Customization point object (since C++20)
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.
See also
- RangeAdaptorObject (RAO)
- RangeAdaptorClosureObject (RACO)
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https://en.cppreference.com/cpp/ranges/cpo
