# OgreMemoryAllocatorConfig.h File Reference
Memory

This file configures Ogre's memory allocators. More...

`#include "OgreMemoryAllocatedObject.h"`
`#include "OgreMemorySTLAllocator.h"`
`#include "OgreMemoryNedPooling.h"`

Go to the source code of this file.

## Classes

class | Ogre::CategorisedAllocPolicy< Cat >
class | Ogre::CategorisedAlignAllocPolicy< Cat, align >

## Namespaces

namespace | Ogre

## Defines

#define | OGRE_MALLOC(bytes, category) ::Ogre::CategorisedAllocPolicy<category>::allocateBytes(bytes)
| Allocate a block of raw memory, and indicate the category of usage.
#define | OGRE_ALLOC_T(T, count, category) static_cast<T*>(::Ogre::CategorisedAllocPolicy<category>::allocateBytes(sizeof(T)*(count)))
| Allocate a block of memory for a primitive type, and indicate the category of usage.
#define | OGRE_FREE(ptr, category) ::Ogre::CategorisedAllocPolicy<category>::deallocateBytes((void*)ptr)
| Free the memory allocated with OGRE_MALLOC or OGRE_ALLOC_T. Category is required to be restated to ensure the matching policy is used.
#define | OGRE_NEW_T(T, category) new (::Ogre::CategorisedAllocPolicy<category>::allocateBytes(sizeof(T))) T
| Allocate space for one primitive type, external type or non-virtual type with constructor parameters.
#define | OGRE_NEW_ARRAY_T(T, count, category) ::Ogre::constructN(static_cast<T*>(::Ogre::CategorisedAllocPolicy<category>::allocateBytes(sizeof(T)*(count))), count)
| Allocate a block of memory for 'count' primitive types - do not use for classes that inherit from AllocatedObject.
#define | OGRE_DELETE_T(ptr, T, category) if(ptr){(ptr)->~T(); ::Ogre::CategorisedAllocPolicy<category>::deallocateBytes((void*)ptr);}
| Free the memory allocated with OGRE_NEW_T. Category is required to be restated to ensure the matching policy is used.
#define | OGRE_DELETE_ARRAY_T(ptr, T, count, category) if(ptr){for (size_t b = 0; b < count; ++b) { (ptr)[b].~T();} ::Ogre::CategorisedAllocPolicy<category>::deallocateBytes((void*)ptr);}
| Free the memory allocated with OGRE_NEW_ARRAY_T. Category is required to be restated to ensure the matching policy is used, count and type to call destructor.
#define | OGRE_MALLOC_SIMD(bytes, category) ::Ogre::CategorisedAlignAllocPolicy<category>::allocateBytes(bytes)
| Allocate a block of raw memory aligned to SIMD boundaries, and indicate the category of usage.
#define | OGRE_MALLOC_ALIGN(bytes, category, align) ::Ogre::CategorisedAlignAllocPolicy<category, align>::allocateBytes(bytes)
| Allocate a block of raw memory aligned to user defined boundaries, and indicate the category of usage.
#define | OGRE_ALLOC_T_SIMD(T, count, category) static_cast<T*>(::Ogre::CategorisedAlignAllocPolicy<category>::allocateBytes(sizeof(T)*(count)))
| Allocate a block of memory for a primitive type aligned to SIMD boundaries, and indicate the category of usage.
#define | OGRE_ALLOC_T_ALIGN(T, count, category, align) static_cast<T*>(::Ogre::CategorisedAlignAllocPolicy<category, align>::allocateBytes(sizeof(T)*(count)))
| Allocate a block of memory for a primitive type aligned to user defined boundaries, and indicate the category of usage.
