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#ifndef LF_POOL_DISPATCHER
#define LF_POOL_DISPATCHER
#include <tuple>
#include <cassert>
#include <cstddef>
#include <lfpAlloc/Pool.hpp>
#ifndef LFP_ALLOCATIONS_PER_CHUNK
#define LFP_ALLOCATIONS_PER_CHUNK 64 * 100
#endif
namespace lfpAlloc {
namespace detail {
template <std::size_t Num, uint16_t... Ts>
struct Pools : Pools<Num - 1, alignof(std::max_align_t) * Num, Ts...> {};
template <uint16_t... Size>
struct Pools<0, Size...> {
using type = std::tuple<Pool<Size, LFP_ALLOCATIONS_PER_CHUNK>...>;
};
}
template <std::size_t NumPools>
class PoolDispatcher {
public:
void* allocate(std::size_t size) { return dispatchAllocate<0>(size); }
void deallocate(void* p, std::size_t size) noexcept {
dispatchDeallocate<0>(p, size);
}
private:
thread_local static typename detail::Pools<NumPools>::type pools_;
static_assert(NumPools > 0, "Invalid number of pools");
template <std::size_t Index>
typename std::enable_if <
Index<NumPools, void*>::type
dispatchAllocate(std::size_t const& requestSize) {
if (requestSize <= std::get<Index>(pools_).CellSize) {
return std::get<Index>(pools_).allocate();
} else {
return dispatchAllocate<Index + 1>(requestSize);
}
}
template <std::size_t Index>
typename std::enable_if<!(Index < NumPools), void*>::type
dispatchAllocate(std::size_t const&) {
assert(false && "Invalid allocation size.");
return nullptr;
}
template <std::size_t Index>
typename std::enable_if <
Index<NumPools>::type
dispatchDeallocate(void* p, std::size_t const& requestSize) noexcept {
if (requestSize <= std::get<Index>(pools_).CellSize) {
std::get<Index>(pools_).deallocate(p);
} else {
dispatchDeallocate<Index + 1>(p, requestSize);
}
}
template <std::size_t Index>
typename std::enable_if<!(Index < NumPools)>::type
dispatchDeallocate(void*, std::size_t const&) noexcept {
assert(false && "Invalid deallocation size.");
}
};
template <std::size_t NumPools>
thread_local typename detail::Pools<NumPools>::type
PoolDispatcher<NumPools>::pools_;
}
#endif
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