not operator

not operator

Logical negation operator

---

  unary-expr  := !  cast-expr  not  cast-expr  

The not operator converts its operand to type bool , inverts its value, and returns a bool result. The not keyword is interchangeable with the ! token.

Example

 template<typename C> typename C::value_type checked_first(const C& c) {   if (  not  c.empty(  ))     return c[0];   throw std::out_of_range("container is empty"); } 

See Also

and , bool , expression , or , Chapter 3, <ciso646>