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Implement support for string_view (attempt no. 3) (#3423)

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* Add key_compare member to ordered_map

* Replace == with key_compare in ordered_map

* Expose the actual comparison function used by object_t

nlohmann::ordered_map uses a different comparison function than the one
provided via template parameter.
* Introduce a type trait to detect if object_t has a key_compare member.
* Rename object_comparator_t to default_object_comparator_t.
* Add object_comparator_t to be conditionally defined as
  object_t::key_compare, if available, or default_object_comparator_t
  otherwise.
* Update the documentation accordingly.

Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com>

* Add type traits to check if a type is usable as object key

Add type trait to check:
* if a type is a specialization of a template.
* if a type is a json_pointer.
* if a type is a basic_json::{const_,}iterator.
* if two types are comparable using a given comparison functor.
* if a type is comparable to basic_json::object_t::key_type.
* if a type has a member type is_transparent.
* if a type is usable as object key.
* if a type has an erase() function accepting a given KeyType.

Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com>

* Rework basic_json element access to accept more key types

Rework basic_json element access member functions and operators to
accept any type that meets the requirements defined by type trait
detail::is_usable_as_key_type.

Member functions and operators:
* at()
* operator[]
* value()
* erase()
* find()
* count()
* contains()

Update documentation to reflect these changes.

Add unit tests to excercise the new functions using std::string_view.

Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com>

Co-authored-by: Niels Lohmann <niels.lohmann@gmail.com>
This commit is contained in:
Florian Albrechtskirchinger
2022-04-29 21:40:02 +02:00
committed by GitHub
parent ee51661481
commit 5352856f04
26 changed files with 1517 additions and 305 deletions
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7
doc/mkdocs/docs/api/ordered_map.md
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@@ -32,6 +32,12 @@ A minimal map-like container that preserves insertion order for use within [`nlo
- **const_iterator**
- **size_type**
- **value_type**
- **key_compare** - key comparison function
```cpp
std::equal_to<Key> // until C++14
std::equal_to<> // since C++14
```
## Member functions
@@ -68,3 +74,4 @@ A minimal map-like container that preserves insertion order for use within [`nlo
## Version history
- Added in version 3.9.0 to implement [`nlohmann::ordered_json`](ordered_json.md).
- Added **key_compare** member in version 3.11.0.