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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#ifndef _COMMON_DEFS_HPP_
#define _COMMON_DEFS_HPP_
#include <cstdint>
#include <string>
#include <memory>
namespace datasketches {
static const uint64_t DEFAULT_SEED = 9001;
template<typename A> using AllocChar = typename std::allocator_traits<A>::template rebind_alloc<char>;
template<typename A> using string = std::basic_string<char, std::char_traits<char>, AllocChar<A>>;
// utility function to hide unused compiler warning
// usually has no additional cost
template<typename T> void unused(T&&...) {}
// common helping functions
// TODO: find a better place for them
constexpr uint8_t log2(uint32_t n) {
return (n > 1) ? 1 + log2(n >> 1) : 0;
}
constexpr uint8_t lg_size_from_count(uint32_t n, double load_factor) {
return log2(n) + ((n > static_cast<uint32_t>((1 << (log2(n) + 1)) * load_factor)) ? 2 : 1);
}
} // namespace
#endif // _COMMON_DEFS_HPP_
Version data entries
5 entries across 5 versions & 1 rubygems