tdlight/tdutils/td/utils/Span.h
Arseny Smirnov 093651fb22 Update tdutils from other project
GitOrigin-RevId: 83ec94032ccecef812b01963ac0506655a57e2af
2018-08-13 20:15:09 +03:00

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