problem with raw array as value type

[steffenheyne]

Hi, I want to use the pool allocator for thousands of small arrays:

typedef uint16_t elementType; typedef elementType* arrayP;

typedef elementType array_2[2]; MemoryPool<array_2> mMemPool_2;

arrayP foo; foo = reinterpret_cast<elementType(*)>(mMemPool_2->newElement()); ... mMemPool_2->deleteElement(reinterpret_cast<array_2(*)>(foo));

(the recast I do because I need always foo-like elements because I put the pointers in a hashmap, I take care of the size of the array myself, i.e. I store the length at[0])

With that I always get an compile error in the deleteElement function. When I comment out the call to the destructor (placement new destructor?) it works.

template <typename T, size_t BlockSize> inline void MemoryPool<T, BlockSize>::deleteElement(pointer p) { if (p != nullptr) { // p->~value_type(); deallocate(p); } }

Why is that and is it correct in my special case? Thanks! steffen

the compile error (gcc 4.8.1):

MemoryPool.tcc: In instantiation of ‘void MemoryPool<T, BlockSize>::deleteElement(MemoryPool<T, BlockSize>::pointer) [with T = short unsigned int [2]; long unsigned int BlockSize = 1966080ul; MemoryPool<T, BlockSize>::pointer = short unsigned int ()[2]]’: MinHashEncoder.h:310:84: required from here MemoryPool.tcc:228:4: error: request for member ‘~MemoryPool<short unsigned int [2], 1966080ul>::value_type’ in ‘ p’, which is of non-class type ‘short unsigned int [2]’ p->~value_type();