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Niels Lohmann
0adb7783a4
Give basic_json_view the read-only access functions of basic_json: operator[] and at() with keys and indices, front()/back(), find(), contains(), count(), begin()/end() and cbegin()/cend(), items() with structured bindings from C++17 on, and type_name(). Exceptions have the ids and messages of the const functions of basic_json. Where basic_json has undefined behavior the view answers safely: operator[] with a missing key or an out-of-range index returns a discarded view, and front()/back() of an empty container throw invalid_iterator.214. Objects are iterated in document order, and all members are visited; duplicate-key lookups find the first member (as yyjson and simdjson do), while parse(), materialize(), and the map conversions keep the last value, as parse() does. Keys of up to 16 bytes are compared with two overlapping loads. Add value conversions: get<T>()/get_to() for arithmetic types, bool, nullptr_t, strings (std::basic_string copied, string_view_t without a copy), BasicJsonType, views, std::vector, and maps with string keys; get_string() for the string without a copy; number_token() for the number exactly as written in the source; value() with keys and JSON pointers; and operator[]/at()/ contains() with JSON pointers. Everything else, including types with from_json(), goes through materialize() of that subtree. get<T>() of arithmetic types is inlined down to the conversion, so reading an integer needs no call. detail::json_pointer_access exposes a pointer's reference tokens to code outside basic_json. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
1.0 KiB
1.0 KiB
nlohmann::basic_json::cend
const_iterator cend() const noexcept;
Returns an iterator to one past the last element.
Return value
iterator one past the last element
Exception safety
No-throw guarantee: this member function never throws exceptions.
Complexity
Constant.
Examples
??? example
The following code shows an example for `cend()`.
```cpp
--8<-- "examples/cend.cpp"
```
Output:
```json
--8<-- "examples/cend.output"
```
See also
- end returns an iterator to one past the last element
- cbegin returns a const iterator to the first element
- crend returns a const reverse iterator to one before the first element
- Iterators - the article on iterators
- basic_json_view::cend - the same iteration on a zero-copy view
Version history
- Added in version 1.0.0.