ceph/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/doc/mkdocs/docs/api/basic_json/type.md

   1 # <small>nlohmann::basic_json::</small>type
   2
   3 ```cpp
   4 constexpr value_t type() const noexcept;
   5 ```
   6
   7 Return the type of the JSON value as a value from the [`value_t`](value_t.md) enumeration.
   8
   9 ## Return value
  10
  11 the type of the JSON value
  12
  13 | Value type                | return value               |
  14 |---------------------------|----------------------------|
  15 | `#!json null`             | `value_t::null`            |
  16 | boolean                   | `value_t::boolean`         |
  17 | string                    | `value_t::string`          |
  18 | number (integer)          | `value_t::number_integer`  |
  19 | number (unsigned integer) | `value_t::number_unsigned` |
  20 | number (floating-point)   | `value_t::number_float`    |
  21 | object                    | `value_t::object`          |
  22 | array                     | `value_t::array`           |
  23 | binary                    | `value_t::binary`          |
  24 | discarded                 | `value_t::discarded`       |
  25
  26 ## Exception safety
  27
  28 No-throw guarantee: this member function never throws exceptions.
  29
  30 ## Complexity
  31
  32 Constant.
  33
  34 ## Examples
  35
  36 ??? example
  37
  38     The following code exemplifies `type()` for all JSON types.
  39
  40     ```cpp
  41     --8<-- "examples/type.cpp"
  42     ```
  43
  44     Output:
  45
  46     ```json
  47     --8<-- "examples/type.output"
  48     ```
  49
  50 ## Version history
  51
  52 - Added in version 1.0.0.
  53 - Added unsigned integer type in version 2.0.0.
  54 - Added binary type in version 3.8.0.