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@@ -75,13 +75,49 @@ functions [`is_null`](is_null.md), [`is_object`](is_object.md), [`is_array`](is_
The following code how `type()` queries the `value_t` for all JSON types.
```cpp
--8<-- "examples/type.cpp"
#include <iostream>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
// create JSON values
json j_null;
json j_boolean = true;
json j_number_integer = -17;
json j_number_unsigned = 42u;
json j_number_float = 23.42;
json j_object = {{"one", 1}, {"two", 2}};
json j_array = {1, 2, 4, 8, 16};
json j_string = "Hello, world";
// call type()
std::cout << std::boolalpha;
std::cout << (j_null.type() == json::value_t::null) << '\n';
std::cout << (j_boolean.type() == json::value_t::boolean) << '\n';
std::cout << (j_number_integer.type() == json::value_t::number_integer) << '\n';
std::cout << (j_number_unsigned.type() == json::value_t::number_unsigned) << '\n';
std::cout << (j_number_float.type() == json::value_t::number_float) << '\n';
std::cout << (j_object.type() == json::value_t::object) << '\n';
std::cout << (j_array.type() == json::value_t::array) << '\n';
std::cout << (j_string.type() == json::value_t::string) << '\n';
}
```
Output:
```json
--8<-- "examples/type.output"
true
true
true
true
true
true
true
true
```
## See also