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## Class validation_error

boost::program_options::validation_error

## Synopsis

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

    class validation_error :
      public boost::program_options::error_with_option_name
    {
    public:

      enum kind_t { multiple_values_not_allowed = = 30,
                    at_least_one_value_required, invalid_bool_value,
                    invalid_option_value, invalid_option };
      // construct/copy/destruct
      validation_error(kind_t, const std::string & = "", const std::string & = "",
                       int = 0);
      ~validation_error();

      // protected member functions
      std::string get_template(kind_t);
    };

## Description

Class thrown when value of option is incorrect.

### `validation_error` public construct/copy/destruct

1.     validation_error(kind_t kind, const std::string & option_name = "",
                        const std::string & original_token = "",
                        int option_style = 0);

2.     ~validation_error();

### `validation_error` protected member functions

1.     std::string get_template(kind_t kind);

   Used to convert kind_t to a related error text