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Add macros NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT and ..._NON_INTRUSIVE_WITH_DEFAULT (#3143)

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* Added new macros NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT.

* Updated docs for NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT accordingly

* Rephrased docs for NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT

* Updated docs for NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT and NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT

* Renamed default_obj in to avoid name clashes

* Added test for serialization of default constructed object

* Add const to getters for macro tests

Co-authored-by: Chaoya Li <harry75369@gmail.com>
This commit is contained in:
pketelsen
2022-01-30 22:06:50 +01:00
committed by GitHub
parent c11f98228d
commit eec79d4e8a
5 changed files with 145 additions and 12 deletions
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12
doc/mkdocs/docs/features/macros.md
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@ -186,12 +186,12 @@ When defined to `0`, implicit conversions are switched off. By default, implicit
??? example
This is an example for an implicit conversion:
```cpp
json j = "Hello, world!";
std::string s = j;
```
When `JSON_USE_IMPLICIT_CONVERSIONS` is defined to `0`, the code above does no longer compile. Instead, it must be
written like this:
@ -220,6 +220,10 @@ The first parameter is the name of the class/struct, and all remaining parameter
See [Simplify your life with macros](arbitrary_types.md#simplify-your-life-with-macros) for an example.
## `NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT(type, member...)`
This macro is similar to `NLOHMANN_DEFINE_TYPE_INTRUSIVE`. It will not throw an exception in `from_json()` due to a missing value in the JSON object, but can throw due to a mismatched type. In order to support that it requires that the type be default constructible. The `from_json()` function default constructs an object and uses its values as the defaults when calling the `value()` function.
## `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(type, member...)`
This macro can be used to simplify the serialization/deserialization of types if (1) want to use a JSON object as
@ -231,6 +235,10 @@ first parameter is the name of the class/struct, and all remaining parameters na
See [Simplify your life with macros](arbitrary_types.md#simplify-your-life-with-macros) for an example.
## `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(type, member...)`
This macro is similar to `NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE`. It will not throw an exception in `from_json()` due to a missing value in the JSON object, but can throw due to a mismatched type. In order to support that it requires that the type be default constructible. The `from_json()` function default constructs an object and uses its values as the defaults when calling the `value()` function.
## `NLOHMANN_JSON_SERIALIZE_ENUM(type, ...)`
This macro simplifies the serialization/deserialization of enum types. See