Difference between revisions of "cpp/named req/ConstexprIterator"
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| − | {{cpp/ | + | {{cpp/named req/title|ConstexprIterator|notes={{mark since c++20}}}} |
| − | {{cpp/ | + | {{cpp/named req/navbar}} |
| − | A {{ | + | A {{named req|ConstexprIterator}} is a {{named req|Iterator}} that can be used during constant expression evaluation. |
===Requirements=== | ===Requirements=== | ||
| − | The type {{ | + | The type {{c|It}} satisfies {{named req/core|ConstexprIterator}} if |
| − | * The type {{ | + | * The type {{c|It}} satisfies some iterator requirements {{named req/core|MeowIterator}} |
And, for every | And, for every | ||
| − | * {{ | + | * {{c|purr}}, an operation on {{c|It}} that is required to be supported by {{named req/core|MeowIterator}}, |
| − | * {{ | + | * {{c|kittens...}}, a set of arguments to {{c|purr}} that meets the requirements for that operation, |
Then | Then | ||
| − | * {{ | + | * {{c|purr(kittens...)}} may be used in a constant expression if {{c|kittens...}} can also be used. |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
===Standard library=== | ===Standard library=== | ||
| + | The following standard library types are {{named req|ConstexprIterator}}s. | ||
| − | + | * {{ltt|cpp/container/array|array::iterator}} and {{ltt|cpp/container/array|array::const_iterator}}. | |
| − | + | ||
| − | + | ||
* {{ltt|cpp/string/basic_string_view|basic_string_view::iterator}}. | * {{ltt|cpp/string/basic_string_view|basic_string_view::iterator}}. | ||
| + | * {{ltt|cpp/container/span|span::iterator}}. | ||
| + | * {{ltt|cpp/container/vector|vector::iterator}} and {{ltt|cpp/container/vector|vector::const_iterator}}. | ||
| + | {{rrev|since=c++26| | ||
| + | * {{ltt|cpp/utility/optional|optional::iterator}} and {{ltt|cpp/utility/optional|optional::const_iterator}} | ||
| + | }} | ||
===See also=== | ===See also=== | ||
| − | + | {{dsc begin}} | |
| + | {{see_also_iterator_library}} | ||
| + | {{dsc end}} | ||
| + | |||
| + | {{langlinks|es|ja|ru|zh}} | ||
Latest revision as of 16:08, 25 August 2024
A ConstexprIterator is a LegacyIterator that can be used during constant expression evaluation.
[edit] Requirements
The type It satisfies ConstexprIterator if
- The type It satisfies some iterator requirements MeowIterator
And, for every
- purr, an operation on It that is required to be supported by MeowIterator,
- kittens..., a set of arguments to purr that meets the requirements for that operation,
Then
- purr(kittens...) may be used in a constant expression if kittens... can also be used.
[edit] Standard library
The following standard library types are ConstexprIterators.
- array::iterator and array::const_iterator.
- basic_string_view::iterator.
- span::iterator.
- vector::iterator and vector::const_iterator.
| (since C++26) |
[edit] See also
| Iterator library | provides definitions for iterators, iterator traits, adaptors, and utility functions |
