6120e13d29
- makes it easier to use for local or alternative storage.
Eg,
```
tmp<volScalarField> tfld;
tfld.cref(obj.cfindObject<volScalarField>("name"));
if (!tfld)
{
tfld = volScalarField::New("name", ...);
}
```
304 lines
9.5 KiB
C++
304 lines
9.5 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | www.openfoam.com
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2011-2016 OpenFOAM Foundation
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Copyright (C) 2018-2021 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::tmp
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Description
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A class for managing temporary objects.
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This is a combination of std::shared_ptr (with intrusive ref-counting)
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and a shared_ptr without ref-counting and null deleter.
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This allows the tmp to double as a pointer management and an indirect
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pointer to externally allocated objects.
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SourceFiles
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tmpI.H
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See also
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Foam::autoPtr
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Foam::refPtr
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Foam::refCount
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\*---------------------------------------------------------------------------*/
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#ifndef tmp_H
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#define tmp_H
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#include "refCount.H"
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#include "word.H"
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#include "stdFoam.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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/*---------------------------------------------------------------------------*\
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Class tmp Declaration
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\*---------------------------------------------------------------------------*/
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template<class T>
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class tmp
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{
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// Private Data
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//- Object types
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enum refType
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{
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PTR, //!< Managing a pointer (ref-counted)
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CREF, //!< Using (const) reference to an object
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REF //!< Using (non-const) reference to an object
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};
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//- The managed pointer or address of the object (reference)
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mutable T* ptr_;
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//- The type (managed pointer | object reference)
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mutable refType type_;
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// Private Member Operators
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//- Increment the ref-count for a managed pointer
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//- and check that it is not oversubscribed
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inline void incrCount();
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public:
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// STL type definitions
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//- Type of object being managed or referenced
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typedef T element_type;
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//- Pointer to type of object being managed or referenced
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typedef T* pointer;
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//- Reference counter class
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typedef Foam::refCount refCount;
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// Factory Methods
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//- Construct tmp of T with forwarding arguments
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// \param args list of arguments with which an instance of T
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// will be constructed.
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//
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// \note Similar to std::make_shared, but the overload for
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// array types is not disabled.
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template<class... Args>
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inline static tmp<T> New(Args&&... args);
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//- Construct tmp from derived type with forwarding arguments
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// \param args list of arguments with which an instance of U
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// will be constructed.
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//
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// \note Similar to New but for derived types
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template<class U, class... Args>
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inline static tmp<T> NewFrom(Args&&... args);
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// Constructors
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//- Default construct, no managed pointer.
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inline constexpr tmp() noexcept;
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//- Construct with no managed pointer.
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inline constexpr tmp(std::nullptr_t) noexcept;
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//- Construct, taking ownership of the pointer.
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inline explicit tmp(T* p);
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//- Construct for a const reference to an object.
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inline constexpr tmp(const T& obj) noexcept;
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//- Move construct, transferring ownership.
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// Does not affect ref-count
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inline tmp(tmp<T>&& rhs) noexcept;
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//- Move construct, transferring ownership.
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// Does not affect ref-count
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// \note Non-standard definition - should be non-const
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inline tmp(const tmp<T>&& rhs) noexcept;
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//- Copy construct, incrementing ref-count of managed pointer.
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// \note Non-standard definition - should be non-const
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inline tmp(const tmp<T>& rhs);
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//- Copy/move construct. Optionally reusing ref-counted pointer.
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inline tmp(const tmp<T>& rhs, bool reuse);
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//- Destructor: deletes managed pointer when the ref-count is 0
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inline ~tmp();
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// Member Functions
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//- The type-name, constructed from type-name of T
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inline static word typeName();
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// Query
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//- Deprecated(2020-07) True if a null managed pointer
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//
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// \deprecated(2020-07) - use bool operator
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FOAM_DEPRECATED_FOR(2020-07, "bool operator")
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bool empty() const noexcept { return !ptr_; }
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//- True for non-null pointer/reference
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bool valid() const noexcept { return ptr_; }
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//- True if this is a managed pointer (not a reference)
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bool is_pointer() const noexcept { return type_ == PTR; }
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//- Identical to is_pointer()
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bool isTmp() const noexcept { return type_ == PTR; }
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//- True if this is a non-null managed pointer with a unique ref-count
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inline bool movable() const noexcept;
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// Access
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//- Return pointer without nullptr checking.
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T* get() noexcept { return ptr_; }
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//- Return const pointer without nullptr checking.
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const T* get() const noexcept { return ptr_; }
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//- Return const reference to the object or to the contents
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//- of a (non-null) managed pointer.
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// Fatal for a null managed pointer
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inline const T& cref() const;
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//- Return non-const reference to the contents of a non-null
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//- managed pointer.
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// Fatal for a null managed pointer or if the object is const.
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inline T& ref() const;
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//- Return non-const reference to the object or to the contents
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//- of a (non-null) managed pointer, with an additional const_cast.
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// Fatal for a null pointer.
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inline T& constCast() const;
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// Edit
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//- Return managed pointer for reuse, or clone() the object reference.
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inline T* ptr() const;
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//- If object pointer points to valid object:
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//- delete object and set pointer to nullptr
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inline void clear() const noexcept;
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//- Delete managed temporary object and set to new given pointer
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inline void reset(T* p = nullptr) noexcept;
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//- Clear existing and transfer ownership.
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inline void reset(tmp<T>&& other) noexcept;
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//- Clear existing and set (const) reference
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inline void cref(const T& obj) noexcept;
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//- Clear existing and set (const) reference to pointer content.
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// A null pointer is permitted (treated as a managed pointer).
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inline void cref(const T* p) noexcept;
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//- Clear existing and set to (non-const) reference
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inline void ref(T& obj) noexcept;
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//- Clear existing and set (non-const) reference to pointer content.
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// A null pointer is permitted (treated as a managed pointer).
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inline void ref(T* p) noexcept;
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//- Swaps the managed object with other.
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inline void swap(tmp<T>& other) noexcept;
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// Member Operators
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//- Dereferences (const) pointer to the managed object.
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// Fatal for a null managed pointer.
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inline const T* operator->() const;
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//- Dereferences (non-const) pointer to the managed object.
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// Fatal for a null managed pointer or if the object is const.
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inline T* operator->();
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//- Return const reference to the object - same as cref() method.
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const T& operator()() const { return cref(); }
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//- Cast to underlying data type, using the cref() method.
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operator const T&() const { return cref(); }
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//- Non-null pointer/reference : valid()
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explicit operator bool() const noexcept { return ptr_; }
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//- Transfer ownership of the managed pointer.
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// Fatal for a null managed pointer or if the object is const.
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inline void operator=(const tmp<T>& other);
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//- Clear existing and transfer ownership.
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inline void operator=(tmp<T>&& other) noexcept;
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//- Take ownership of the pointer.
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// Fatal for a null pointer, or when the pointer is non-unique.
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inline void operator=(T* p);
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//- Reset via assignment from literal nullptr
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inline void operator=(std::nullptr_t) noexcept;
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};
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// Global Functions
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//- Specialized Swap algorithm for tmp.
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// Swaps the pointers and types of lhs and rhs. Calls \c lhs.swap(rhs)
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template<class T>
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void Swap(tmp<T>& lhs, tmp<T>& rhs)
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{
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lhs.swap(rhs);
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#include "tmpI.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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