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File: [OMI] / omi / micxx / instance.h
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Revision: 1.1.1.1 (vendor branch), Wed May 30 21:47:49 2012 UTC (12 years, 1 month ago) by mike Branch: TOG CVS Tags: OMI_1_0_2_Branch, OMI_1_0_2, OMI_1_0_1_PRE, OMI_1_0_1, OMI_1_0_0 Changes since 1.1: +0 -0 lines Initial Import |
/* **============================================================================== ** ** Open Management Infrastructure (OMI) ** ** Copyright (c) Microsoft Corporation ** ** Licensed under the Apache License, Version 2.0 (the "License"); you may not ** use this file except in compliance with the License. You may obtain a copy ** of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY ** KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED ** WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, ** MERCHANTABLITY OR NON-INFRINGEMENT. ** ** See the Apache 2 License for the specific language governing permissions ** and limitations under the License. ** **============================================================================== */ #ifndef _micxx_instance_h #define _micxx_instance_h #include <MI.h> #include "linkage.h" #include "atomic.h" #include "memory.h" #include "string.h" #include "field.h" #include "array.h" #include "types.h" MI_BEGIN_NAMESPACE ////////////////////////// // Base class for C++ MI_Instance representation class MICXX_LINKAGE Instance { public: Instance(); Instance(const Instance& x); ~Instance(); Instance& operator=(const Instance& x); String GetNamespace() const; void SetNamespace(const String& nameSpace); void Print(FILE* os = stdout, MI_Uint32 level = 0) const; static const MI_ClassDecl* GetClassDecl(); protected: Instance( const MI_ClassDecl* clDecl, const MI_Instance* instance, bool keysOnly); Instance( const MI_ClassDecl* clDecl); Instance( const MI_MethodDecl* methodDecl); Instance( const MI_MethodDecl* methodDecl, const MI_Instance* instance, bool keysOnly); void CopyRef( const Instance& x); void COW() { if (AtomicGet(GetHeader(m_instance)->u.s.m_refCounter) != 1) { MI_Instance* current = m_instance; m_instance = Clone(); AddRef(m_instance); Release(current); } } template<typename T> Field<T>& GetField(size_t offset) { COW(); void* ptr = reinterpret_cast<char*>(m_instance) + offset; return *(reinterpret_cast<Field<T>*>(ptr)); } template<typename T> const Field<T>& GetField(size_t offset) const { const void* ptr = reinterpret_cast<const char*>(m_instance) + offset; return *(reinterpret_cast<const Field<T>*>(ptr)); } private: // helper data - placed before MI_Instance strucutre struct Header { union { struct _HeaderData { AtomicType m_refCounter; } s; char alignment[(sizeof(struct _HeaderData) + 7) & ~7]; } u; }; void Initialize( const MI_ClassDecl* clDecl, const MI_Instance* instance, bool keysOnly); static Header* GetHeader(MI_Instance* instance) { return reinterpret_cast<Header*>( reinterpret_cast<char*>(instance) - sizeof(Header)); } static void AddRef(MI_Instance* instance) { AtomicInc(GetHeader(instance)->u.s.m_refCounter); } static void Release(MI_Instance* instance); static MI_Instance* Create(const MI_ClassDecl* clDecl); MI_Instance* Clone() const; MI_Instance* m_instance; friend class Context; friend class DInstance; MICXX_LINKAGE friend bool __IsA(const MI_ClassDecl*, const Instance*); }; inline Instance::Instance() : m_instance(0) { } inline Instance::Instance(const Instance& x) : m_instance(0) { CopyRef(x); } inline Instance::~Instance() { Release(m_instance); } inline Instance& Instance::operator=(const Instance& x) { CopyRef(x); return *this; } template<> inline const ArrayTraits* GetArrayTraits<Instance>() { return __traits[MI_INSTANCE]; }; typedef Array<Instance> InstanceA; MICXX_LINKAGE bool __IsA(const MI_ClassDecl* classDecl, const Instance* instance); template<class CLASS> bool IsA(const Instance& instance) { return __IsA(((CLASS*)0)->GetClassDecl(), &instance); } MI_END_NAMESPACE #endif /* _micxx_instance_h */
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