Customization point object (since C++20)
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Standard library 
 
 
 Customization point object (C++20)
 Exposition-only entities
(C++11)
(C++20)(C++20)
[edit] Explanation
The name cpo denotes a customization point object, which is a const function object of a literal semiregular class type. See CustomizationPointObject for details.
[edit] See also
- RangeAdaptorObject (RAO)
- RangeAdaptorClosureObject (RACO)