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File “doc/pages/dom/value_zh_Hans.adoc” was added. 06/05/2026
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When a <<ref_value>> is formatted to a {std_ostream}, the result is serialized JSON as if by calling <<ref_serialize>>.
When a <<ref_value>> is formatted to a {std_ostream}, the result is serialized JSON as if by calling <<ref_serialize>>.
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Formatted Output
Formatted Output
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Functions returning {ref_result} allow you to use both approaches:
Functions returning {ref_result} allow you to use both approaches:
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We can query a value for its underlying representation of a particular kind in a way that does not throw exceptions by requesting a pointer which may be null, instead of a reference. Here we use <<ref_value_if_string,`value::if_string`>> to conditionally perform an assignment without using exceptions:
We can query a value for its underlying representation of a particular kind in a way that does not throw exceptions by requesting a pointer which may be null, instead of a reference. Here we use <<ref_value_if_string,`value::if_string`>> to conditionally perform an assignment without using exceptions:
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However, as shown above these functions throw an exception if the kind in the <<ref_value>> does not match the kind denoted by the function signature. This can be used as a concise form of validation: access values as if they were the right type, but handle the resulting exception indicating if the schema of the JSON is not valid.
However, as shown above these functions throw an exception if the kind in the <<ref_value>> does not match the kind denoted by the function signature. This can be used as a concise form of validation: access values as if they were the right type, but handle the resulting exception indicating if the schema of the JSON is not valid.
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If the <<ref_kind>> of a <<ref_value>> is known, functions such as <<ref_value_as_bool,`value::as_bool`>> or <<ref_value_as_string,`value::as_string`>> may be used to obtain a reference to the underlying representation without changing the existing value:
If the <<ref_kind>> of a <<ref_value>> is known, functions such as <<ref_value_as_bool,`value::as_bool`>> or <<ref_value_as_string,`value::as_string`>> may be used to obtain a reference to the underlying representation without changing the existing value:
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The return value from emplace can be used to perform assignment or to capture a reference to the underlying element for later inspection or modification:
The return value from emplace can be used to perform assignment or to capture a reference to the underlying element for later inspection or modification:
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^| &mdash; | A monostate value representing null. |===
^| &mdash; | A monostate value representing null. |===
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<<ref_kind,`kind::null`>>
<<ref_kind,`kind::null`>>
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A `bool` holding `true` or `false`.
A `bool` holding `true` or `false`.
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https://en.cppreference.com/w/cpp/keyword/bool[`bool`]
https://en.cppreference.com/w/cpp/keyword/bool[`bool`]
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<<ref_kind,`kind::bool_`>>
<<ref_kind,`kind::bool_`>>
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A `double` holding a floating-point value.
A `double` holding a floating-point value.
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`double`
`double`
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<<ref_kind,`kind::double_`>>
<<ref_kind,`kind::double_`>>
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A 64 bit unsigned integer.
A 64 bit unsigned integer.
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`std::uint64_t`
`std::uint64_t`
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<<ref_kind,`kind::uint64`>>
<<ref_kind,`kind::uint64`>>
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A 64 bit signed integer.
A 64 bit signed integer.
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