Boost Json Translation (zh_Hans)/Doc / Pages / Conversion / Context (adoc)

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17 :117

	English In this snippet `time_point` is converted using `tag_invoke` overload that takes `as_iso_8601`, `ip_address` is converted using `tag_invoke` overload that takes `as_string`, and {std_vector} is converted using a generic conversion provided by the library. 255/10000 · 255
18 :122

	English Contexts and Composite Types 28/10000 · 28
19 :123

	English As was shown previously, generic conversions provided by the library forward contexts to conversions of nested objects. And in the case when you want to provide your own conversion function for a composite type enabled by a particular context, you usually also need to do that. 277/10000 · 277
20 :128

	English Consider this example. As was discussed in a previous section, <<ref_is_map_like>> requires that your key type satisfies <<ref_is_string_like>>. Now, let's say your keys are not string-like, but they do convert to <<ref_string>>. You can make such maps to also convert to objects using a context. But if you want to also use another context for values, you need a way to pass the full combined context to map elements. So, you want the following test to succeed. 462/10000 · 462
21 :141

	English For this you will have to use a different overload of `tag_invoke`. This time it has to be a function template, and it should have two parameters for contexts. The first parameter is the specific context that disambiguates that particular overload. The second parameter is the full context passed to <<ref_value_to>> or <<ref_value_from>>. 339/10000 · 339
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