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std::logical_not(3) C++ Standard Libary std::logical_not(3) NAME std::logical_not - std::logical_not Synopsis Defined in header <functional> template< class T > (until C++14) struct logical_not; template< class T = void > (since C++14) struct logical_not; Function object for performing logical NOT (logical negation). Ef- fectively calls operator! for type T. Specializations The standard library provides a specialization of std::logical_not when T is not specified, which leaves the parameter types and return type to be deduced. (since C++14) logical_not<void> function object implementing !x deducing argument (C++14) and return types (class template specialization) Member types Type Definition result_type (deprecated in C++17)(removed in C++20) bool argument_type (deprecated in C++17)(removed in C++20) T These member types are obtained via publicly inheriting (until C++11) std::unary_function<T, bool>. Member functions operator() returns the logical NOT of the argument (public member function) std::logical_not::operator() bool operator()( const T& arg ) const; (until C++14) constexpr bool operator()( const T& arg ) const; (since C++14) Returns the logical NOT of arg. Parameters arg - value to compute logical NOT of Return value The result of !arg. Exceptions May throw implementation-defined exceptions. Possible implementation constexpr // since C++14 bool operator()(const T &arg) const { return !arg; } http://cppreference.com 2022.07.31 std::logical_not(3)
NAME | Synopsis | Specializations | Member types | Member functions | Parameters | Return value | Exceptions | Possible implementation
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