std::indirect_binary_predicate

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Iterator library
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Indirect callable concepts
indirect_binary_predicate
(C++20)
Common algorithm requirements
Utilities
(C++20)
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(C++11)
(C++11)
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(C++11)(C++14)
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(C++17)(C++20)
(C++14)(C++14)
(C++14)(C++14)
(C++17)
(C++17)
 
Defined in header <iterator>
(since C++20)

The concept indirect_binary_predicate specifies requirements for algorithms that call binary predicates as their arguments. The key difference between this concept and std::predicate is that it is applied to the types that I1 and I2 references, rather than I1 and I2 themselves.

Semantic requirements

F, I1, and I2 model indirect_binary_predicate only if all concepts it subsumes are modeled.