Line data    Source code

       1             : /* @file dimension.hpp */
       2             : 
       3             : #pragma once
       4             : 
       5             : #include <cstdint>
       6             : 
       7             : namespace xo {
       8             :     namespace qty {
       9             :         enum class dim {
      10             :             invalid = -1,
      11             : 
      12             :             /** weight.  native unit = 1 gram **/
      13             :             mass,
      14             :             /** distance.  native unit = 1 meter **/
      15             :             distance,
      16             :             /** time. native unit = 1 second **/
      17             :             time,
      18             :             /** a currency amount. native unit depends on actual currency.
      19             :              *  For USD: one US dollar.
      20             :              *
      21             :              *  NOTE: unit system isn't suitable for multicurrency work:
      22             :              *        (1usd + 1eur) is well-defined,  but (1sec + 1m) is not.
      23             :              **/
      24             :             currency,
      25             :             /** a screen price **/
      26             :             price,
      27             : 
      28             :             /** comes last, counts entries **/
      29             :             n_dim
      30             :         };
      31             : 
      32             :         inline const char *
      33          27 :         dim2str(dim x)
      34             :         {
      35          27 :             switch(x) {
      36             :             case dim::mass:     return "mass";
      37           6 :             case dim::distance: return "distance";
      38           6 :             case dim::time:     return "time";
      39           0 :             case dim::currency: return "currency";
      40           0 :             case dim::price:    return "price";
      41           0 :             default: break;
      42             :             }
      43           0 :             return "?dim";
      44             :         }
      45             : 
      46             :         static constexpr std::size_t n_dim = static_cast<std::size_t>(dim::n_dim);
      47             :     } /*namespace qty*/
      48             : } /*namespace xo*/
      49             : 
      50             : /* end dimension.hpp */