tkstate_time.h

#ifndef TKN_STATE_TIME_H
#define TKN_STATE_TIME_H
 
#include "tkmeasure.h"
#include <cmath>
#include <limits>
 
namespace tkn { namespace detail {
 
// The persisted "lifetime" measure is T1/2 (time) or Gamma (energy).
// Only scalar accessors are exposed here: a generic tkmeasure of mean lifetime
// would otherwise inherit the legacy T1/2 <-> Gamma conversion convention.
inline double state_time_value(const shared_ptr<tkmeasure> &measure, bool stable,
                               tkunit_manager::units_keys unit, bool width)
{
   const auto expected = width ? tkunit_manager::kEnergy : tkunit_manager::kTime;
   if (gunits->get_type(unit) != expected) return std::numeric_limits<double>::quiet_NaN();
   if (stable) return width ? 0. : std::numeric_limits<double>::infinity();
   if (!measure) return std::numeric_limits<double>::quiet_NaN();
   // Do not mutate the shared property or reinterpret its uncertainty.
   tkunit value(measure->get_value(), measure->get_unit_key());
   return value.set_unit(unit) ? value.get_value() : std::numeric_limits<double>::quiet_NaN();
}
 
} } // namespace tkn::detail
#endif