C++ range类代码示例

// The constructor uses the appropriate settings in the config file to
// properly set up the sensor model for the specified "phase" of the LGMD
// input signal.
SensorModel::SensorModel(const std::string& lgmd_phase)
   : m_sigma(0.0f), m_name(lgmd_phase)
{
   const range<float> lgmd_range =
      get_conf(locust_model(), "spike_range", make_range(0.0f, 800.0f)) ;

   // Get the LGMD ranges for the columns of the sensor model
   m_lgmd_ranges = string_to_deque<float>(
      conf<std::string>(lgmd_phase + "_lgmd_ranges", "0 800")) ;
   if (m_lgmd_ranges.size() < 2) { // crappy configuration!
      m_lgmd_ranges.clear() ;
      m_lgmd_ranges.push_back(lgmd_range.min()) ;
      m_lgmd_ranges.push_back(lgmd_range.max()) ;
   }
   sort(m_lgmd_ranges.begin(), m_lgmd_ranges.end()) ;
   if (m_lgmd_ranges.front() > lgmd_range.min())
      m_lgmd_ranges.push_front(lgmd_range.min()) ;
   if (m_lgmd_ranges.back() < lgmd_range.max())
      m_lgmd_ranges.push_back(lgmd_range.max()) ;

   // Figure out how many rows and columns the sensor model's probability
   // table has and allocate space for the required number of elements.
   // Initialize the probability table using a uniform distribution.
   const int C = m_lgmd_ranges.size() - 1 ;
   const int R = column_size() ;
   const int N = R * C ;
   m_prob.reserve(N) ;
   std::fill_n(std::back_inserter(m_prob), N, 1.0f/N) ;

   // Apply Gabbiani model to obtain causal probabilities and Gaussian
   // blur neighbouring bins in each row.
   update(clamp(conf(lgmd_phase + "_sigma", 1.0f),
                0.1f, static_cast<float>(row_size()))) ;
}

// Quick helper to return a label for the current range of probability
// values used for scaling the texels used to represent the sensor
// model's probabilities.
static std::string prob_label(const range<float>& prob_range)
{
    std::ostringstream str ;
    str << "P-range: ["
        << prob_range.min() << ", " << prob_range.max() << ']' ;
    return str.str() ;
}

void MipsELFFile<ELFT>::createRelocationReferences(const Elf_Sym *symbol,
                                                   ArrayRef<uint8_t> symContent,
                                                   ArrayRef<uint8_t> secContent,
                                                   range<Elf_Rel_Iter> rels) {
  const auto value = this->getSymbolValue(symbol);
  for (Elf_Rel_Iter rit = rels.begin(), eit = rels.end(); rit != eit; ++rit) {
    if (rit->r_offset < value || value + symContent.size() <= rit->r_offset)
      continue;

    auto r = new (this->_readerStorage) MipsELFReference<ELFT>(value, *rit);
    this->addReferenceToSymbol(r, symbol);
    this->_references.push_back(r);

    auto addend = readAddend(*rit, secContent);
    auto pairRelType = getPairRelocation(*rit);
    if (pairRelType != llvm::ELF::R_MIPS_NONE) {
      addend <<= 16;
      auto mit = findMatchingRelocation(pairRelType, rit, eit);
      if (mit != eit)
        addend += int16_t(readAddend(*mit, secContent));
      else
        // FIXME (simon): Show detailed warning.
        llvm::errs() << "lld warning: cannot matching LO16 relocation\n";
    }
    this->_references.back()->setAddend(addend);
  }
}

 void operator()(const range& r) const{
     for (int i = r.begin(); i != r.end(); ++i) {
         if (compareWord(word, words[i])) {
             cout << words[i] << endl;
         }
     }
 }

 void jacobi_kernel_wrapper(range const & y_range, size_t n, vector<double> & dst, vector<double> const & src) {
     for(size_t y = y_range.begin(); y < y_range.end(); ++y) {
               double * dst_ptr = &dst[y * n];
         const double * src_ptr = &src[y * n];
         jacobi_kernel( dst_ptr, src_ptr, n );
     }
 }

