Remove consecutive whitespace

When receiving input from users, it's common to end up with excessive consecutive whitespace characters in your strings. This recipe presents a function for removing consecutive spaces, even when it includes tabs or other whitespace characters.

How to do it…

This function leverages the std::unique() algorithm to remove consecutive whitespace characters from a string.

• In the bw namespace, we start with a function to detect whitespace:

  template<typename T>
  bool isws(const T& c) {
      constexpr const T whitespace[]{ " \t\r\n\v\f" };
      for(const T& wsc : whitespace) {
          if(c == wsc) return true;
      }    
      return false;
  }

This templated isws() function should work with any character type.

• The delws() function uses std::unique() to erase consecutive...