BitStream
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bits.h
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1#pragma once
2
3#include <cstddef>
4#include <cstdint>
5
7{
8 constexpr inline uint32_t bits_to_represent(uintmax_t n)
9 {
10 uint32_t r = 0;
11
12 if (n >> 32) { r += 32U; n >>= 32U; }
13 if (n >> 16) { r += 16U; n >>= 16U; }
14 if (n >> 8) { r += 8U; n >>= 8U; }
15 if (n >> 4) { r += 4U; n >>= 4U; }
16 if (n >> 2) { r += 2U; n >>= 2U; }
17 if (n >> 1) { r += 1U; n >>= 1U; }
18
19 return r + static_cast<uint32_t>(n);
20 }
21
22 constexpr inline uint32_t bits_in_range(intmax_t min, intmax_t max)
23 {
24 return bits_to_represent(static_cast<uintmax_t>(max) - static_cast<uintmax_t>(min));
25 }
26}
Definition bits.h:7
constexpr uint32_t bits_in_range(intmax_t min, intmax_t max)
Definition bits.h:22
constexpr uint32_t bits_to_represent(uintmax_t n)
Definition bits.h:8