double_block_type::double_block_type(const range &bounds,
                                     const offset_multiplier &ls)
    : bounds_(bounds), ls_(ls) {
  if (bounds.has_low() || bounds.has_high())
    if (ls.has_offset() || ls.has_multiplier())
      throw std::invalid_argument("Block type cannot have both a bound and"
                                  "an offset/multiplier.");
}

 void jacobi_kernel_wrap(
     range const & r,
     crs_matrix<double> const & A,
     std::vector<double> & x_dst, std::vector<double> const & x_src, std::vector<double> const & b)
 {
     for(std::size_t row = r.begin(); row < r.end(); ++row)
     {
         jacobi_kernel_nonuniform(A, x_dst, x_src, b, row);
     }
 }

void database::del(range key)
{
    assert(_db);
    struct slice sk;

    sk.data  = const_cast<char*>(key.begin());
    sk.len = key.size();

    ::db_remove(_db, &sk);
}

inline bool is_mergeable (const range<iter1_t> &src1,
                          const range<iter2_t> &src2, compare  comp )
{   //---------------------------- begin ------------------------------------
    typedef typename iterator_traits<iter1_t>::value_type type1 ;
    typedef typename iterator_traits<iter2_t>::value_type type2 ;

    static_assert ( std::is_same<type1, type2>::value,
                    "Incompatible iterators\n");
    //---------------------------- begin --------------------------------------
    return comp ( *(src2.front()), *(src1.back()));
};

 __forceinline NodeRef operator() (const PrimRef* prims, const range<size_t>& set, const FastAllocator::CachedAllocator& alloc) const
 {
   size_t n = set.size();
   size_t items = Primitive::blocks(n);
   size_t start = set.begin();
   Primitive* accel = (Primitive*) alloc.malloc1(items*sizeof(Primitive),BVH::byteAlignment);
   typename BVH::NodeRef node = BVH::encodeLeaf((char*)accel,items);
   for (size_t i=0; i<items; i++) {
     accel[i].fill(prims,start,set.end(),bvh->scene);
   }
   return node;
 }

inline range<Iter2_t> init_move ( const range<Iter2_t> & dest,
                                  const range<Iter1_t> & src)
{   //------------- static checking ------------------------------------------
    typedef typename iterator_traits<Iter1_t>::value_type type1 ;
    typedef typename iterator_traits<Iter2_t>::value_type type2 ;
    static_assert ( std::is_same<type1, type2>::value,
                    "Incompatible iterators\n");

    //------------------------------- begin ----------------------------------
    if ( src.size() == 0 ) return range<Iter2_t>(dest.first, dest.first);
    init_move(dest.first ,src.first, src.last  );
    return range<Iter2_t>(dest.first, dest.first + src.size()) ;
};

void OffsetRange(range& ioRange, cell inOffset, SplitType what, int split, int shift)
{
	bool wasSpecial = false;

	if (shift < 0 && what != noSplit)
		if (what == hSplit)
		{

			if (abs(ioRange.left) >= split && abs(ioRange.right) <= split - shift)
				ioRange.Set(0, 0, 0, 0);
			else if (abs(ioRange.left) >= split && abs(ioRange.left) <= split - shift)
			{
				if (ioRange.left < 0)
					ioRange.left = -split;
				else
					ioRange.left = split;
				OffsetCell(ioRange.BotRight(), inOffset, what, split, shift);
				wasSpecial = true;
			}
			else if (abs(ioRange.right) >= split && abs(ioRange.right) <= split - shift)
			{
				if (ioRange.right < 0)
					ioRange.right = -split + 1;
				else
					ioRange.right = split - 1;
				OffsetCell(ioRange.TopLeft(), inOffset, what, split, shift);
				wasSpecial = true;
			}
		}
		else if (what == vSplit)
		{

