ExceptionCollector.h

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#ifndef art_Framework_EventProcessor_detail_ExceptionCollector_h
#define art_Framework_EventProcessor_detail_ExceptionCollector_h

// ======================================================================
//
// ExceptionCollector - Utility used to collect exceptions thrown when
// invoking functions that were provided to ExceptionCollector::call.
// The semantics are different than cet::exception_collector in that
// the (compiled-generated) ExceptionCollector d'tor DOES NOT call
// rethrow.
//
// TODO: determine if this class should be removed in favor of the
// cet::exception_collector class.
//
// ======================================================================

#include <exception>
#include <string>
#include <vector>

namespace art::detail {
  class ExceptionCollector {
  public:
    bool
    empty() const noexcept
    {
      return exceptions_.empty();
    }
    [[noreturn]] void rethrow();

    template <typename F>
    void
    call(F f) try {
      f();
    }
    catch (...) {
      exceptions_.push_back(std::current_exception());
    }

  private:
    std::vector<std::exception_ptr> exceptions_{};
  };

  class collected_exception : public std::exception {
  public:
    explicit collected_exception(std::string msg) : msg_(move(msg)) {}
    char const*
    what() const noexcept override
    {
      return msg_.c_str();
    }

  private:
    std::string const msg_;
  };
}

#endif /* art_Framework_EventProcessor_detail_ExceptionCollector_h */

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