[mlpack-git] [mlpack/mlpack] fix default output problem and some styles (#680)

[Ryan Curtin]

>                const std::string& description,
>                const std::string& alias,
>                bool required)
>  {
> +  // Temporary outstream object for detecting duplicate identifiers
> +  util::PrefixedOutStream outstr(std::cerr,
> +        BASH_RED "[FATAL] " BASH_CLEAR, false, true /* fatal */);
> +
> +  // identifier and alias maps
> +  gmap_t& gmap = GetSingleton().globalValues;
> +  amap_t& amap = GetSingleton().aliasValues;
> +
> +  // if found in current map, print fatal error and terminat program.
> +  if (gmap.count(identifier))
> +    outstr << "Parameter --" << identifier << "(-" << alias << ") "
> +           << "is defined multiple times with same identifiers." << std::endl;
> +  if (amap.count(alias))
> +    outstr << "Parameter --" << identifier << "(-" << alias << ") "
> +           << "is defined multiple times with same alias." << std::endl;

This is a good way to solve the problem of duplicate options, I like it.

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