rust_extra/powersOfTwo/
PowerOfTwoSixteenBit.rs

1// This file is part of dpdk. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT. No part of dpdk, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
2// Copyright © 2016 The developers of dpdk. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT.
3
4
5#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
6#[repr(u16)]
7pub enum PowerOfTwoSixteenBit
8{
9	_1 = 1,
10	_2 = 2,
11	_4 = 4,
12	_8 = 8,
13	_16 = 16,
14	_32 = 32,
15	_64 = 64,
16	_128 = 128,
17	_256 = 256,
18	_512 = 512,
19	_1024 = 1024,
20	_2048 = 2048,
21	_4096 = 4096,
22	_8192 = 8192,
23	_16384 = 16384,
24	_32768 = 32768,
25}
26
27impl PowerOfTwoSixteenBit
28{
29	// Does not check for value == 0 (that is not a power of two)
30	#[inline(always)]
31	pub fn isPowerOfTwo(value: u16) -> bool
32	{
33		debug_assert!(value != 0, "zero is not a valid power of two");
34		
35	    (value & (value - 1)) == 0
36	}
37	
38	#[inline(always)]
39	pub unsafe fn from_u16_unchecked(value: u16) -> PowerOfTwoSixteenBit
40	{
41		debug_assert!(value != 0, "zero is not a valid power of two");
42		
43		transmute(value)
44	}
45	
46	#[inline(always)]
47	pub unsafe fn from_u16_panic(value: u16) -> PowerOfTwoSixteenBit
48	{
49		match value
50		{
51			0 => panic!("Zero is not converted"),
52			
53			1 => PowerOfTwoSixteenBit::_1,
54			2 => PowerOfTwoSixteenBit::_2,
55			4 => PowerOfTwoSixteenBit::_4,
56			8 => PowerOfTwoSixteenBit::_8,
57			16 => PowerOfTwoSixteenBit::_16,
58			32 => PowerOfTwoSixteenBit::_32,
59			64 => PowerOfTwoSixteenBit::_64,
60			128 => PowerOfTwoSixteenBit::_128,
61			256 => PowerOfTwoSixteenBit::_256,
62			512 => PowerOfTwoSixteenBit::_512,
63			1024 => PowerOfTwoSixteenBit::_1024,
64			2048 => PowerOfTwoSixteenBit::_2048,
65			4096 => PowerOfTwoSixteenBit::_4096,
66			8192 => PowerOfTwoSixteenBit::_8192,
67			16384 => PowerOfTwoSixteenBit::_16384,
68			32768 => PowerOfTwoSixteenBit::_32768,
69			
70			_ => panic!("The value '{}' is not a power of two", value),
71		}
72	}
73	
74	#[inline(always)]
75	pub unsafe fn from_u16_panic_withZeroAs<F>(value: u16, zeroIs: F) -> PowerOfTwoSixteenBit
76	where F: Fn() -> PowerOfTwoSixteenBit
77	{
78		match value
79		{
80			0 => zeroIs(),
81			
82			1 => PowerOfTwoSixteenBit::_1,
83			2 => PowerOfTwoSixteenBit::_2,
84			4 => PowerOfTwoSixteenBit::_4,
85			8 => PowerOfTwoSixteenBit::_8,
86			16 => PowerOfTwoSixteenBit::_16,
87			32 => PowerOfTwoSixteenBit::_32,
88			64 => PowerOfTwoSixteenBit::_64,
89			128 => PowerOfTwoSixteenBit::_128,
90			256 => PowerOfTwoSixteenBit::_256,
91			512 => PowerOfTwoSixteenBit::_512,
92			1024 => PowerOfTwoSixteenBit::_1024,
93			2048 => PowerOfTwoSixteenBit::_2048,
94			4096 => PowerOfTwoSixteenBit::_4096,
95			8192 => PowerOfTwoSixteenBit::_8192,
96			16384 => PowerOfTwoSixteenBit::_16384,
97			32768 => PowerOfTwoSixteenBit::_32768,
98			
99			_ => panic!("The value '{}' is not a power of two", value),
100		}
101	}
102	
103	#[inline(always)]
104	pub unsafe fn from_u16(value: u16) -> Option<PowerOfTwoSixteenBit>
105	{
106		match value
107		{
108			0 => None,
109			
110			1 => Some(PowerOfTwoSixteenBit::_1),
111			2 => Some(PowerOfTwoSixteenBit::_2),
112			4 => Some(PowerOfTwoSixteenBit::_4),
113			8 => Some(PowerOfTwoSixteenBit::_8),
114			16 => Some(PowerOfTwoSixteenBit::_16),
115			32 => Some(PowerOfTwoSixteenBit::_32),
116			64 => Some(PowerOfTwoSixteenBit::_64),
117			128 => Some(PowerOfTwoSixteenBit::_128),
118			256 => Some(PowerOfTwoSixteenBit::_256),
119			512 => Some(PowerOfTwoSixteenBit::_512),
120			1024 => Some(PowerOfTwoSixteenBit::_1024),
121			2048 => Some(PowerOfTwoSixteenBit::_2048),
122			4096 => Some(PowerOfTwoSixteenBit::_4096),
123			8192 => Some(PowerOfTwoSixteenBit::_8192),
124			16384 => Some(PowerOfTwoSixteenBit::_16384),
125			32768 => Some(PowerOfTwoSixteenBit::_32768),
126			
127			_ => None,
128		}
129	}
130}
rust_extra/powersOfTwo/PowerOfTwoSixteenBit.rs

rust_extra/powersOfTwo/
PowerOfTwoSixteenBit.rs
