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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef EIGEN_FIXEDSIZEVECTOR_H
#define EIGEN_FIXEDSIZEVECTOR_H
namespace Eigen {
/** \class MaxSizeVector
* \ingroup Core
*
* \brief The MaxSizeVector class.
*
* The %MaxSizeVector provides a subset of std::vector functionality.
*
* The goal is to provide basic std::vector operations when using
* std::vector is not an option (e.g. on GPU or when compiling using
* FMA/AVX, as this can cause either compilation failures or illegal
* instruction failures).
*
* Beware: The constructors are not API compatible with these of
* std::vector.
*/
template <typename T>
class MaxSizeVector {
static const size_t alignment = EIGEN_PLAIN_ENUM_MAX(EIGEN_ALIGNOF(T), sizeof(void*));
public:
// Construct a new MaxSizeVector, reserve n elements.
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
explicit MaxSizeVector(size_t n)
: reserve_(n), size_(0),
data_(static_cast<T*>(internal::handmade_aligned_malloc(n * sizeof(T), alignment))) {
}
// Construct a new MaxSizeVector, reserve and resize to n.
// Copy the init value to all elements.
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
MaxSizeVector(size_t n, const T& init)
: reserve_(n), size_(n),
data_(static_cast<T*>(internal::handmade_aligned_malloc(n * sizeof(T), alignment))) {
size_t i = 0;
EIGEN_TRY
{
for(; i < size_; ++i) { new (&data_[i]) T(init); }
}
EIGEN_CATCH(...)
{
// Construction failed, destruct in reverse order:
for(; (i+1) > 0; --i) { data_[i-1].~T(); }
internal::handmade_aligned_free(data_);
EIGEN_THROW;
}
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
~MaxSizeVector() {
for (size_t i = size_; i > 0; --i) {
data_[i-1].~T();
}
internal::handmade_aligned_free(data_);
}
void resize(size_t n) {
eigen_assert(n <= reserve_);
for (; size_ < n; ++size_) {
new (&data_[size_]) T;
}
for (; size_ > n; --size_) {
data_[size_-1].~T();
}
eigen_assert(size_ == n);
}
// Append new elements (up to reserved size).
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
void push_back(const T& t) {
eigen_assert(size_ < reserve_);
new (&data_[size_++]) T(t);
}
// For C++03 compatibility this only takes one argument
template<class X>
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
void emplace_back(const X& x) {
eigen_assert(size_ < reserve_);
new (&data_[size_++]) T(x);
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
const T& operator[] (size_t i) const {
eigen_assert(i < size_);
return data_[i];
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
T& operator[] (size_t i) {
eigen_assert(i < size_);
return data_[i];
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
T& back() {
eigen_assert(size_ > 0);
return data_[size_ - 1];
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
const T& back() const {
eigen_assert(size_ > 0);
return data_[size_ - 1];
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
void pop_back() {
eigen_assert(size_ > 0);
data_[--size_].~T();
}
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
size_t size() const { return size_; }
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
bool empty() const { return size_ == 0; }
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
T* data() { return data_; }
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
const T* data() const { return data_; }
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
T* begin() { return data_; }
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
T* end() { return data_ + size_; }
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
const T* begin() const { return data_; }
EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE
const T* end() const { return data_ + size_; }
private:
size_t reserve_;
size_t size_;
T* data_;
};
} // namespace Eigen
#endif // EIGEN_FIXEDSIZEVECTOR_H
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