/usr/include/stxxl/bits/common/tmeta.h is in libstxxl-dev 1.4.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* include/stxxl/bits/common/tmeta.h
*
* Template Metaprogramming Tools
* (from the Generative Programming book Krysztof Czarnecki, Ulrich Eisenecker)
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2003 Roman Dementiev <dementiev@mpi-sb.mpg.de>
* Copyright (C) 2008 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#ifndef STXXL_COMMON_TMETA_HEADER
#define STXXL_COMMON_TMETA_HEADER
#include <stxxl/bits/namespace.h>
#include <stxxl/bits/common/types.h>
STXXL_BEGIN_NAMESPACE
//! IF template metaprogramming statement.
//!
//! If \c Flag is \c true then \c IF<>::result is of type Type1
//! otherwise of \c IF<>::result is of type Type2
template <bool Flag, class Type1, class Type2>
struct IF
{
typedef Type1 result;
};
template <class Type1, class Type2>
struct IF<false, Type1, Type2>
{
typedef Type2 result;
};
//! If \c Flag is \c true then \c IF<>::result is Num1
//! otherwise of \c IF<>::result is Num2
template <bool Flag, unsigned Num1, unsigned Num2>
struct IF_N
{
enum
{
result = Num1
};
};
template <unsigned Num1, unsigned Num2>
struct IF_N<false, Num1, Num2>
{
enum
{
result = Num2
};
};
const int DEFAULT = ~(~0u >> 1); // initialize with the smallest int
struct NilCase { };
template <int tag_, class Type_, class Next_ = NilCase>
struct CASE
{
enum { tag = tag_ };
typedef Type_ Type;
typedef Next_ Next;
};
template <int tag, class Case>
class SWITCH
{
typedef typename Case::Next NextCase;
enum
{
caseTag = Case::tag,
found = (caseTag == tag || caseTag == DEFAULT)
};
public:
typedef typename IF<found,
typename Case::Type,
typename SWITCH<tag, NextCase>::result
>::result result;
};
template <int tag>
class SWITCH<tag, NilCase>
{
public:
typedef NilCase result;
};
//! \internal, use LOG2 instead
template <unsigned_type Input>
class LOG2_floor
{
public:
enum
{
value = LOG2_floor<Input / 2>::value + 1
};
};
template <>
class LOG2_floor<1>
{
public:
enum
{
value = 0
};
};
template <>
class LOG2_floor<0>
{
public:
enum
{
value = 0
};
};
template <unsigned_type Input>
class LOG2
{
public:
enum
{
floor = LOG2_floor<Input>::value,
ceil = LOG2_floor<Input - 1>::value + 1
};
};
template <>
class LOG2<1>
{
public:
enum
{
floor = 0,
ceil = 0
};
};
template <>
class LOG2<0>
{
public:
enum
{
floor = 0,
ceil = 0
};
};
STXXL_END_NAMESPACE
#endif // !STXXL_COMMON_TMETA_HEADER
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