This commit is contained in:
nlohmann committed 2026-10-12 07:35:31 +00:00
1 parent 79119509a9
commit 22fba27145
555 files changed
+17342 -1394

No files matched your search

+48 -2
View File
@@ -38,13 +38,59 @@ Constant.
The following code exemplifies `operator value_t()` for all JSON types.
```cpp
--8<-- "examples/operator__value_t.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 operator value_t()
json::value_t t_null = j_null;
json::value_t t_boolean = j_boolean;
json::value_t t_number_integer = j_number_integer;
json::value_t t_number_unsigned = j_number_unsigned;
json::value_t t_number_float = j_number_float;
json::value_t t_object = j_object;
json::value_t t_array = j_array;
json::value_t t_string = j_string;
// print types
std::cout << std::boolalpha;
std::cout << (t_null == json::value_t::null) << '\n';
std::cout << (t_boolean == json::value_t::boolean) << '\n';
std::cout << (t_number_integer == json::value_t::number_integer) << '\n';
std::cout << (t_number_unsigned == json::value_t::number_unsigned) << '\n';
std::cout << (t_number_float == json::value_t::number_float) << '\n';
std::cout << (t_object == json::value_t::object) << '\n';
std::cout << (t_array == json::value_t::array) << '\n';
std::cout << (t_string == json::value_t::string) << '\n';
}
```
Output:
```json
--8<-- "examples/operator__value_t.output"
true
true
true
true
true
true
true
true
```
## See also