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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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10
doc/mkdocs/docs/api/basic_json/basic_json.md
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@@ -201,16 +201,16 @@ basic_json(basic_json&& other) noexcept;
## Exceptions
1. /
1. (none)
2. The function does not throw exceptions.
3. /
4. /
3. (none)
4. (none)
5. The function can throw the following exceptions:
- Throws [`type_error.301`](../../home/exceptions.md#jsonexceptiontype_error301) if `type_deduction` is
`#!cpp false`, `manual_type` is `value_t::object`, but `init` contains an element which is not a pair whose first
element is a string. In this case, the constructor could not create an object. If `type_deduction` would have been
`#!cpp true`, an array would have been created. See `object(initializer_list_t)` for an example.
6. /
6. (none)
7. The function can throw the following exceptions:
- Throws [`invalid_iterator.201`](../../home/exceptions.md#jsonexceptioninvalid_iterator201) if iterators `first`
and `last` are not compatible (i.e., do not belong to the same JSON value). In this case, the range
@@ -220,7 +220,7 @@ basic_json(basic_json&& other) noexcept;
element anymore. In this case, the range `[first, last)` is undefined. See example code below.
- Throws [`invalid_iterator.206`](../../home/exceptions.md#jsonexceptioninvalid_iterator206) if iterators `first`
and `last` belong to a `#!json null` value. In this case, the range `[first, last)` is undefined.
8. /
8. (none)
9. The function does not throw exceptions.
## Complexity