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Move UDLs out of the global namespace (#3605)

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* Move UDLs into nlohmann::literals::json_literals namespace

* Add 'using namespace' to unit tests

* Add 'using namespace' to examples

* Add 'using namespace' to README

* Move UDL mkdocs pages out of basic_json/

* Update documentation

* Update docset index

* Add JSON_GlobalUDLs CMake option

* Add unit test

* Build examples without global UDLs

* Add CI target
This commit is contained in:
Florian Albrechtskirchinger
2022-07-31 17:38:52 +02:00
committed by GitHub
parent 8fd8b52907
commit 9aafcbe965
61 changed files with 377 additions and 94 deletions
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8
README.md
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@@ -148,6 +148,7 @@ json ex1 = json::parse(R"(
)");
// Using user-defined (raw) string literals
using namespace nlohmann::literals;
json ex2 = R"(
{
"pi": 3.141,
@@ -262,7 +263,12 @@ auto j2 = R"(
)"_json;
```
Note that without appending the `_json` suffix, the passed string literal is not parsed, but just used as JSON string value. That is, `json j = "{ \"happy\": true, \"pi\": 3.141 }"` would just store the string `"{ "happy": true, "pi": 3.141 }"` rather than parsing the actual object.
Note that without appending the `_json` suffix, the passed string literal is not parsed, but just used as JSON string
value. That is, `json j = "{ \"happy\": true, \"pi\": 3.141 }"` would just store the string
`"{ "happy": true, "pi": 3.141 }"` rather than parsing the actual object.
The string literal should be brought into scope with with `using namespace nlohmann::literals;`
(see [`json::parse()`](https://json.nlohmann.me/api/operator_literal_json/)).
The above example can also be expressed explicitly using [`json::parse()`](https://json.nlohmann.me/api/basic_json/parse/):