LazyConstructed< WrappedClass, Args > Class Template Reference

#include "CommonTools/Utils/interface/LazyConstructed.h"

Public Member Functions
	LazyConstructed (Args const &... args)
WrappedClass &	value ()

Private Member Functions
void	evaluate ()
template<std::size_t... ArgIndices>
void	evaluateImpl (std::index_sequence< ArgIndices... >)

Private Attributes
std::tuple< Args const &... >	args_
std::optional< WrappedClass >	object_ = std::nullopt

Detailed Description

template<class WrappedClass, class... Args>
class LazyConstructed< WrappedClass, Args >

Description: Wrapper around a class for lazy construction.

Usage: example: lazy SoA table auto object = makeLazy<edm::soa::EtaPhiTable>(trackCollection);

Notes: See similar class CommonTools/Utils/interface/LazyResult.h for implementation details.

Definition at line 28 of file LazyConstructed.h.

Constructor & Destructor Documentation

LazyConstructed()

template<class WrappedClass , class... Args>

LazyConstructed< WrappedClass, Args >::LazyConstructed ( Args const &...  args )

inline

Definition at line 30 of file LazyConstructed.h.

: args_(args...) {}

Member Function Documentation

evaluate()

template<class WrappedClass , class... Args>

void LazyConstructed< WrappedClass, Args >::evaluate ( )

inlineprivate

Definition at line 40 of file LazyConstructed.h.

{ evaluateImpl(std::make_index_sequence<sizeof...(Args)>{}); }

References LazyConstructed< WrappedClass, Args >::evaluateImpl().

Referenced by LazyConstructed< WrappedClass, Args >::value().

evaluateImpl()

template<class WrappedClass , class... Args>

template<std::size_t... ArgIndices>

void LazyConstructed< WrappedClass, Args >::evaluateImpl ( std::index_sequence< ArgIndices... >  )

inlineprivate

Definition at line 43 of file LazyConstructed.h.

                                                      {
    object_ = WrappedClass(std::get<ArgIndices>(args_)...);
  }

References LazyConstructed< WrappedClass, Args >::args_, and LazyConstructed< WrappedClass, Args >::object_.

Referenced by LazyConstructed< WrappedClass, Args >::evaluate().

value()

template<class WrappedClass , class... Args>

WrappedClass& LazyConstructed< WrappedClass, Args >::value ( )

inline

Definition at line 32 of file LazyConstructed.h.

                        {
    if (!object_) {
      evaluate();
    }
    return object_.value();
  }

References LazyConstructed< WrappedClass, Args >::evaluate(), and LazyConstructed< WrappedClass, Args >::object_.

Referenced by Types.int32::__nonzero__(), Types.uint32::__nonzero__(), Types.int64::__nonzero__(), Types.uint64::__nonzero__(), Types.double::__nonzero__(), Types.bool::__nonzero__(), Types.string::__nonzero__(), average.Average::average(), Types.string::configValue(), Types.FileInPath::configValue(), Mixins.UsingBlock::dumpPython(), Mixins.UsingBlock::insertInto(), Types.int32::insertInto(), Types.uint32::insertInto(), Types.int64::insertInto(), Types.uint64::insertInto(), Types.double::insertInto(), Types.bool::insertInto(), Types.string::insertInto(), Types.FileInPath::insertInto(), Types.vint32::insertInto(), Types.vuint32::insertInto(), Types.vint64::insertInto(), Types.vuint64::insertInto(), Types.vdouble::insertInto(), Types.vbool::insertInto(), and Types.vstring::insertInto().

Member Data Documentation

args_

template<class WrappedClass , class... Args>

std::tuple<Args const&...> LazyConstructed< WrappedClass, Args >::args_

private

Definition at line 48 of file LazyConstructed.h.

Referenced by LazyConstructed< WrappedClass, Args >::evaluateImpl(), valtools.webpage::parseArgs(), and batchmanager.BatchManager::ParseOptions().

object_

template<class WrappedClass , class... Args>

std::optional<WrappedClass> LazyConstructed< WrappedClass, Args >::object_ = std::nullopt

private

Definition at line 47 of file LazyConstructed.h.

Referenced by LazyConstructed< WrappedClass, Args >::evaluateImpl(), and LazyConstructed< WrappedClass, Args >::value().