mirror of
https://github.com/nlohmann/json.git
synced 2024-08-21 20:42:29 +02:00
22 lines
1.6 KiB
Markdown
22 lines
1.6 KiB
Markdown
|
# Reference
|
||
|
|
|
||
|
|
## Types and default values
|
||
|
|
|
||
|
|
| JSON type | value_type | C++ type | type alias | default value |
|
||
|
|
| ----------------------- | -------------------------- | ----------------------------- | ---------------------- | --------------
|
||
|
|
| null | `value_type::null` | `nullptr_t` | - | `nullptr` |
|
||
|
|
| string | `value_type::string` | `std::string` | `JSON::string_t` | `""` |
|
||
|
|
| number (integer) | `value_type::number` | `int` | `JSON::number_t` | `0` |
|
||
|
|
| number (floating point) | `value_type::number_float` | `double` | `JSON::number_float_t` | `0.0` |
|
||
|
|
| array | `value_type::array ` | `std::array<JSON>` | `JSON::array_t` | `{}` |
|
||
|
|
| object | `value_type::object` | `std::map<std::string, JSON>` | `JSON::object_t` | `{}` |
|
||
|
|
|
||
|
|
## Conversions
|
||
|
|
|
||
|
|
There are only a few type conversions possible:
|
||
|
|
|
||
|
|
- An integer number can be translated to a floating point number (e.g., by calling `get<double>()`).
|
||
|
|
- A floating pointnnumber can be translated to an integer number (e.g., by calling `get<int>()`). Note the number is truncated and not rounded, ceiled or floored.
|
||
|
|
- Any value but JSON objects can be translated into an array. The result is a singleton array that consists of the value before.
|
||
|
|
- Any other conversion will throw a `std::logic_error` exception.
|