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Showing content from https://en.cppreference.com/w/cpp/language/../numeric/../named_req/BinaryPredicate.html below:

C++ named requirements: BinaryPredicate - cppreference.com

BinaryPredicate is a set of requirements expected by some of the standard library facilities from the user-provided arguments.

Given a BinaryPredicate bin_pred and a pair of iterators iter1 and iter2 or an iterator iter and a (possibly const) value value, the type and value category of the expression bin_pred(*iter1, *iter2) or, respectively, bin_pred(*iter, value), must meet the BooleanTestable requirements.

In addition, evaluation of that expression is not allowed to call non-const member functions of the dereferenced iterators; syntactically, the predicate must accept const object arguments, with the same behavior regardless of whether its arguments are const or non-const.

[edit] Requirements [edit] Standard library

The following standard library facilities expect a BinaryPredicate which isn't a Compare type.

removes consecutive duplicate elements
(public member function of std::forward_list<T,Allocator>) [edit] removes consecutive duplicate elements
(public member function of std::list<T,Allocator>) [edit] finds the last sequence of elements in a certain range
(function template) [edit] searches for any one of a set of elements
(function template) [edit] finds the first two adjacent items that are equal (or satisfy a given predicate)
(function template) [edit] finds the first position where two ranges differ
(function template) [edit] determines if two sets of elements are the same
(function template) [edit] determines if a sequence is a permutation of another sequence
(function template) [edit] searches for the first occurrence of a range of elements
(function template) [edit] searches for the first occurrence of a number consecutive copies of an element in a range
(function template) [edit] removes consecutive duplicate elements in a range
(function template) [edit] creates a copy of some range of elements that contains no consecutive duplicates
(function template) [edit]

(deprecated in C++17)(removed in C++20)

constructs custom std::binary_negate object
(function template) [edit] collection of unique keys, hashed by keys
(class template) [edit] collection of key-value pairs, hashed by keys, keys are unique
(class template) [edit] collection of keys, hashed by keys
(class template) [edit] collection of key-value pairs, hashed by keys
(class template) [edit] [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 2114
(P2167R3) C++98 convertibility of return types to bool was too weak
to reflect the expectation of implementations requirements strengthened LWG 3031 C++98 requirements on const values were insufficent requirements strengthened

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