add 'err_invalid_value' helper

/**

 * This file is part of the "plotfx" project

 *   Copyright (c) 2016 Paul Asmuth, FnordCorp B.V.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 * 

 * * Redistributions of source code must retain the above copyright notice, this

 *   list of conditions and the following disclaimer.

 * 

 * * Redistributions in binary form must reproduce the above copyright notice,

 *   this list of conditions and the following disclaimer in the documentation

 *   and/or other materials provided with the distribution.

 * 

 * * Neither the name of the copyright holder nor the names of its

 *   contributors may be used to endorse or promote products derived from

 *   this software without specific prior written permission.

 * 

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "return_code.h"

namespace plotfx {

ReturnCode err_invalid_value(

    const std::string& value,

    std::vector<std::string> expected_values) {

  for (auto& v : expected_values) {

    v = "'" + v + "'";

  }

  return {

    ERROR,

    StringUtil::format(

        "invalid value: '$0'; expected one of: $1",

        value,

        StringUtil::join(expected_values, ", "))

  };

}

} // namespace plotfx

  return OK;

}

ReturnCode err_invalid_value(

    const std::string& value,

    std::vector<std::string> expected_values);

} // namespace plotfx