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diff --git a/o3tl/inc/o3tl/lazy_update.hxx b/o3tl/inc/o3tl/lazy_update.hxx
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-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
-/*************************************************************************
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * Copyright 2000, 2010 Oracle and/or its affiliates.
- *
- * OpenOffice.org - a multi-platform office productivity suite
- *
- * This file is part of OpenOffice.org.
- *
- * OpenOffice.org is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 3
- * only, as published by the Free Software Foundation.
- *
- * OpenOffice.org is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License version 3 for more details
- * (a copy is included in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU Lesser General Public License
- * version 3 along with OpenOffice.org. If not, see
- * <http://www.openoffice.org/license.html>
- * for a copy of the LGPLv3 License.
- *
- ************************************************************************/
-
-#ifndef INCLUDED_O3TL_LAZY_UPDATE_HXX
-#define INCLUDED_O3TL_LAZY_UPDATE_HXX
-
-#include <sal/types.h>
-#include <boost/function.hpp>
-
-namespace o3tl
-{
- /** Update output object lazily
-
- This template collects data in input type, and updates the
- output type with the given update functor, but only if the
- output is requested. Usefúl if updating is expensive, or input
- changes frequently, but output is only comparatively seldom
- used.
-
- @example
- <pre>
-LazyUpdate<InType,OutType,LAZYUPDATE_DIRECT_TAG> myValue;
-*myValue = newInput;
-myValue->updateInput( this, that, those );
-
-output( *myValue );
- </pre>
- or
- <pre>
-output( myValue.getOutValue() );
- </pre>
- if the compiler does not recognize the const context.
- */
- template< typename InputType, typename OutputType, typename Tag > class LazyUpdate;
-
- /// LazyUpdate specialization takes boost::function argument
- struct LAZYUPDATE_FUNCTOR_TAG {};
- /// LazyUpdate specialization takes OutputType (*FunctionType)( InputType const& ) argument
- struct LAZYUPDATE_FUNCTION_TAG {};
- /// LazyUpdate specialization can directly convert, OutputType ctor must take InputType argument
- struct LAZYUPDATE_DIRECT_TAG {};
-
- // -----------------------------------------------------------------------------------------------------
-
- namespace detail
- {
- /// @internal
- template< typename InputType, typename OutputType, typename Functor > class LazyUpdateImpl : private Functor
- {
- public:
- typedef OutputType output_type;
- typedef InputType input_type;
-
- LazyUpdateImpl() :
- m_aInput()
- {}
-
- template< typename ParamType > explicit LazyUpdateImpl( ParamType const& rParm ) :
- Functor(rParm),
- m_aInput()
- {}
-
- enum UnaryConstructorTag{ UNARY_CONSTRUCTOR_TAG };
- LazyUpdateImpl( const input_type& rInput, UnaryConstructorTag ) :
- m_aInput(rInput)
- {}
-
- template< typename ParamType > LazyUpdateImpl( ParamType const& rParm,
- const input_type& rInput ) :
- Functor(rParm),
- m_aInput(rInput)
- {}
-
- // default copy ctor/assignment operator are ok
- // LazyUpdate( const LazyUpdate& );
- // LazyUpdate& operator=( const LazyUpdate& );
-
- void setInValue( input_type const& rIn ) { Functor::m_bCacheDirty = true; m_aInput = rIn; }
- input_type const& getInValue() const { return m_aInput; }
- output_type const& getOutValue() const { return implUpdateValue(m_aInput); }
-
- input_type& operator*() { Functor::m_bCacheDirty = true; return m_aInput; }
- input_type* operator->() { Functor::m_bCacheDirty = true; return &m_aInput; }
-
- output_type const& operator*() const { return implUpdateValue(m_aInput); }
- output_type const* operator->() const { return &implUpdateValue(m_aInput); }
-
- private:
- input_type m_aInput;
- };
-
