivalent to `nullptr`.
https://en.cppreference.com/w/cpp/utility/variant/monostate[__monostate__] value, equivalent to `nullptr`.
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**null**: A
**null**: A
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= `value` JSON documents are represented in memory as instances of <<ref_value>>: a {req_Regular} type which satisfies {req_DefaultConstructible}, {req_CopyConstructible}, {req_CopyAssignable}, {req_MoveConstructible}, {req_MoveAssignable}, and many of the requirements of allocator-aware containers. It is implemented as a https://en.wikipedia.org/wiki/Tagged_union[__variant__] internally, and can dynamically store any of the six defined JSON value types:
= `value` JSON documents are represented in memory as instances of <<ref_value>>: a {req_Regular} type which satisfies {req_DefaultConstructible}, {req_CopyConstructible}, {req_CopyAssignable}, {req_MoveConstructible}, {req_MoveAssignable}, and many of the requirements of allocator-aware containers. It is implemented as a https://en.wikipedia.org/wiki/Tagged_union[__variant__] internally, and can dynamically store any of the six defined JSON value types:
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Changes committed 06/05/2026

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