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nlohmann committed 2026-10-12 07:35:31 +00:00
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@@ -26,8 +26,7 @@ To store objects in C++, a type is defined by the template parameters described
`StringType`
: the type of the keys or names (e.g., `std::string`). The comparison function `std::less<StringType>` is used to
order elements inside the container. `object_t::key_type` must be implicitly convertible to `string_t` (required by the
binary formats).
order elements inside the container.
`AllocatorType`
: the allocator to use for objects (e.g., `std::allocator`)
@@ -115,13 +114,24 @@ the object is silently converted as an array of key-value pairs, which is incorr
The following code shows that `object_t` is by default, a typedef to `#!cpp std::map<json::string_t, json>`.
```cpp
--8<-- "examples/object_t.cpp"
#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>
using json = nlohmann::json;
int main()
{
std::cout << std::boolalpha << std::is_same<std::map<json::string_t, json>, json::object_t>::value << std::endl;
}
```
Output:
```json
--8<-- "examples/object_t.output"
true
```
## See also