#define | OGRE_FREE_SIMD(ptr, category) ::Ogre::CategorisedAlignAllocPolicy<category>::deallocateBytes((void*)ptr)
| Free the memory allocated with either OGRE_MALLOC_SIMD or OGRE_ALLOC_T_SIMD. Category is required to be restated to ensure the matching policy is used.
#define | OGRE_FREE_ALIGN(ptr, category, align) ::Ogre::CategorisedAlignAllocPolicy<category, align>::deallocateBytes((void*)ptr)
| Free the memory allocated with either OGRE_MALLOC_ALIGN or OGRE_ALLOC_T_ALIGN. Category is required to be restated to ensure the matching policy is used.
#define | OGRE_NEW_T_SIMD(T, category) new (::Ogre::CategorisedAlignAllocPolicy<category>::allocateBytes(sizeof(T))) T
| Allocate space for one primitive type, external type or non-virtual type aligned to SIMD boundaries.
#define | OGRE_NEW_ARRAY_T_SIMD(T, count, category) ::Ogre::constructN(static_cast<T*>(::Ogre::CategorisedAlignAllocPolicy<category>::allocateBytes(sizeof(T)*(count))), count)
| Allocate a block of memory for 'count' primitive types aligned to SIMD boundaries - do not use for classes that inherit from AllocatedObject.
#define | OGRE_DELETE_T_SIMD(ptr, T, category) if(ptr){(ptr)->~T(); ::Ogre::CategorisedAlignAllocPolicy<category>::deallocateBytes((void*)ptr);}
| Free the memory allocated with OGRE_NEW_T_SIMD. Category is required to be restated to ensure the matching policy is used.
#define | OGRE_DELETE_ARRAY_T_SIMD(ptr, T, count, category) if(ptr){for (size_t b = 0; b < count; ++b) { (ptr)[b].~T();} ::Ogre::CategorisedAlignAllocPolicy<category>::deallocateBytes((void*)ptr);}
| Free the memory allocated with OGRE_NEW_ARRAY_T_SIMD. Category is required to be restated to ensure the matching policy is used, count and type to call destructor.
#define | OGRE_NEW_T_ALIGN(T, category, align) new (::Ogre::CategorisedAlignAllocPolicy<category, align>::allocateBytes(sizeof(T))) T
| Allocate space for one primitive type, external type or non-virtual type aligned to user defined boundaries.
#define | OGRE_NEW_ARRAY_T_ALIGN(T, count, category, align) ::Ogre::constructN(static_cast<T*>(::Ogre::CategorisedAlignAllocPolicy<category, align>::allocateBytes(sizeof(T)*(count))), count)
| Allocate a block of memory for 'count' primitive types aligned to user defined boundaries - do not use for classes that inherit from AllocatedObject.
#define | OGRE_DELETE_T_ALIGN(ptr, T, category, align) if(ptr){(ptr)->~T(); ::Ogre::CategorisedAlignAllocPolicy<category, align>::deallocateBytes((void*)ptr);}
| Free the memory allocated with OGRE_NEW_T_ALIGN. Category is required to be restated to ensure the matching policy is used.
#define | OGRE_DELETE_ARRAY_T_ALIGN(ptr, T, count, category, align) if(ptr){for (size_t _b = 0; _b < count; ++_b) { (ptr)[_b].~T();} ::Ogre::CategorisedAlignAllocPolicy<category, align>::deallocateBytes((void*)ptr);}
| Free the memory allocated with OGRE_NEW_ARRAY_T_ALIGN. Category is required to be restated to ensure the matching policy is used, count and type to call destructor.
#define | OGRE_NEW new
#define | OGRE_DELETE delete

