89 lines
1.8 KiB
C++
89 lines
1.8 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*
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* A `blender::VectorAdaptor` is a container with a fixed maximum size and does not own the
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* underlying memory. When an adaptor is constructed, you have to provide it with an uninitialized
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* array that will be filled when elements are added to the vector. The vector adaptor is not able
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* to grow. Therefore, it is undefined behavior to add more elements than fit into the provided
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* buffer.
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*/
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#include "BLI_span.hh"
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namespace blender {
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template<typename T> class VectorAdaptor {
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private:
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T *begin_;
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T *end_;
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T *capacity_end_;
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public:
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VectorAdaptor() : begin_(nullptr), end_(nullptr), capacity_end_(nullptr)
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{
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}
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VectorAdaptor(T *data, int64_t capacity, int64_t size = 0)
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: begin_(data), end_(data + size), capacity_end_(data + capacity)
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{
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}
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VectorAdaptor(MutableSpan<T> span) : VectorAdaptor(span.data(), span.size(), 0)
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{
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}
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void append(const T &value)
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{
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BLI_assert(end_ < capacity_end_);
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new (end_) T(value);
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end_++;
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}
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void append(T &&value)
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{
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BLI_assert(end_ < capacity_end_);
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new (end_) T(std::move(value));
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end_++;
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}
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void append_n_times(const T &value, int64_t n)
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{
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BLI_assert(end_ + n <= capacity_end_);
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uninitialized_fill_n(end_, n, value);
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end_ += n;
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}
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void extend(Span<T> values)
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{
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BLI_assert(end_ + values.size() <= capacity_end_);
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uninitialized_copy_n(values.data(), values.size(), end_);
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end_ += values.size();
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}
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int64_t capacity() const
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{
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return capacity_end_ - begin_;
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}
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int64_t size() const
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{
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return end_ - begin_;
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}
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bool is_empty() const
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{
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return begin_ == end_;
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}
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bool is_full() const
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{
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return end_ == capacity_end_;
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}
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};
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} // namespace blender
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