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## Class error_with_no_option_name

boost::program_options::error_with_no_option_name

## Synopsis

    // In header: <boost/program_options/errors.hpp>

    class error_with_no_option_name :
      public boost::program_options::error_with_option_name
    {
    public:
      // construct/copy/destruct
      error_with_no_option_name(const std::string &, const std::string & = "");
      ~error_with_no_option_name();

      // public member functions
      virtual void set_option_name(const std::string &);
    };

## Description

Base class of unparsable options, when the desired option cannot be identified.

It makes no sense to have an option name, when we can't match an option to the parameter

Having this a part of the error_with_option_name hierachy makes error handling a lot easier, even if the name indicates some sort of conceptual dissonance!

### `error_with_no_option_name` public construct/copy/destruct

1.     error_with_no_option_name(const std::string & template_,
                                 const std::string & original_token = "");

2.     ~error_with_no_option_name();

### `error_with_no_option_name` public member functions

1.     virtual void set_option_name(const std::string &);

   Does NOT set option name, because no option name makes sense