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## Class invalid_syntax

boost::program_options::invalid_syntax

## Synopsis

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

    class invalid_syntax : public boost::program_options::error {
    public:

      enum kind_t { long_not_allowed =  30, long_adjacent_not_allowed,
                    short_adjacent_not_allowed, empty_adjacent_parameter,
                    missing_parameter, extra_parameter, unrecognized_line };
      // construct/copy/destruct
      invalid_syntax(const std::string &, kind_t);
      ~invalid_syntax();

      // public member functions
      kind_t kind() const;
      const std::string & tokens() const;

      // protected static functions
      static std::string error_message(kind_t) ;
    };

## Description

### `invalid_syntax` public construct/copy/destruct

1.     invalid_syntax(const std::string & tokens, kind_t kind);

2.     ~invalid_syntax();

### `invalid_syntax` public member functions

1.     kind_t kind() const;

2.     const std::string & tokens() const;

### `invalid_syntax` protected static functions

1.     static std::string error_message(kind_t kind) ;

   Used to convert kind_t to a related error text