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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_BASEBMP_METAFUNCTIONS_HXX
#define INCLUDED_BASEBMP_METAFUNCTIONS_HXX
#include <boost/mpl/integral_c.hpp>
#include <vigra/metaprogramming.hxx>
#include <vigra/numerictraits.hxx>
#include <functional>
namespace basebmp
{
// TODO(Q3): move to generic place (o3tl?)
/** template meta function: add const qualifier to 2nd type, if given
1st type has it
*/
template<typename A, typename B> struct clone_const
{
typedef B type;
};
template<typename A, typename B> struct clone_const<const A,B>
{
typedef const B type;
};
/** template meta function: add const qualifier to plain type (if not
already there)
*/
template <typename T> struct add_const
{
typedef const T type;
};
template <typename T> struct add_const<const T>
{
typedef const T type;
};
/// template meta function: remove const qualifier from plain type
template <typename T> struct remove_const
{
typedef T type;
};
template <typename T> struct remove_const<const T>
{
typedef T type;
};
//--------------------------------------------------------------
/// Base class for an adaptable ternary functor
template< typename A1, typename A2, typename A3, typename R > struct TernaryFunctorBase
{
typedef A1 first_argument_type;
typedef A2 second_argument_type;
typedef A3 third_argument_type;
typedef R result_type;
};
//--------------------------------------------------------------
/** template meta function: ensure that given integer type is unsigned
If given integer type is already unsigned, return as-is -
otherwise, convert to unsigned type of same or greater range.
*/
template< typename T > struct make_unsigned;
#define BASEBMP_MAKE_UNSIGNED(T,U) \
template<> struct make_unsigned<T> { \
typedef U type; \
};
BASEBMP_MAKE_UNSIGNED(signed char,unsigned char)
BASEBMP_MAKE_UNSIGNED(unsigned char,unsigned char)
BASEBMP_MAKE_UNSIGNED(short,unsigned short)
BASEBMP_MAKE_UNSIGNED(unsigned short,unsigned short)
BASEBMP_MAKE_UNSIGNED(int,unsigned int)
BASEBMP_MAKE_UNSIGNED(unsigned int,unsigned int)
BASEBMP_MAKE_UNSIGNED(long,unsigned long)
BASEBMP_MAKE_UNSIGNED(unsigned long,unsigned long)
#undef BASEBMP_MAKE_UNSIGNED
/// cast integer to unsigned type of similar size
template< typename T > inline typename make_unsigned<T>::type unsigned_cast( T value )
{
return static_cast< typename make_unsigned<T>::type >(value);
}
//--------------------------------------------------------------
/// returns true, if given number is strictly less than 0
template< typename T > inline bool is_negative( T x )
{
return x < 0;
}
/// Overload for ints (branch-free)
inline bool is_negative( int x )
{
// force logic shift (result for signed shift right is undefined)
return static_cast<unsigned int>(x) >> (sizeof(int)*8-1);
}
//--------------------------------------------------------------
/// Results in VigraTrueType, if T is of integer type and scalar
template< typename T, typename trueCase, typename falseCase >
struct ifScalarIntegral
{
typedef
typename vigra::If<
typename vigra::NumericTraits< T >::isIntegral,
typename vigra::If<
typename vigra::NumericTraits< T >::isScalar,
trueCase,
falseCase >::type,
falseCase >::type type;
};
/// Results in VigraTrueType, if T is of non-integer type and scalar
template< typename T, typename trueCase, typename falseCase >
struct ifScalarNonIntegral
{
typedef
typename vigra::If<
typename vigra::NumericTraits< T >::isIntegral,
falseCase,
typename vigra::If<
typename vigra::NumericTraits< T >::isScalar,
trueCase,
falseCase >::type >::type type;
};
/// Results in VigraTrueType, if both T1 and T2 are of integer type and scalar
template< typename T1, typename T2, typename trueCase, typename falseCase >
struct ifBothScalarIntegral
{
typedef
typename ifScalarIntegral<
T1,
typename ifScalarIntegral<
T2,
trueCase,
falseCase >::type,
falseCase >::type type;
};
//--------------------------------------------------------------
/// Count number of trailing zeros
template< unsigned int val > struct numberOfTrailingZeros
{
enum { next = val >> 1 };
enum { value = vigra::IfBool< (val & 1) == 0,
numberOfTrailingZeros<next>,
boost::mpl::integral_c< int,-1 > > ::type::value + 1 };
};
template<> struct numberOfTrailingZeros<0>
{
enum { value = 0 };
};
//--------------------------------------------------------------
/// Count number of one bits
template< unsigned int val > struct bitcount
{
enum { next = val >> 1 };
enum { value = bitcount<next>::value + (val & 1) };
};
template<> struct bitcount<0>
{
enum { value = 0 };
};
//--------------------------------------------------------------
/// Shift left for positive shift value, and right otherwise
template< typename T > inline T shiftLeft( T v, int shift )
{
return shift > 0 ? v << shift : v >> (-shift);
}
/// Shift right for positive shift value, and left otherwise
template< typename T > inline T shiftRight( T v, int shift )
{
return shift > 0 ? v >> shift : v << (-shift);
}
//--------------------------------------------------------------
/// Replace non-std project2nd from SGI extensions
template< typename T1, typename T2 >
struct project2nd : public std::binary_function<T1, T2, T2>
{
T2 operator() (const T1&, const T2& v) const { return v; }
};
} // namespace basebmp
#endif /* INCLUDED_BASEBMP_METAFUNCTIONS_HXX */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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