operator! (pronounced 'logical not operator') is an operator to do a logical not on a boolean. In other words: !true is false, and !false is true.

The example code below asserts that a std::string is not empty, before returning the first character of it.


#include <cassert>

#include <string>



char GetFirstChar(const std::string& s)

{

  assert(!s.empty());

  return s[0];

}



int main()

{

  assert(GetFirstChar("Bilderbikkel")=='B');

}

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(C++) operator!