Request: Object.at() with default return value

[Getfree]

On many implementations of dictionary-like structures, we have an at/get method that works like this:
Object.at("key",defaultValue)
i.e. if there's no key "key", then this would return defaultValue.

Could we have something similar in this library?

Here is a possible implementation:

template<typename returnType>
returnType at(const typename object_t::key_type& key, const returnType& _default){
	if( is_object() ){
		JSON_TRY{
			return m_value.object->at(key) ;
		}
		JSON_CATCH( std::out_of_range& ){
			return _default ;
		}
	}else{
		JSON_THROW(std::domain_error("cannot use at() with " + type_name()));
	}
}

Usage example:

json js ;
js.at("key", 5) ; // "key" is expected to hold something convertible to `int`, otherwise 5 is returned

[nlohmann]

Have a look at the value function.

[Getfree]

You mean the iterator's value() method?
That method doesn't take any optional arguments.

[nlohmann]

See https://nlohmann.github.io/json/classnlohmann_1_1basic__json_af9c51328fbe1da75eca750be3009917a.html#af9c51328fbe1da75eca750be3009917a

[Getfree]

Oh, that's great. I missed that one completely. I couldn't find it in anywhere in the documentation.

[Getfree]

Let's change this request to:
"Add json.value() to the list in https://nlohmann.github.io/json/"

[nlohmann]

Thanks for the hint. I mentioned the value function on the documentation main page.