f1acefa9a9PR-URL: https://github.com/nodejs/node/pull/60312 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
68 lines
2 KiB
C++
68 lines
2 KiB
C++
// Copyright 2019 The Chromium Authors
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#ifndef CRDTP_SPAN_H_
|
|
#define CRDTP_SPAN_H_
|
|
|
|
#include <cstdint>
|
|
#include <cstring>
|
|
#include <span>
|
|
#include <string>
|
|
#include <type_traits>
|
|
|
|
#include "export.h"
|
|
|
|
namespace crdtp {
|
|
|
|
// crdtp::span is a std::span which always holds const elements.
|
|
template <typename T>
|
|
using span = std::span<const T>;
|
|
|
|
template <size_t N>
|
|
constexpr span<char> MakeSpan(const char (&str)[N]) {
|
|
return span<char>(str, N - 1);
|
|
}
|
|
|
|
template <size_t N>
|
|
constexpr span<uint8_t> SpanFrom(const char (&str)[N]) {
|
|
return span<uint8_t>(reinterpret_cast<const uint8_t*>(str), N - 1);
|
|
}
|
|
|
|
constexpr inline span<uint8_t> SpanFrom(const char* str) {
|
|
return str ? span<uint8_t>(reinterpret_cast<const uint8_t*>(str), strlen(str))
|
|
: span<uint8_t>();
|
|
}
|
|
|
|
inline span<uint8_t> SpanFrom(const std::string& v) {
|
|
return span<uint8_t>(reinterpret_cast<const uint8_t*>(v.data()), v.size());
|
|
}
|
|
|
|
// This SpanFrom routine works for std::vector<uint8_t> and
|
|
// std::vector<uint16_t>, but also for base::span<const uint8_t> in Chromium.
|
|
template <typename C,
|
|
typename = std::enable_if_t<
|
|
std::is_unsigned<typename C::value_type>{} &&
|
|
std::is_member_function_pointer<decltype(&C::size)>{}>>
|
|
inline span<typename C::value_type> SpanFrom(const C& v) {
|
|
return span<typename C::value_type>(v.data(), v.size());
|
|
}
|
|
|
|
// Less than / equality comparison functions for sorting / searching for byte
|
|
// spans.
|
|
CRDTP_EXPORT bool SpanLessThan(span<uint8_t> x, span<uint8_t> y) noexcept;
|
|
CRDTP_EXPORT bool SpanEquals(span<uint8_t> x, span<uint8_t> y) noexcept;
|
|
|
|
// Less than / equality comparison functions for sorting / searching for byte
|
|
// spans.
|
|
CRDTP_EXPORT bool SpanLessThan(span<char> x, span<char> y) noexcept;
|
|
CRDTP_EXPORT bool SpanEquals(span<char> x, span<char> y) noexcept;
|
|
|
|
struct SpanLt {
|
|
bool operator()(span<uint8_t> l, span<uint8_t> r) const {
|
|
return SpanLessThan(l, r);
|
|
}
|
|
};
|
|
} // namespace crdtp
|
|
|
|
#endif // CRDTP_SPAN_H_
|