52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
/* @file dimension.hpp */
|
|
|
|
#pragma once
|
|
|
|
#include <cstdint>
|
|
|
|
namespace xo {
|
|
namespace qty {
|
|
enum class dimension {
|
|
invalid = -1,
|
|
|
|
/** weight. native unit = 1 gram **/
|
|
mass,
|
|
/** distance. native unit = 1 meter **/
|
|
distance,
|
|
/** time. native unit = 1 second **/
|
|
time,
|
|
/** a currency amount. native unit depends on actual currency.
|
|
* For USD: one US dollar.
|
|
*
|
|
* NOTE: unit system isn't suitable for multicurrency work:
|
|
* (1usd + 1eur) is well-defined, but (1sec + 1m) is not.
|
|
**/
|
|
currency,
|
|
/** a screen price **/
|
|
price,
|
|
|
|
/** comes last, counts entries **/
|
|
n_dim
|
|
};
|
|
|
|
using dim = dimension;
|
|
|
|
inline const char *
|
|
dim2str(dimension x)
|
|
{
|
|
switch(x) {
|
|
case dimension::mass: return "mass";
|
|
case dimension::distance: return "distance";
|
|
case dimension::time: return "time";
|
|
case dimension::currency: return "currency";
|
|
case dimension::price: return "price";
|
|
default: break;
|
|
}
|
|
return "?dim";
|
|
}
|
|
|
|
static constexpr std::size_t n_dim = static_cast<std::size_t>(dimension::n_dim);
|
|
} /*namespace qty*/
|
|
} /*namespace xo*/
|
|
|
|
/* end dimension.hpp */
|