Boost Json Translation (zh_Hans)/Doc / Pages / Dom / Value (adoc)

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110 :224

	English 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: 255/10000 · 255
111 :234

	English 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. 332/10000 · 332
112 :240

	English 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: 302/10000 · 302
113 :263

	English Functions returning {ref_result} allow you to use both approaches: 66/10000 · 66
114 :270

	English Formatted Output 16/10000 · 16
115 :271

	English When a <<ref_value>> is formatted to a {std_ostream}, the result is serialized JSON as if by calling <<ref_serialize>>. 119/10000 · 119
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