## Typedefs

typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_GENERAL > | Ogre::GeneralAllocPolicy
typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_GEOMETRY > | Ogre::GeometryAllocPolicy
typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_ANIMATION > | Ogre::AnimationAllocPolicy
typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_SCENE_CONTROL > | Ogre::SceneCtlAllocPolicy
typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_SCENE_OBJECTS > | Ogre::SceneObjAllocPolicy
typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_RESOURCE > | Ogre::ResourceAllocPolicy
typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_SCRIPTING > | Ogre::ScriptingAllocPolicy
typedef CategorisedAllocPolicy < Ogre::MEMCATEGORY_RENDERSYS > | Ogre::RenderSysAllocPolicy
typedef AllocatedObject < GeneralAllocPolicy > | Ogre::GeneralAllocatedObject
typedef AllocatedObject < GeometryAllocPolicy > | Ogre::GeometryAllocatedObject
typedef AllocatedObject < AnimationAllocPolicy > | Ogre::AnimationAllocatedObject
typedef AllocatedObject < SceneCtlAllocPolicy > | Ogre::SceneCtlAllocatedObject
typedef AllocatedObject < SceneObjAllocPolicy > | Ogre::SceneObjAllocatedObject
typedef AllocatedObject < ResourceAllocPolicy > | Ogre::ResourceAllocatedObject
typedef AllocatedObject < ScriptingAllocPolicy > | Ogre::ScriptingAllocatedObject
typedef AllocatedObject < RenderSysAllocPolicy > | Ogre::RenderSysAllocatedObject
typedef ScriptingAllocatedObject | Ogre::AbstractNodeAlloc
typedef AnimationAllocatedObject | Ogre::AnimableAlloc
typedef AnimationAllocatedObject | Ogre::AnimationAlloc
typedef GeneralAllocatedObject | Ogre::ArchiveAlloc
typedef GeometryAllocatedObject | Ogre::BatchedGeometryAlloc
typedef RenderSysAllocatedObject | Ogre::BufferAlloc
typedef GeneralAllocatedObject | Ogre::CodecAlloc
typedef ResourceAllocatedObject | Ogre::CompositorInstAlloc
typedef GeneralAllocatedObject | Ogre::ConfigAlloc
typedef GeneralAllocatedObject | Ogre::ControllerAlloc
typedef GeometryAllocatedObject | Ogre::DebugGeomAlloc
typedef GeneralAllocatedObject | Ogre::DynLibAlloc
typedef GeometryAllocatedObject | Ogre::EdgeDataAlloc
typedef GeneralAllocatedObject | Ogre::FactoryAlloc
typedef SceneObjAllocatedObject | Ogre::FXAlloc
typedef GeneralAllocatedObject | Ogre::ImageAlloc
typedef GeometryAllocatedObject | Ogre::IndexDataAlloc
typedef GeneralAllocatedObject | Ogre::LogAlloc
typedef SceneObjAllocatedObject | Ogre::MovableAlloc
typedef SceneCtlAllocatedObject | Ogre::NodeAlloc
typedef SceneObjAllocatedObject | Ogre::OverlayAlloc
typedef RenderSysAllocatedObject | Ogre::GpuParamsAlloc
typedef ResourceAllocatedObject | Ogre::PassAlloc
typedef GeometryAllocatedObject | Ogre::PatchAlloc
typedef GeneralAllocatedObject | Ogre::PluginAlloc
typedef GeneralAllocatedObject | Ogre::ProfilerAlloc
typedef GeometryAllocatedObject | Ogre::ProgMeshAlloc
typedef SceneCtlAllocatedObject | Ogre::RenderQueueAlloc
typedef RenderSysAllocatedObject | Ogre::RenderSysAlloc
typedef GeneralAllocatedObject | Ogre::RootAlloc
typedef ResourceAllocatedObject | Ogre::ResourceAlloc
typedef GeneralAllocatedObject | Ogre::SerializerAlloc
typedef SceneCtlAllocatedObject | Ogre::SceneMgtAlloc
typedef ScriptingAllocatedObject | Ogre::ScriptCompilerAlloc
typedef ScriptingAllocatedObject | Ogre::ScriptTranslatorAlloc
typedef SceneCtlAllocatedObject | Ogre::ShadowDataAlloc
typedef GeneralAllocatedObject | Ogre::StreamAlloc
typedef SceneObjAllocatedObject | Ogre::SubEntityAlloc
typedef ResourceAllocatedObject | Ogre::SubMeshAlloc
typedef ResourceAllocatedObject | Ogre::TechniqueAlloc
typedef GeneralAllocatedObject | Ogre::TimerAlloc
typedef ResourceAllocatedObject | Ogre::TextureUnitStateAlloc
typedef GeneralAllocatedObject | Ogre::UtilityAlloc
typedef GeometryAllocatedObject | Ogre::VertexDataAlloc
typedef RenderSysAllocatedObject | Ogre::ViewportAlloc
typedef SceneCtlAllocatedObject | Ogre::LodAlloc

## Enumerations

enum | Ogre::MemoryCategory { Ogre::MEMCATEGORY_GENERAL = 0, Ogre::MEMCATEGORY_GEOMETRY = 1, Ogre::MEMCATEGORY_ANIMATION = 2, Ogre::MEMCATEGORY_SCENE_CONTROL = 3, Ogre::MEMCATEGORY_SCENE_OBJECTS = 4, Ogre::MEMCATEGORY_RESOURCE = 5, Ogre::MEMCATEGORY_SCRIPTING = 6, Ogre::MEMCATEGORY_RENDERSYS = 7, Ogre::MEMCATEGORY_COUNT = 8 }
| A set of categories that indicate the purpose of a chunk of memory being allocated. More...

## Functions

template<typename T >
T * | Ogre::constructN (T *basePtr, size_t count)
| Utility function for constructing an array of objects with placement new, without using new[] (which allocates an undocumented amount of extra memory and so isn't appropriate for custom allocators).
template<typename T >
void | Ogre::deletePtr (T *ptr)
| Function which invokes OGRE_DELETE on a given pointer.

## Detailed Description

This file configures Ogre's memory allocators.

You can modify this file to alter the allocation routines used for Ogre's main objects.

