include/tools/helpers.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9 #ifndef INCLUDED_TOOLS_HELPERS_HXX
  10 #define INCLUDED_TOOLS_HELPERS_HXX
  11
  12 #include <sal/config.h>
  13
  14 #include <cassert>
  15
  16 #include <boost/mpl/or.hpp>
  17 #include <boost/type_traits/is_floating_point.hpp>
  18 #include <boost/type_traits/is_signed.hpp>
  19 #include <boost/type_traits/is_unsigned.hpp>
  20 #include <boost/utility/enable_if.hpp>
  21
  22 template<typename T>
  23 inline
  24 typename boost::enable_if<
  25     boost::mpl::or_< boost::is_signed<T>, boost::is_floating_point<T> >, long>
  26     ::type
  27 MinMax(T nVal, long nMin, long nMax)
  28 {
  29     assert(nMin <= nMax);
  30     return nVal >= nMin
  31         ? (nVal <= nMax ? static_cast<long>(nVal) : nMax) : nMin;
  32 }
  33
  34 template<typename T>
  35 inline typename boost::enable_if<boost::is_unsigned<T>, long>::type MinMax(
  36     T nVal, long nMin, long nMax)
  37 {
  38     assert(nMin <= nMax);
  39     return nMax < 0
  40         ? nMax
  41         : ((nMin < 0 || nVal >= static_cast<unsigned long>(nMin))
  42            ? (nVal <= static_cast<unsigned long>(nMax)
  43               ? static_cast<long>(nVal) : nMax)
  44            : nMin);
  45 }
  46
  47 inline long AlignedWidth4Bytes( long nWidthBits )
  48 {
  49     return ( ( nWidthBits + 31 ) >> 5 ) << 2;
  50 }
  51
  52 inline long FRound( double fVal )
  53 {
  54     return fVal > 0.0 ? static_cast<long>( fVal + 0.5 ) : -static_cast<long>( -fVal + 0.5 );
  55 }
  56
  57 #endif
  58
  59 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */