indexer/feature_impl.hpp


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#pragma once

#include "../base/macros.hpp"

#include "../std/string.hpp"


namespace feature
{
  static int const g_arrWorldScales[] = { 3, 5, 7, 9 };    // 9 = scales::GetUpperWorldScale()
  static int const g_arrCountryScales[] = { 10, 12, 14, 17 };  // 17 = scales::GetUpperScale()

  inline string GetTagForIndex(char const * prefix, int ind)
  {
    string str;
    str.reserve(strlen(prefix) + 1);
    str = prefix;

    static char const arrChar[] = { '0', '1', '2', '3' };
    STATIC_ASSERT ( ARRAY_SIZE(arrChar) >= ARRAY_SIZE(g_arrWorldScales) );
    STATIC_ASSERT ( ARRAY_SIZE(arrChar) >= ARRAY_SIZE(g_arrCountryScales) );
    ASSERT ( ind >= 0 && ind < ARRAY_SIZE(arrChar), (ind) );

    str += arrChar[ind];
    return str;
  }
}