79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// This file is copied from
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// https://github.com/ClickHouse/ClickHouse/blob/master/src/Common/formatIPv6.cpp
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// and modified by Doris
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#include "vec/common/format_ip.h"
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#include <algorithm>
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#include <array>
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#include "vec/core/types.h"
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namespace doris::vectorized {
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/** Further we want to generate constexpr array of strings with sizes from sequence of unsigned ints [0..N)
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* in order to use this arrey for fast conversion of unsigned integers to strings
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*/
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namespace detail {
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template <unsigned... digits>
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struct ToChars {
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static const char value[];
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static const size_t size;
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};
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template <unsigned... digits>
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constexpr char ToChars<digits...>::value[] = {('0' + digits)..., 0};
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template <unsigned... digits>
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constexpr size_t ToChars<digits...>::size = sizeof...(digits);
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template <unsigned rem, unsigned... digits>
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struct Decompose : Decompose<rem / 10, rem % 10, digits...> {};
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template <unsigned... digits>
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struct Decompose<0, digits...> : ToChars<digits...> {};
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template <>
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struct Decompose<0> : ToChars<0> {};
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template <unsigned num>
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struct NumToString : Decompose<num> {};
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template <class T, T... ints>
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consteval std::array<std::pair<const char*, size_t>, sizeof...(ints)> str_make_array_impl(
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std::integer_sequence<T, ints...>) {
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return std::array<std::pair<const char*, size_t>, sizeof...(ints)> {
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std::pair<const char*, size_t> {NumToString<ints>::value, NumToString<ints>::size}...};
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}
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} // namespace detail
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/** str_make_array<N>() - generates static array of std::pair<const char *, size_t> for numbers [0..N), where:
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* first - null-terminated string representing number
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* second - size of the string as would returned by strlen()
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*/
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template <size_t N>
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consteval std::array<std::pair<const char*, size_t>, N> str_make_array() {
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return detail::str_make_array_impl(std::make_integer_sequence<int, N> {});
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}
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/// This will generate static array of pair<const char *, size_t> for [0..255] at compile time
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extern constexpr std::array<std::pair<const char*, size_t>, 256> one_byte_to_string_lookup_table =
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str_make_array<256>();
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} // namespace doris::vectorized
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