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nlohmann committed 2026-10-15 12:09:22 +00:00
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integration/compile_times/index.md
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@@ -8,7 +8,7 @@ The numbers below are medians of nine runs compiling a single translation unit w
## Include `json_fwd.hpp` in headers
Header files that only need to *name* the `json` type — for function declarations, members held by pointer or reference, or friend declarations — can include `<nlohmann/json_fwd.hpp>` instead of `<nlohmann/json.hpp>`. It only forward-declares `basic_json`, `json`, `ordered_json`, `json_pointer`, and `adl_serializer`. The translation units that actually use the values then include `<nlohmann/json.hpp>`.
Header files that only need to *name* the `json` type — for function declarations, members held by pointer or reference, or friend declarations — can include `<nlohmann/json_fwd.hpp>` instead of `<nlohmann/json.hpp>`. It only forward-declares `basic_json`, `json_pointer`, `adl_serializer`, and `ordered_map`, and defines the aliases `json` and `ordered_json`. The translation units that actually use the values then include `<nlohmann/json.hpp>`.
person.hpp