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#pragma once
#include <cstdlib>
#include <new>
#ifdef _MSC_VER
#include <malloc.h>
#endif
// Aligned simple vector.
namespace intgemm {
template <class T> class AlignedVector {
public:
AlignedVector() : mem_(nullptr), size_(0) {}
explicit AlignedVector(std::size_t size, std::size_t alignment = 64 /* CPU cares about this */)
: size_(size) {
#ifdef _MSC_VER
mem_ = static_cast<T*>(_aligned_malloc(size * sizeof(T), alignment));
if (!mem_) throw std::bad_alloc();
#else
if (posix_memalign(reinterpret_cast<void **>(&mem_), alignment, size * sizeof(T))) {
throw std::bad_alloc();
}
#endif
}
AlignedVector(AlignedVector &&from) : mem_(from.mem_), size_(from.size_) {
from.mem_ = nullptr;
from.size_ = 0;
}
AlignedVector &operator=(AlignedVector &&from) {
mem_ = from.mem_;
size_ = from.size_;
from.mem_ = nullptr;
from.size_ = 0;
return *this;
}
AlignedVector(const AlignedVector&) = delete;
AlignedVector& operator=(const AlignedVector&) = delete;
~AlignedVector() {
#ifdef _MSC_VER
_aligned_free(mem_);
#else
std::free(mem_);
#endif
}
std::size_t size() const { return size_; }
T &operator[](std::size_t offset) { return mem_[offset]; }
const T &operator[](std::size_t offset) const { return mem_[offset]; }
T *begin() { return mem_; }
const T *begin() const { return mem_; }
T *end() { return mem_ + size_; }
const T *end() const { return mem_ + size_; }
template <typename ReturnType>
ReturnType *as() { return reinterpret_cast<ReturnType*>(mem_); }
private:
T *mem_;
std::size_t size_;
};
} // namespace intgemm
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