			if (abs(ioRange.top) >= split && abs(ioRange.bottom) <= split - shift)
				ioRange.Set(0, 0, 0, 0);
			else if (abs(ioRange.top) >= split && abs(ioRange.top) <= split - shift)
			{
				if (ioRange.top < 0)
					ioRange.top = -split;
				else
					ioRange.top = split;
				OffsetCell(ioRange.BotRight(), inOffset, what, split, shift);
				wasSpecial = true;
			}
			else if (abs(ioRange.bottom) >= split && abs(ioRange.bottom) <= split - shift)
			{
				if (ioRange.bottom < 0)
					ioRange.bottom = -split + 1;
				else
					ioRange.bottom = split - 1;
				OffsetCell(ioRange.TopLeft(), inOffset, what, split, shift);
				wasSpecial = true;
			}
		}

	if (!wasSpecial)
	{
		OffsetCell(ioRange.TopLeft(), inOffset, what, split, shift);
		OffsetCell(ioRange.BotRight(), inOffset, what, split, shift);
	}
} /* OffsetRange */

void generic_par_for_wg(range<Dimensions> k_range,
                        range<Dimensions> workgroup_size) {
  queue my_queue;

  // the product of all Dimensions e.g. 10*10*10 for {10,10,10}
  auto linr_size = k_range.size(), linwg_size = workgroup_size.size();

  // these will simply have the group, local and global linear ids assigned to
  // them
  auto group_lin = buffer<int>(linr_size / linwg_size);
  auto loc_lin = buffer<int>(linr_size);
  auto gl_lin = buffer<int>(linr_size);

  my_queue.submit([&](handler &cgh) {
    auto group_lin_acc = group_lin.get_access<access::mode::write>(cgh);
    auto loc_lin_acc = loc_lin.get_access<access::mode::write>(cgh);
    auto gl_lin_acc = gl_lin.get_access<access::mode::read_write>(cgh);

    cgh.parallel_for_work_group<kernel_name>(
        nd_range<Dimensions>(k_range, workgroup_size),
        [=](group<Dimensions> group) {
          group_lin_acc[group.get_linear_id()] = group.get_linear_id();

          group.parallel_for_work_item([=](h_item<Dimensions> tile) {
            loc_lin_acc[tile.get_global_linear_id()] =
                tile.get_local_linear_id();
            gl_lin_acc[tile.get_global_linear_id()] =
                tile.get_global_linear_id();
          });
        });
  });

  auto loc_lin_out = loc_lin.get_access<access::mode::read>();
  auto group_lin_out = group_lin.get_access<access::mode::read>();
  auto gl_lin_out = gl_lin.get_access<access::mode::read>();

  for (int i = 0; i < linr_size / linwg_size; ++i) {
    BOOST_CHECK(group_lin_out[i] == i); // group id
  }

  for (int i = 0; i < linr_size; ++i) {
    BOOST_CHECK(gl_lin_out[i] == i);                            // w1 global id
    BOOST_CHECK(loc_lin_out[i] == loc_lin_out[i] % linwg_size); // local id
  }

  /* We must wait for for the queue to finish as none of buffer's destruction
     is blocking.
   */
  my_queue.wait();
}

void database::add(range key, range data)
{
    assert(_db);
    struct slice sk, sv;

    sk.data  = const_cast<char*>(key.begin());
    sk.len = key.size();
    sv.data  = const_cast<char*>(data.begin());
    sv.len = data.size();

    if (::db_add(_db, &sk, &sv) == 0)
    {
        throw exception("error adding to ness backend");
    }
}

	[[nodiscard]]
	inline size_t read(std::istream& Stream, const range<char*>& Buffer)
	{
		{
			const auto Exceptions = Stream.exceptions();
			Stream.exceptions(Exceptions & ~(Stream.failbit | Stream.eofbit));
			SCOPE_EXIT{ Stream.exceptions(Exceptions); };

			Stream.read(Buffer.data(), Buffer.size());
			if (!Stream.bad() && Stream.eof())
				Stream.clear();
		}

		return Stream.gcount();
	}