/usr/include/ncl/nxsutilcopy.h is in libncl-dev 2.1.18+dfsg-2+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// This file is part of NCL (Nexus Class Library) version 2.1
//
// NCL is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// NCL is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with NCL; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// This code is based on code developed by Mark Holder for the CIPRES project
// Much of this file comes from Andrei Alexandrescu "Modern C++ Design"
#if !defined NXS_UTIL_COPY_H
#define NXS_UTIL_COPY_H
#include <algorithm>
#include <cstring>
#if defined(_MSC_VER)
# undef HAVE_COMPILE_TIME_DISPATCH
#else
# define HAVE_COMPILE_TIME_DISPATCH
#endif
////////////////////////////////////////////////////////////////////////////////
/// Int2Type<compile time constant integer> defines a unique (and stateless)
/// class associated with a given integer. Used for compile time dispatching
/// of function calls or creation of appropriate templated classes.
///
/// defines an unnamed enum "value" that is equal to the integer used to
/// define the class.
/// \author Andrei Alexandrescu "Modern C++ Design"
//////////
template<int v>
class Int2Type
{
public:
enum {value = v};
};
typedef Int2Type<true> TrueAsAType;
typedef Int2Type<false> FalseAsAType;
////////////////////////////////////////////////////////////////////////////////
/// Type2Type<typename> defines a unique (and stateless) class for each type
/// that is specified as the template argument.
/// This is useful in controlling the return type of templated functions in
/// lieu of partial template specialization of templated functions (which is
/// not allowed by the C++ standard)
/// Defines the typedef OriginalType which corresponds to the template argument
/// \author Andrei Alexandrescu "Modern C++ Design"
//////////
template<typename T>
class Type2Type
{
public:
typedef T OriginalType;
};
namespace ncl
{
namespace hidden
{
// used by #COMPILE_TIME_ASSERT
template<bool> struct CompileTimeChecker
{
CompileTimeChecker(...); //default
};
// used by #COMPILE_TIME_ASSERT
template<> struct CompileTimeChecker<false>{};
}
}
////////////////////////////////////////////////////////////////////////////////
/// \def COMPILE_TIME_ASSERT(condition, msg)
/// \brief A error-detection macro for asserting that conditions are true at compile time.
///
/// Usage:
///
/// COMPILE_TIME_ASSERT(condition to test, error_clue)
///
/// \note The error_clue must be one alphanumeric word (no spaces of punctaution).
/// The condition to test must be known at compile time (if not a cryptic message such as "illegal non-type template argument"
/// error will be generated.
/// If the compile time assertion evaluates to false, a message such as "Illegal conversion
/// from ERROR_error_clue to CompileTimeChecker<false> ..." will be generated.
///
/// Implementation Details:
///
/// ncl::hidden::CompileTimeChecker is a boolean-templated class.
/// The constructor of ncl::hidden::CompileTimeChecker<true> accepts any type
/// The the only constructor for ncl::hidden::CompileTimeChecker<false> is the default constructor
/// The macro COMPILE_TIME_ASSERT(condition, msg):
/// 1 Declares a dummy class ERROR_msg
/// 2 checks if it can instantiate CompileTimeChecker<condition> from an ERROR_msg type object.
/// If the condition is true, the construction will succeed, if not the error message will be generated
/// Note that while the CompileTimeChecker exists in ncl::hidden:: namespace. The macro is visible
/// by any file that includes compile_assert.h and the class such as ERROR_msg will be added to the global
/// namespace.
/// The resultign code is not affected by the insertion of COMPILE_TIME_ASSERT because the entire construction
/// is inside a sizeof() so no objects are really instantiated.
