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/********************* */
/*! \file index.h
** \verbatim
** Top contributors (to current version):
** Tim King, Morgan Deters, Paul Meng
** This file is part of the CVC4 project.
** Copyright (c) 2009-2017 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 "cvc4_private.h"
#pragma once
#include <stdint.h>
#include <boost/static_assert.hpp>
#include <limits>
namespace CVC4 {
/**
* Index is an unsigned integer used for array indexing.
*
* This gives a standardized type for independent pieces of code to use as an agreement.
*/
typedef uint32_t Index;
BOOST_STATIC_ASSERT(sizeof(Index) <= sizeof(size_t));
BOOST_STATIC_ASSERT(!std::numeric_limits<Index>::is_signed);
/* 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. Filthy Liars!)
*/
}/* CVC4 namespace */
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