84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
//
|
|
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
#pragma once
|
|
#include "td/utils/Status.h"
|
|
|
|
namespace td {
|
|
namespace detail {
|
|
template <class T, class InnerT>
|
|
class SpanImpl {
|
|
private:
|
|
InnerT *data_{nullptr};
|
|
size_t size_{0};
|
|
|
|
public:
|
|
SpanImpl() = default;
|
|
SpanImpl(InnerT *data, size_t size) : data_(data), size_(size) {
|
|
}
|
|
SpanImpl(InnerT &data) : SpanImpl(&data, 1) {
|
|
}
|
|
SpanImpl(const SpanImpl &other) = default;
|
|
SpanImpl &operator=(const SpanImpl &other) = default;
|
|
|
|
template <class OtherInnerT>
|
|
SpanImpl(const SpanImpl<T, OtherInnerT> &other) : SpanImpl(other.data(), other.size()) {
|
|
}
|
|
|
|
template <size_t N>
|
|
SpanImpl(const std::array<T, N> &arr) : SpanImpl(arr.data(), arr.size()) {
|
|
}
|
|
template <size_t N>
|
|
SpanImpl(std::array<T, N> &arr) : SpanImpl(arr.data(), arr.size()) {
|
|
}
|
|
SpanImpl(const std::vector<T> &v) : SpanImpl(v.data(), v.size()) {
|
|
}
|
|
SpanImpl(std::vector<T> &v) : SpanImpl(v.data(), v.size()) {
|
|
}
|
|
|
|
template <class OtherInnerT>
|
|
SpanImpl &operator=(const SpanImpl<T, OtherInnerT> &other) {
|
|
SpanImpl copy{other};
|
|
*this = copy;
|
|
}
|
|
|
|
InnerT &operator[](size_t i) {
|
|
DCHECK(i < size());
|
|
return data_[i];
|
|
}
|
|
|
|
InnerT *data() const {
|
|
return data_;
|
|
}
|
|
InnerT *begin() const {
|
|
return data_;
|
|
}
|
|
InnerT *end() const {
|
|
return data_ + size_;
|
|
}
|
|
size_t size() const {
|
|
return size_;
|
|
}
|
|
|
|
SpanImpl &truncate(size_t size) {
|
|
CHECK(size <= size_);
|
|
size_ = size;
|
|
return *this;
|
|
}
|
|
|
|
SpanImpl substr(size_t offset) {
|
|
CHECK(offset <= size_);
|
|
return SpanImpl(begin() + offset, size_ - offset);
|
|
}
|
|
};
|
|
} // namespace detail
|
|
template <class T>
|
|
using Span = detail::SpanImpl<T, const T>;
|
|
|
|
template <class T>
|
|
using MutableSpan = detail::SpanImpl<T, T>;
|
|
}; // namespace td
|