///
/// \author Andrei Alexandrescu "Modern C++ Design"
///
//////////
#define COMPILE_TIME_ASSERT(condition, msg) {class ERROR_##msg {}; (void)sizeof(ncl::hidden::CompileTimeChecker<(condition)>(ERROR_##msg()));}
#if defined(HAVE_COMPILE_TIME_DISPATCH)
template<typename T> struct SupportsBitwiseCopy { enum {kResult = false}; };
template<typename T> struct SupportsBitwiseCopy<T*> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<short int> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<int> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<char> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<long int> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<double> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<unsigned short int> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<unsigned int> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<unsigned char> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<unsigned long int> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<bool> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<wchar_t> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<float> { enum {kResult = true}; };
template<> struct SupportsBitwiseCopy<long double> { enum {kResult = true}; };
// This file uses tricks discussed in Andrei Alexandrescu's book to
// implement a call to memcpy for primitive types or any class which
// has the statement template<> struct SupportsBitwiseCopy<CLASS> { enum {kResult = true}; };
// because of potential portability issues with TypeList, primitive types are
// have SupportsBitwiseCopy specialized here by brute force enumeration
class NullType {};
template <typename T>
class TypeTraits
{
private :
template <class U> struct PointerTraits
{
enum {kResult = false};
enum {kCopyWithMemCopy = false}; // only allowing memcpy on bare pointers
enum {kSizeOfPointee = 0}; // only allowing memcpy on bare pointers
};
template <class U> struct PointerTraits<U*>
{
enum {kResult = true};
enum {kCopyWithMemCopy = SupportsBitwiseCopy<U>::kResult};
enum {kSizeOfPointee = sizeof(U)};
};
template <class U> struct PointerTraits<const U*>
{
enum {kResult = true};
enum {kCopyWithMemCopy = SupportsBitwiseCopy<U>::kResult};
enum {kSizeOfPointee = sizeof(U)};
};
public:
enum {kIsPointer = PointerTraits<T>::kResult};
enum {kCanUseMemCpyOnPointee = PointerTraits<T>::kCopyWithMemCopy};
enum {kPointeeSize = PointerTraits<T>::kSizeOfPointee}; //only valid if kIsPointer !!
// typedef PointerTraits<T>::PointeeType PointeeType;
};
template<class T, class U>
class Conversion
{
public:
enum {kSameType = false};
};
template<class T>
class Conversion<T,T>
{
public:
enum {kSameType = true};
};
template<class T>
class Conversion<const T*,T*>
{
public:
enum {kSameType = true};
};
template<class T>
class Conversion<T*, const T*>
{
public:
enum {kSameType = true};
};
enum CopyAlgoSeclector
{
kConservative,
kFast
};
template <typename InIt, typename OutIt>
inline OutIt CopyImpl(InIt first, InIt last, OutIt resultP, Int2Type<kConservative>)
{
return std::copy(first, last, resultP);
}
template <typename InIt, typename OutIt>
inline OutIt CopyImpl(InIt first, InIt last, OutIt resultP, Int2Type<kFast>)
{
return (OutIt) std::memcpy(resultP, first, ((std::size_t) (last - first)) * sizeof(*first));
}
template <typename InIt, typename OutIt>
OutIt ncl_copy(InIt first, InIt last, OutIt resultP)
{
enum { kUseMemCpy =(TypeTraits<InIt>::kIsPointer &&
TypeTraits<OutIt>::kIsPointer &&
TypeTraits<InIt>::kCanUseMemCpyOnPointee &&
TypeTraits<OutIt>::kCanUseMemCpyOnPointee &&
int(TypeTraits<InIt>::kPointeeSize) == int(TypeTraits<OutIt>::kPointeeSize)) ? kFast : kConservative};
return CopyImpl(first, last, resultP, Int2Type<kUseMemCpy>());
}
#else //HAVE_COMPILE_TIME_DISPATCH
template <typename InIt, typename OutIt>
inline OutIt ncl_copy(InIt first, InIt last, OutIt resultP)
{
return std::copy(first, last, resultP);
}
#endif //HAVE_COMPILE_TIME_DISPATCH
//adds an element from the first -> last array to the corresponding element in the result array
template <typename InIt, typename OutIt>
inline OutIt ncl_iadd(InIt first, InIt last, OutIt resultP)
{
for (; first != last; ++first, ++resultP)
*resultP += *first;
return resultP;
}
//adds each element in resultP array with the correcpsonding element from the first -> last array
template <typename InIt, typename OutIt>
inline OutIt ncl_imult(InIt first, InIt last, OutIt resultP)
{
for (; first != last; ++first, ++resultP)
*resultP *= *first;
return resultP;
}
#endif
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