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std::equal_to(3) C++ Standard Libary std::equal_to(3) NAME std::equal_to - std::equal_to Synopsis Defined in header <functional> template< class T > (until C++14) struct equal_to; template< class T = void > (since C++14) struct equal_to; Function object for performing comparisons. Unless specialised, in- vokes operator== on type T. Specializations The standard library provides a specialization of std::equal_to when T is not specified, which leaves the parameter types and return type to be deduced. (since C++14) equal_to<void> function object implementing x == y deducing argument (C++14) and return types (class template specialization) Member types Type Defini- tion result_type (deprecated in C++17)(removed in C++20) bool first_argument_type (deprecated in C++17)(removed in C++20) T second_argument_type (deprecated in C++17)(removed in C++20) T These member types are obtained via publicly inheriting (until C++11) std::binary_function<T, T, bool>. Member functions operator() checks if the arguments are equal (public member function) std::equal_to::operator() bool operator()( const T& lhs, const T& rhs ) const; (un- til C++14) constexpr bool operator()( const T& lhs, const T& rhs ) const; (since C++14) Checks whether lhs is equal to rhs. Parameters lhs, rhs - values to compare Return value true if lhs == rhs, false otherwise. Exceptions May throw implementation-defined exceptions. Possible implementation constexpr bool operator()(const T &lhs, const T &rhs) const { return lhs == rhs; } See also equal determines if two sets of elements are the same (function template) not_equal_to function object implementing x != y (class template) less function object implementing x < y (class template) ranges::equal_to function object implementing x == y (C++20) (class) http://cppreference.com 2022.07.31 std::equal_to(3)
NAME | Synopsis | Specializations | Member types | Member functions | Parameters | Return value | Exceptions | Possible implementation | See also
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