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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
1.3 KiB
1.3 KiB
nlohmann::operator""_json
json operator "" _json(const char* s, std::size_t n);
This operator implements a user-defined string literal for JSON objects. It can be used by adding #!cpp _json to a
string literal and returns a json object if no parse error occurred.
Use any of the following lines to bring the operator into scope:
using namespace nlohmann::literals;
using namespace nlohmann::json_literals;
using namespace nlohmann::literals::json_literals;
using namespace nlohmann;
Alternatively, define JSON_USE_GLOBAL_UDLS to make them available in the global
namespace.
Parameters
s(in)- a string representation of a JSON object
n(in)- length of string
s
Return value
json value parsed from s
Exceptions
The function can throw anything that parse(s, s+n) would throw.
Complexity
Linear.
Examples
??? example
The following code shows how to create JSON values from string literals.
```cpp
--8<-- "examples/operator_literal_json.cpp"
```
Output:
```json
--8<-- "examples/operator_literal_json.output"
```
Version history
- Added in version 1.0.0.
- Moved to namespace
nlohmann::literals::json_literalsin 3.11.0.