BufferedEventReader.hh

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#pragma once
 
#include <cstddef>
#include <memory>
#include <optional>
#include <stack>
#include <string>
#include <utility>
#include <vector>
 
#include "LHEF/LHEF.h"
 
#include "HEJ/EventReader.hh"
 
namespace HEJ {
 
 
  class BufferedEventReader: public EventReader {
  public:
    explicit BufferedEventReader(std::unique_ptr<EventReader> reader):
      reader_{std::move(reader)}
    {}
 
    bool read_event() override;
 
    std::string const & header() const override {
      return reader_->header();
    }
 
    LHEF::HEPRUP const & heprup() const override {
      return reader_->heprup();
    }
 
    LHEF::HEPEUP const & hepeup() const override {
      return cur_event_;
    }
 
    std::optional<std::size_t> number_events() const override {
      return reader_->number_events();
    }
 
    template< class... T>
    void emplace(T&&... args) {
      buffer_.emplace(std::forward<T>(args)...);
    }
 
    double scalefactor() const override {
      return reader_->scalefactor();
    }
 
  private:
    std::stack<LHEF::HEPEUP, std::vector<LHEF::HEPEUP>> buffer_;
    std::unique_ptr<EventReader> reader_;
    LHEF::HEPEUP cur_event_;
  };
} // namespace HEJ