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chronon::observe::DerivedCounter

Computed counter declared as a unit member alongside raw Counters. More...

#include <DerivedCounter.hpp>

Public Functions​

Name
DerivedCounter &operator=(const DerivedCounter & ) =delete
const std::string &name() const
const std::string &description() const
DerivedCounter(ObservableUnit * owner, std::string_view name, std::string_view description, std::initializer_list< std::reference_wrapper< const Counter > > sources, ComputeFn compute)
DerivedCounter(const DerivedCounter & ) =delete

Friends​

Name
classObservableUnit

Detailed Description​

class chronon::observe::DerivedCounter;

Computed counter declared as a unit member alongside raw Counters.

Computation runs on the backend thread at CSV dump time, so there is no simulation hot-path overhead.

class Fetch : public TickableUnit, public ObservableUnit {
    Counter hits_{this, "hits", "Cache hits"};
    Counter misses_{this, "misses", "Cache misses"};
    DerivedCounter hit_rate_{this, "hit_rate", "Cache hit rate",
        {hits_, misses_}, DerivedFormula::Ratio};
};

Public Functions Documentation​

function operator=​

DerivedCounter & operator=(
    const DerivedCounter & 
) =delete

function name​

inline const std::string & name() const

function description​

inline const std::string & description() const

function DerivedCounter​

DerivedCounter(
    ObservableUnit * owner,
    std::string_view name,
    std::string_view description,
    std::initializer_list< std::reference_wrapper< const Counter > > sources,
    ComputeFn compute
)

Parameters:

  • owner Owning ObservableUnit.
  • name Derived counter name (appears as unit.name in CSV).
  • description Human-readable description.
  • sources Source counters whose delta values are passed to compute.
  • compute Function computing the derived value from source deltas.

function DerivedCounter​

DerivedCounter(
    const DerivedCounter & 
) =delete

Friends​

friend ObservableUnit​

friend class ObservableUnit(
    ObservableUnit 
);

Updated on 2026-05-26 at 05:42:33 +0000