json/api/basic_json/default_object_comparator_t.md

nlohmann::basic_json::default_object_comparator_t

using default_object_comparator_t = std::less<StringType>;  // until C++14

using default_object_comparator_t = std::less<>;            // since C++14

The default comparator used by object_t.

Since C++14 a transparent comparator is used which prevents unnecessary string construction when looking up a key in an object.

The actual comparator used depends on object_t and can be obtained via object_comparator_t.

Examples

??? example

The example below demonstrates the default comparator.

```cpp
--8<-- "examples/default_object_comparator_t.cpp"
```

Output:

```json
--8<-- "examples/default_object_comparator_t.output"
```

Version history

• Added in version 3.11.0.