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nlohmann
2026-10-02 15:15:16 +00:00
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api/macros/json_use_global_udls/index.html
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api/macros/json_use_global_udls/index.md
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@@ -14,7 +14,7 @@ The default value is `1`.
#define JSON_USE_GLOBAL_UDLS 1
```
When the macro is not defined, the library will define it to its default value.
When the macro is not defined, the library behaves as if it were defined to its default value.
## Notes
@@ -28,6 +28,10 @@ CMake option
The placement of user-defined string literals can also be controlled with the CMake option [`JSON_GlobalUDLs`](https://json.nlohmann.me/integration/cmake/#json_globaludls) (`ON` by default) which defines `JSON_USE_GLOBAL_UDLS` accordingly.
Leaving out the literals
If [`JSON_NO_AUTOMATIC_UDLS`](https://json.nlohmann.me/api/macros/json_no_automatic_udls/index.md) is defined, the literals are only declared where `<nlohmann/json_literals.hpp>` is included; this macro then applies to that header.
## Examples
Example 1: Default behavior
@@ -87,6 +91,7 @@ Output:
- [`operator""_json`](https://json.nlohmann.me/api/operator_literal_json/index.md)
- [`operator""_json_pointer`](https://json.nlohmann.me/api/operator_literal_json_pointer/index.md)
- [`JSON_NO_AUTOMATIC_UDLS`](https://json.nlohmann.me/api/macros/json_no_automatic_udls/index.md) - do not include the user-defined string literals automatically
- [JSON_GlobalUDLs](https://json.nlohmann.me/integration/cmake/#json_globaludls) - CMake option to control the macro
## Version history