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