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Niels Lohmann
52b72b5684
- Make the iterator range illustrations legible in dark mode (prefers-color-scheme rules inside the SVGs). - Add a "Byte layout" section with a color-coded byte table to each binary format page (BJData, BON8, BSON, CBOR, MessagePack, UBJSON), and highlight the smallest size per file in the comparison table. - Add "See also" sections to the overview pages that lacked one. - Split the release notes into one page per release, grouped by minor version on the overview page, with an "API changes" section per release generated from the API pages' version histories (hooks/api_changes.py). - Fact-check the release notes and version histories against the release tags and correct wrong or misleading entries (e.g., json_serializer 2.1.0, merge_patch 3.1.0, items, count, operator[], to_bjdata, std::string_view key support). Signed-off-by: Niels Lohmann <mail@nlohmann.me>
1.6 KiB
1.6 KiB
nlohmann::basic_json::json_serializer
template<typename T, typename SFINAE>
using json_serializer = JSONSerializer<T, SFINAE>;
Template parameters
T- type to convert; will be used in the
to_json/from_jsonfunctions SFINAE- type to add compile type checks via SFINAE; usually
#!cpp void
Notes
Default type
The default values for json_serializer is adl_serializer.
Requirements
A custom serializer must provide #!cpp static void to_json(basic_json&, T) for every type it serializes, and either
#!cpp static void from_json(const basic_json&, T&) or #!cpp static T from_json(const basic_json&) for every type it
deserializes. See Template Parameter Requirements.
Examples
??? example
The example below shows how a conversion of a non-default-constructible type is implemented via a specialization of
the `adl_serializer`.
```cpp
--8<-- "examples/from_json__non_default_constructible.cpp"
```
Output:
```json
--8<-- "examples/from_json__non_default_constructible.output"
```
See also
- adl_serializer the default
json_serializer - get explicit type conversion using the
json_serializer'sfrom_json()method - get_to explicit type conversion into a variable using the
json_serializer'sfrom_json()method - Arbitrary Type Conversions - the article on converting between JSON values and arbitrary types
Version history
- Added in version 2.1.0.