blob: d9fea498f1abbd4428c62928b7268589ea0d4b8b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
/******************************************************************************
* Top contributors (to current version):
* Tim King
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
* in the top-level source directory and their institutional affiliations.
* All rights reserved. See the file COPYING in the top-level source
* directory for licensing information.
* ****************************************************************************
*
* Standardized type for efficient array indexing.
*/
#include "util/index.h"
#include <limits>
namespace cvc5 {
static_assert(sizeof(Index) <= sizeof(size_t),
"Index cannot be larger than size_t");
static_assert(!std::numeric_limits<Index>::is_signed,
"Index must be unsigned");
/* Discussion: Why is Index a uint32_t instead of size_t (or uint_fast32_t)?
*
* size_t is a more appropriate choice than uint32_t as the choice is dictated
* by uniqueness in arrays and vectors. These correspond to size_t. However, the
* using size_t with a sizeof == 8 on 64 bit platforms is noticeably slower.
* (Limited testing suggests a ~1/16 of running time.) Interestingly,
* uint_fast32_t also has a sizeof == 8 on x86_64.
*/
} // namespace cvc5
|
