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Document options to reduce compile times (#5611)

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* Document options to reduce compile times

Add an integration page that collects the ways to reduce compile times
with measurements: json_fwd.hpp in headers, JSON_NO_AUTOMATIC_UDLS,
explicit instantiation with extern template, modules, and precompiled
headers, and notes that JSON_NO_IO and JSON_USE_GLOBAL_UDLS have no
measurable effect.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Include only json_literals.hpp in the JSON_NO_AUTOMATIC_UDLS examples

json_literals.hpp includes json.hpp itself, so including both is redundant.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-10-04 12:23:53 +02:00
1 parent 73e9eae3c1
commit 0c4462676d
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docs/mkdocs/docs/api/macros/json_no_automatic_udls.md
+2 -1
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@@ -43,9 +43,9 @@ By default, `#!cpp JSON_NO_AUTOMATIC_UDLS` is not defined, and `<nlohmann/json.h
```cpp
// compiled with -DJSON_NO_AUTOMATIC_UDLS for the whole project
#include <nlohmann/json.hpp>
// this file uses the literals, so it includes them explicitly
// (the header includes <nlohmann/json.hpp> itself)
#include <nlohmann/json_literals.hpp>
int main()
@@ -62,6 +62,7 @@ By default, `#!cpp JSON_NO_AUTOMATIC_UDLS` is not defined, and `<nlohmann/json.h
- [`operator""_json`](../operator_literal_json.md)
- [`operator""_json_pointer`](../operator_literal_json_pointer.md)
- [`JSON_USE_GLOBAL_UDLS`](json_use_global_udls.md) - place user-defined string literals (UDLs) into the global namespace
- [Compile times](../../integration/compile_times.md) - options to reduce compile times
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