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

Exit Zen

2 :17

	English The drawback of this approach is that fully custom type representations are not supported, only the library-provided conversions are. Also all objects that should be populated by parsing have to be default constructible types. This includes not only the top-level object, but e.g. elements of containers, members of described `struct`s, and alternatives of variants. 366/10000 · 366
3 :23

	English That being said, if your types are default-constructible and you don't need the customisability allowed by <<ref_value_to>> and <<ref_value_from>>, then you can get a significant performance boost with direct conversions. 221/10000 · 221
4 :27

	English Direct parsing is performed by the <<ref_parse_into>> family of functions. The library provides overloads that take either <<ref_string_view>> or `std::istream`, and can report errors either via throwing exceptions or setting an error code. 240/10000 · 240
5 :37

	English If you need to combine incremental parsing with direct parsing, you can resort to <<ref_parser_for>>. `parser_for<T>` is an instantiation of <<ref_basic_parser>> that parses into an object of type `T`, and is what <<ref_parse_into>> uses under the hood. 253/10000 · 253
6 :42

	English Direct serialization doesn't require any special components and works with the regular <<ref_serializer>> and <<ref_serialize>>. 128/10000 · 128
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