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/********************* */
/*! \file index.cpp
** \verbatim
** Top contributors (to current version):
** Tim King
** This file is part of the CVC4 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.\endverbatim
**
** \brief [[ Add one-line brief description here ]]
**
** [[ Add lengthier description here ]]
** \todo document this file
**/
#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
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