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2026-09-25 01:23:44 +00:00
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api/macros/json_use_implicit_conversions.md
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@@ -24,6 +24,14 @@ By default, implicit conversions are enabled.
You can prepare existing code by already defining `JSON_USE_IMPLICIT_CONVERSIONS` to `0` and replace any implicit
conversions with calls to [`get`](../basic_json/get.md).
!!! tip "Automatic migration"
The community-maintained clang-tidy check `modernize-nlohmann-json-explicit-conversions` rewrites implicit
conversions into explicit calls to [`get`](../basic_json/get.md); for example, `#!cpp int i = j;` becomes
`#!cpp int i = j.get<int>();`. The check is not part of clang-tidy itself, and it does not catch every case (for
example, constructing a `std::optional` from a JSON value), so review the result. See
[discussion #4610](https://github.com/nlohmann/json/discussions/4610) for how to build and use it.
!!! hint "CMake option"
Implicit conversions can also be controlled with the CMake option