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#ifndef ServiceRegistry_Service_h
#define ServiceRegistry_Service_h
// -*- C++ -*-
//
// Package: ServiceRegistry
// Class : Service
//
/**\class Service Service.h FWCore/ServiceRegistry/interface/Service.h
Description: Smart pointer used to give easy access to Service's
Usage:
*/
//
// Original Author: Chris Jones
// Created: Wed Sep 7 15:17:17 EDT 2005
//
// system include files
#include <optional>
// user include files
#include "FWCore/ServiceRegistry/interface/ServiceRegistry.h"
// forward declarations
namespace edm {
template <typename T>
class Service {
public:
Service() {}
//virtual ~Service();
// ---------- const member functions ---------------------
T* operator->() const { return &(ServiceRegistry::instance().template get<T>()); }
T& operator*() const { return ServiceRegistry::instance().template get<T>(); }
bool isAvailable() const { return ServiceRegistry::instance().template isAvailable<T>(); }
operator bool() const { return isAvailable(); }
///iF should be a functor and will only be called if the Service is available
template <typename F>
requires(!requires(F&& iF, T* t) {
{ iF(*t) } -> std::same_as<void>;
})
auto and_then(F&& iF, T* t) -> std::optional<decltype(iF(*t))> const {
if (isAvailable()) {
return iF(*(operator->()));
}
return std::nullopt;
}
template <typename F>
requires(requires(F&& iF, T* t) {
{ iF(*t) } -> std::same_as<void>;
})
void and_then(F&& iF) const {
if (isAvailable()) {
iF(*(operator->()));
}
}
// ---------- static member functions --------------------
// ---------- member functions ---------------------------
private:
};
} // namespace edm
#endif
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