json/doc/mkdocs/docs/api/macros/json_use_implicit_conversions.md

JSON_USE_IMPLICIT_CONVERSIONS

#define JSON_USE_IMPLICIT_CONVERSIONS /* value */

When defined to 0, implicit conversions are switched off. By default, implicit conversions are switched on.

Implicit conversions can also be controlled with the CMake option JSON_ImplicitConversions (ON by default) which sets JSON_USE_IMPLICIT_CONVERSIONS accordingly.

Default definition

By default, implicit conversions are enabled

#define JSON_USE_IMPLICIT_CONVERSIONS 1

Examples

??? 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:

```cpp
json j = "Hello, world!";
auto s = j.get<std::string>();
```

Version history

• Added in version 3.9.0.