- template< typename InputType, typename OutputType > struct DefaultFunctor
- {
- protected:
- typedef OutputType output_type;
- typedef InputType input_type;
-
- DefaultFunctor() :
- m_aOutput(),
- m_bCacheDirty(true)
- {}
-
- OutputType const& implUpdateValue( input_type const& rIn ) const
- {
- if( m_bCacheDirty )
- {
- m_aOutput = output_type( rIn );
- m_bCacheDirty = false;
- }
-
- return m_aOutput;
- }
-
- mutable output_type m_aOutput;
- mutable bool m_bCacheDirty; // when true, m_aOutput needs update
- };
-
- template< typename InputType, typename OutputType, typename FunctionType > struct FunctionPointer
- {
- protected:
- typedef OutputType output_type;
- typedef InputType input_type;
- typedef FunctionType function_type;
-
- FunctionPointer() :
- m_pFunc(),
- m_aOutput(),
- m_bCacheDirty(true)
-
- {}
-
- explicit FunctionPointer( function_type const& pFunc ) :
- m_pFunc(pFunc),
- m_aOutput(),
- m_bCacheDirty(true)
-
- {}
-
- output_type const& implUpdateValue( input_type const& rIn ) const
- {
- if( m_bCacheDirty )
- {
- m_aOutput = m_pFunc( rIn );
- m_bCacheDirty = false;
- }
-
- return m_aOutput;
- }
-
- function_type m_pFunc;
- mutable output_type m_aOutput;
- mutable bool m_bCacheDirty; // when true, m_aOutput needs update
- };
- }
-
- // -----------------------------------------------------------------------------------------------------
-
- // partial specializations for the three LAZYUPDATE_* tags
-
- template< typename InputType, typename OutputType > class LazyUpdate<InputType,
- OutputType,
- LAZYUPDATE_DIRECT_TAG> :
- public detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::DefaultFunctor<InputType, OutputType> >
- {
- public:
- LazyUpdate() {}
- explicit LazyUpdate( InputType const& rIn ) :
- detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::DefaultFunctor<InputType, OutputType> >(
- rIn,
- detail::LazyUpdateImpl<
- InputType,
- OutputType,
- detail::DefaultFunctor<InputType, OutputType> >::UNARY_CONSTRUCTOR_TAG )
- {}
- };
-
- // -----------------------------------------------------------------------------------------------------
-
- template< typename InputType, typename OutputType > class LazyUpdate<InputType,
- OutputType,
- LAZYUPDATE_FUNCTION_TAG> :
- public detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::FunctionPointer<
- InputType,
- OutputType,
- OutputType (*)( InputType const& ) > >
- {
- public:
- explicit LazyUpdate( OutputType (*pFunc)( InputType const& ) ) :
- detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::FunctionPointer<
- InputType,
- OutputType,
- OutputType (*)( InputType const& )> >(pFunc)
- {}
- LazyUpdate( OutputType (*pFunc)( InputType const& ),
- InputType const& rIn ) :
- detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::FunctionPointer<
- InputType,
- OutputType,
- OutputType (*)( InputType const& )> >(pFunc,rIn)
- {}
- };
-
- // -----------------------------------------------------------------------------------------------------
-
- template< typename InputType, typename OutputType > class LazyUpdate<InputType,
- OutputType,
- LAZYUPDATE_FUNCTOR_TAG> :
- public detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::FunctionPointer<
- InputType,
- OutputType,
- boost::function1<OutputType,InputType> > >
- {
- public:
- explicit LazyUpdate( boost::function1<OutputType,InputType> const& rFunc ) :
- detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::FunctionPointer<
- InputType,
- OutputType,
- boost::function1<OutputType,InputType> > >(rFunc)
- {}
- LazyUpdate( boost::function1<OutputType,InputType> const& rFunc,
- InputType const& rIn ) :
- detail::LazyUpdateImpl<InputType,
- OutputType,
- detail::FunctionPointer<
- InputType,
- OutputType,
- boost::function1<OutputType,InputType> > >(rFunc,rIn)
- {}
- };
-
-}
-
-#endif /* INCLUDED_O3TL_LAZY_UPDATE_HXX */
-
-/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-26 17:44:31 +0000