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Add 'using namespace' to README

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Florian Albrechtskirchinger 2022-07-25 15:24:19 +02:00
parent ae980ce527
commit afdee85921
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@ -148,6 +148,7 @@ json ex1 = json::parse(R"(
)"); )");
// Using user-defined (raw) string literals // Using user-defined (raw) string literals
using namespace nlohmann::literals;
json ex2 = R"( json ex2 = R"(
{ {
"pi": 3.141, "pi": 3.141,
@ -262,7 +263,12 @@ auto j2 = R"(
)"_json; )"_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/basic_json/operator_literal_json/)).
The above example can also be expressed explicitly using [`json::parse()`](https://json.nlohmann.me/api/basic_json/parse/): The above example can also be expressed explicitly using [`json::parse()`](https://json.nlohmann.me/api/basic_json/parse/):