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      std::logical_not<void>

      From cppreference.com
      <cpp‎ |utility‎ |functional
       
       
      Utilities library
       
      Function objects
      Function invocation
      (C++17)(C++23)
      Identity function object
      (C++20)
      Transparent operator wrappers
      (C++14)
      (C++14)
      (C++14)
      (C++14)  
      (C++14)
      (C++14)
      (C++14)
      (C++14)
      (C++14)
      (C++14)
      (C++14)
      (C++14)
      (C++14)
      logical_not<>
      (C++14)

      Old binders and adaptors
      (until C++17*)
      (until C++17*)
      (until C++17*)
      (until C++17*)  
      (until C++17*)
      (until C++17*)(until C++17*)(until C++17*)(until C++17*)
      (until C++20*)
      (until C++20*)
      (until C++17*)(until C++17*)
      (until C++17*)(until C++17*)

      (until C++17*)
      (until C++17*)(until C++17*)(until C++17*)(until C++17*)
      (until C++20*)
      (until C++20*)
       
      Defined in header<functional>
      template<>
      class logical_not<void>;
      		(since C++14)

      std::logical_not<void> is a specialization ofstd::logical_not with parameter and return type deduced.

      Contents

      [edit]Nested types

      Nested type Definition
      is_transparentunspecified

      [edit]Member functions

      operator()
      		 appliesoperator! to its argument
      (public member function)

      std::logical_not<void>::operator()

      template<class T>

      constexprauto operator()( T&& arg)const

         -> decltype(!std::forward<T>(arg));

      Returns the result of!std::forward<T>(arg).

      Parameters

      arg - value to apply logical NOT to

      Return value

      !std::forward<T>(arg).

      [edit]Example

      This section is incomplete
      Reason: no example
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