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mirror of https://github.com/nlohmann/json.git synced 2025-07-29 23:01:16 +03:00

📝 add more API documentation

This commit is contained in:
Niels Lohmann
2020-08-16 14:27:26 +02:00
parent d8ed98a7af
commit fb5c20134f
9 changed files with 133 additions and 11 deletions

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@ -73,8 +73,9 @@ constexpr const PointerType get_ptr() const noexcept;
`PointerType`
: pointer type; must be a pointer to [`array_t`](array_t.md), [`object_t`](object_t.md), [`string_t`](string_t.md),
[`boolean_t`](boolean_t.md), [`number_integer_t`](number_integer_t.md), or [`number_unsigned`](number_unsigned.md),
[`number_float_t`](number_float_t.md), or [`binary_t`](binary_t.md). Other types will not compile.
[`boolean_t`](boolean_t.md), [`number_integer_t`](number_integer_t.md), or
[`number_unsigned_t`](number_unsigned_t.md), [`number_float_t`](number_float_t.md), or [`binary_t`](binary_t.md).
Other types will not compile.
## Return value

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@ -14,8 +14,9 @@ Implicit pointer access to the internally stored JSON value. No copies are made.
`PointerType`
: pointer type; must be a pointer to [`array_t`](array_t.md), [`object_t`](object_t.md), [`string_t`](string_t.md),
[`boolean_t`](boolean_t.md), [`number_integer_t`](number_integer_t.md), or [`number_unsigned`](number_unsigned.md),
[`number_float_t`](number_float_t.md), or [`binary_t`](binary_t.md). Other types will not compile.
[`boolean_t`](boolean_t.md), [`number_integer_t`](number_integer_t.md), or
[`number_unsigned_t`](number_unsigned_t.md), [`number_float_t`](number_float_t.md), or [`binary_t`](binary_t.md).
Other types will not compile.
## Return value

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@ -15,7 +15,7 @@ Implicit reference access to the internally stored JSON value. No copies are mad
`ReferenceType`
: reference type; must be a reference to [`array_t`](array_t.md), [`object_t`](object_t.md),
[`string_t`](string_t.md), [`boolean_t`](boolean_t.md), [`number_integer_t`](number_integer_t.md), or
[`number_unsigned`](number_unsigned.md), [`number_float_t`](number_float_t.md), or [`binary_t`](binary_t.md).
[`number_unsigned_t`](number_unsigned_t.md), [`number_float_t`](number_float_t.md), or [`binary_t`](binary_t.md).
Enforced by static assertion.
## Return value

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@ -0,0 +1,58 @@
# basic_json::get_to
```cpp
template<typename ValueType>
ValueType& get_to(ValueType& v) const noexcept(
noexcept(JSONSerializer<ValueType>::from_json(
std::declval<const basic_json_t&>(), v)))
```
Explicit type conversion between the JSON value and a compatible value. The value is filled into the input parameter by
calling the `json_serializer<ValueType>` `from_json()` method.
The function is equivalent to executing
```cpp
ValueType v;
JSONSerializer<ValueType>::from_json(*this, v);
```
This overloads is chosen if:
- `ValueType` is not `basic_json`,
- `json_serializer<ValueType>` has a `from_json()` method of the form `void from_json(const basic_json&, ValueType&)`
## Template parameters
`ValueType`
: the value type to return
## Return value
the input parameter, allowing chaining calls
## Exceptions
Depends on what `json_serializer<ValueType>` `from_json()` method throws
## Example
??? example
The example below shows several conversions from JSON values to other types. There a few things to note: (1)
Floating-point numbers can be converted to integers, (2) A JSON array can be converted to a standard
`#!cpp std::vector<short>`, (3) A JSON object can be converted to C++ associative containers such as
`#cpp std::unordered_map<std::string, json>`.
```cpp
--8<-- "examples/get_to.cpp"
```
Output:
```json
--8<-- "examples/get_to.output"
```
## Version history
- Since version 3.3.0.

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@ -33,14 +33,14 @@ class basic_json;
| -------------------- | ----------- | ------------ |
| `ObjectType` | type for JSON objects | [`object_t`](object_t.md) |
| `ArrayType` | type for JSON arrays | [`array_t`](array_t.md) |
| `StringType` | type for JSON strings and object keys | `string_t` |
| `BooleanType` | type for JSON booleans | `boolean_t` |
| `StringType` | type for JSON strings and object keys | [`string_t`](string_t.md) |
| `BooleanType` | type for JSON booleans | [`boolean_t`](boolean_t.md) |
| `NumberIntegerType` | type for JSON integer numbers | [`number_integer_t`](number_integer_t.md) |
| `NumberUnsignedType` | type for JSON unsigned integer numbers | [`number_unsigned_t`](number_unsigned_t.md) |
| `NumberFloatType` | type for JSON floating-point numbers | [`number_float_t`](number_float_t.md) |
| `AllocatorType` | type of the allocator to use | |
| `JSONSerializer` | the serializer to resolve internal calls to `to_json()` and `from_json()` | |
| `BinaryType` | type for binary arrays | `binary_t` |
| `JSONSerializer` | the serializer to resolve internal calls to `to_json()` and `from_json()` | [`json_serializer`](json_serializer.md) |
| `BinaryType` | type for binary arrays | [`binary_t`](binary_t.md) |
## Iterator invalidation
@ -48,9 +48,10 @@ Todo
## Member types
- [**adl_serializer**](../adl_serializer.md) - the default serializer
- [**value_t**](value_t.md) - the JSON type enumeration
- [**json_pointer**](../json_pointer.md) - JSON Pointer implementation
- json_serializer
- [**json_serializer**](json_serializer.md) - type of the serializer to for conversions from/to JSON
- [**error_handler_t**](error_handler_t.md) - type to choose behavior on decoding errors
- [**cbor_tag_handler_t**](cbor_tag_handler_t.md) - type to choose how to handle CBOR tags
- initializer_list_t
@ -136,7 +137,7 @@ Functions to inspect the type of a JSON value.
Direct access to the stored value of a JSON value.
- [**get**](get.md) - get a value
- get_to - get a value
- [**get_to**](get_to.md) - get a value and write it to a destination
- [**get_ptr**](get_ptr.md) - get a pointer value
- [**get_ref**](get_ref.md) - get a reference value
- [**operator ValueType**](operator_ValueType.md) - get a value

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@ -0,0 +1,24 @@
# basic_json::json_serializer
```cpp
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_json` functions
`SFINAE`
: type to add compile type checks via SFINAE; usually `#!cpp void`
## Notes
#### Default type
The default values for `json_serializer` is [`adl_serializer`](../adl_serializer.md).
## Version history
- Since version 2.0.0.