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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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File “doc/pages/conversion/alloc_zh_Hans.adoc” was added. 06/05/2026
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To avoid creating such temporaries with an incorrect {ref_memory_resource}, using <<ref_value>>'s member functions <<ref_value_emplace_array>>, <<ref_value_emplace_object>>, and <<ref_value_emplace_string>> can be helpful.
To avoid creating such temporaries with an incorrect {ref_memory_resource}, using <<ref_value>>'s member functions <<ref_value_emplace_array>>, <<ref_value_emplace_object>>, and <<ref_value_emplace_string>> can be helpful.
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This implementation explicitly creates an <<ref_array>> rather than relying on assignment from an initializer list. But the array uses default {ref_memory_resource}, not the one used by `jv`.
This implementation explicitly creates an <<ref_array>> rather than relying on assignment from an initializer list. But the array uses default {ref_memory_resource}, not the one used by `jv`.
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``` void tag_invoke( const value_from_tag&, value& jv, ip_address const& addr ) { jv = array{ b[0], b[1], b[2], b[3] }; } ```
``` void tag_invoke( const value_from_tag&, value& jv, ip_address const& addr ) { jv = array{ b[0], b[1], b[2], b[3] }; } ```
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For example, consider this alternative implementation of `tag_invoke` for `ip_address` from the section <<custom_conversions>>.
For example, consider this alternative implementation of `tag_invoke` for `ip_address` from the section <<custom_conversions>>.
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As the conversion result is set via an output parameter of type `value&`, the intended <<ref_storage_ptr>> is correctly propagated. But users still should take care to not create temporaries using the default {ref_memory_resource} by accident.
As the conversion result is set via an output parameter of type `value&`, the intended <<ref_storage_ptr>> is correctly propagated. But users still should take care to not create temporaries using the default {ref_memory_resource} by accident.
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<<ref_value_to>> does not have a similar parameter, as <<ref_value>> is not created.
<<ref_value_to>> does not have a similar parameter, as <<ref_value>> is not created.
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= Allocation Control As <<ref_value_from>> creates a <<ref_value>> object, users may want to control the way memory is allocated for it. For this reason the function has an optional <<ref_storage_ptr>> parameter, that is used to set the {ref_memory_resource} for the result.
= Allocation Control As <<ref_value_from>> creates a <<ref_value>> object, users may want to control the way memory is allocated for it. For this reason the function has an optional <<ref_storage_ptr>> parameter, that is used to set the {ref_memory_resource} for the result.
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File “doc/pages/conversion/forward_zh_Hans.adoc” was added. 06/05/2026
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Forward declarations of contextual conversions are done very similarly:
Forward declarations of contextual conversions are done very similarly:
06/05/2026

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