When customising memory allocation, all you need to do is provide one or more custom allocation policy classes. These classes need to implement:

        // Allocate bytes - file/line/func information should be optional,
        // will be provided when available but not everywhere (e.g. release mode, STL allocations)
        static inline void* allocateBytes(size_t count, const char* file = 0, int line = 0, const char* func = 0);
        // Free bytes
        static inline void deallocateBytes(void* ptr);
        // Return the max number of bytes available to be allocated in a single allocation
        static inline size_t getMaxAllocationSize();

Policies are then used as implementations for the wrapper classes and macros which call them. AllocatedObject for example provides the hooks to override the new and delete operators for a class and redirect the functionality to the policy. STLAllocator is a class which is provided to STL containers in order to hook up allocation of the containers members to the allocation policy.

  In addition to linking allocations to policies, this class also defines a number of macros to allow debugging information to be passed along with allocations, such as the file and line number they originate from. It's important to realise that we do not redefine the 'new' and 'delete' symbols with macros, because that's very difficult to consistently do when other libraries are also trying to do the same thing; instead we use dedicated 'OGRE_' prefixed macros. See OGRE_NEW and related items.

  The base macros you can use are listed below, in order of preference and with their conditions stated:
  - OGRE_NEW - use to allocate an object which have custom new/delete operators to handle custom allocations, usually this means it's derived from Ogre::AllocatedObject. Free the memory using OGRE_DELETE. You can in fact use the regular new/delete for these classes but you won't get any line number debugging if you do. The memory category is automatically derived for these classes; for all other allocations you have to specify it.
  - OGRE_NEW_T - use to allocate a single class / struct that does not have custom new/delete operators, either because it is non-virtual (Vector3, Quaternion), or because it is from an external library (e.g. STL). You must deallocate with OGRE_DELETE_T if you expect the destructor to be called. You may free the memory using OGRE_FREE if you are absolutely sure there is no destructor to be called. These macros ensure that constructors and destructors are called correctly even though the memory originates externally (via placement new). Also note that you have to specify the type and memory category so that the correct allocator can be derived, when both allocating and freeing.
  - OGRE_NEW_ARRAY_T - as OGRE_NEW_T except with an extra parameter to construct multiple instances in contiguous memory. Again constructors and destructors are called. Free with OGRE_DELETE_ARRAY_T.
  - OGRE_ALLOC_T - use to allocate a set of primitive types conveniently with type safety. This can also be used for classes and structs but it is imperative that you understand that neither the constructor nor the destructor will be called. Sometimes you want this because it's more efficient just to grab/free a chunk of memory without having to iterate over each element constructing / destructing. Free the memory with OGRE_FREE.
  - OGRE_MALLOC - the most raw form of allocation, just a set of bytes. Use OGRE_FREE to release.
  - _SIMD and _ALIGN variants - all of the above have variations which allow aligned memory allocations. The _SIMD versions align automatically to the SIMD requirements of your platform, the _ALIGN variants allow user-defined alignment to be specified.
  Here are some examples:

          AllocatedClass* obj = OGRE_NEW AllocatedClass();
          OGRE_DELETE obj;
          AllocatedClass* array = OGRE_NEW AllocatedClass[10];
          OGRE_DELETE [] obj;
          ExternalClass* obj = OGRE_NEW_T(ExternalClass, MEMCATEGORY_GENERAL)(constructorArgs);
          OGRE_DELETE_T(obj, ExternalClass, MEMCATEGORY_GENERAL);
          ExternalClass* obj = OGRE_NEW_ARRAY_T(ExternalClass, 10, MEMCATEGORY_GENERAL);
          OGRE_DELETE_ARRAY_T(obj, NonVirtualClass, 10, MEMCATEGORY_GENERAL);
          long* pLong = OGRE_ALLOC_T(long, 10, MEMCATEGORY_GENERAL);
          OGRE_FREE(pLong, MEMCATEGORY_GENERAL);
          long* pLong = OGRE_NEW_T(long, MEMCATEGORY_GENERAL)(0);
          OGRE_FREE(pLong, MEMCATEGORY_GENERAL);
          void* pVoid = OGRE_MALLOC(1024, MEMCATEGORY_GENERAL);
          OGRE_FREE(pVoid, MEMCATEGORY_GENERAL);

  OGRE_ALLOC_T is also the route to go for allocating real primitive types like int & float. You free the memory using OGRE_FREE, and both variants have SIMD and custom alignment variants.

Definition in file OgreMemoryAllocatorConfig.h.

Copyright © 2008 Torus Knot Software Ltd
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Last modified Sun May 8 2011 20:28:09