What is wrong with this code ? (template class)

[Anonymous]

I have been trying to write a template class for a shared memory
container, over the last few days - but I keep getting numerous compiler
errors e.g:


Error: syntax error : identifier 'myStaticShmemAllocator<void>'
Error: 'AllocationPolicy' : undeclared identifier


Here is the truncated code below -

// template Header file
extern shared_memory static_shmem;
extern shared_memory dyn_shmem;


template <class T>
struct myStaticShmemAllocator
{
static T* Allocate(const size_t blocksize, const bool zeroed=true)
{
return static_shmem.allocate(blocksize, zeroed);
}

static void DeAllocate(T *ptr)
{
if(ptr);
static_shmem.free(ptr) ;
}
};



template <class T>
struct myDynamicShmemAllocator
{
static T* Allocate(const size_t blocksize, const bool zeroed=true)
{
return dyn_shmem.allocate(blocksize, zeroed);
}

static void DeAllocate(T *ptr)
{
if(ptr);
dyn_shmem.free(ptr) ;
}
};



template <class ValueType, template <class SharedMemoryType> class
AllocationPolicy= myStaticShmemAllocator<void> >
class static_shmemHashTable
{
//Impl
};


//////// Code to test templates
struct MyStruct { int x; int y;};

int main(int argc, char* argv[])
{
//implicit creation in static shmem (using dflt tplt arg)
myShmemHashTable<MyStruct> a_static ;

//explicit creation in static shmem
myShmemHashTable<MyStruct, myStaticShmemAllocator<void> > a1_static ;

//explicit creation in dynamic shmem
myShmemHashTable<MyStruct, myDynamicShmemAllocator<void> > a_dynamic;
}

 

[xtrigger303]

I have been trying to write a template class for a shared memory
container, over the last few days - but I keep getting numerous compiler
errors e.g:

Error: syntax error : identifier 'myStaticShmemAllocator<void>'
Error: 'AllocationPolicy' : undeclared identifier

Here is the truncated code below -

// template Header file
extern shared_memory static_shmem;
extern shared_memory dyn_shmem;

template <class T>
struct myStaticShmemAllocator
{
static T* Allocate(const size_t blocksize, const bool zeroed=true)
{
return static_shmem.allocate(blocksize, zeroed);
}

static void DeAllocate(T *ptr)
{
if(ptr);
static_shmem.free(ptr) ;
}

};

template <class T>
struct myDynamicShmemAllocator
{
static T* Allocate(const size_t blocksize, const bool zeroed=true)
{
return dyn_shmem.allocate(blocksize, zeroed);
}

static void DeAllocate(T *ptr)
{
if(ptr);
dyn_shmem.free(ptr) ;
}

};

template <class ValueType, template <class SharedMemoryType> class
AllocationPolicy= myStaticShmemAllocator<void> >
class static_shmemHashTable
{
//Impl

};

//////// Code to test templates
struct MyStruct { int x; int y;};

int main(int argc, char* argv[])
{
//implicit creation in static shmem (using dflt tplt arg)
myShmemHashTable<MyStruct> a_static ;

//explicit creation in static shmem
myShmemHashTable<MyStruct, myStaticShmemAllocator<void> > a1_static ;

//explicit creation in dynamic shmem
myShmemHashTable<MyStruct, myDynamicShmemAllocator<void> > a_dynamic;



}- Hide quoted text -

- Show quoted text -
IMHO

template <class ValueType, template <class SharedMemoryType> class
AllocationPolicy= myStaticShmemAllocator<void> >
class static_shmemHashTable

this should become

template <class ValueType, template <class SharedMemoryType> class
AllocationPolicy= myStaticShmemAllocator >
class static_shmemHashTable

since it's a template< typename > class you should not specifiy the
templated typename or else you're giving a precise type not a
templated class

also the code down below should be stripped of <void> after
myStaticShmemAllocator and myDynamicShmemAllocator

Hope it helps.
FB