stats_visitor

#include <gempba/stats/stats_visitor.hpp>  // included automatically via gempba.hpp

Abstract interface for reading out metrics from a stats object. Decouples collection (what is measured) from presentation (how it is reported).

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Member functions

virtual void visit(const stats&) = 0;

Called by stats::visit(stats_visitor*). Map field names from the stats object to member variables or output targets of your choosing.

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Custom implementation

class MyStatsVisitor : public gempba::stats_visitor {
public:
    std::size_t task_count{};
    double      idle_ms{};

    void visit(const gempba::stats& s) override {
        s.visit([this](const std::string& key, std::any&& value) {
            if (key == "received_task_count")
                task_count = std::any_cast<std::size_t>(value);
            else if (key == "idle_time")
                idle_ms = std::any_cast<double>(value);
        });
    }
};

MyStatsVisitor v;
stats_ptr->visit(&v);

Available field names depend on the concrete stats implementation. For the built-in MPI stats, see default_mpi_stats_visitor.