C++ cpp_int_backend类代码示例

OStack程序员社区-中国程序员成长平台 › 门户 › 编程› C++›C++教程

原作者: [db:作者] 来自: [db:来源] 收藏邀请

本文整理汇总了C++中cpp_int_backend类的典型用法代码示例。如果您正苦于以下问题：C++ cpp_int_backend类的具体用法？C++ cpp_int_backend怎么用？C++ cpp_int_backend使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

在下文中一共展示了cpp_int_backend类的7个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: eval_msb

inline typename enable_if_c<!is_trivial_cpp_int<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value, unsigned>::type
   eval_msb(const cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& a)
{
   using default_ops::eval_get_sign;
   if(eval_get_sign(a) == 0)
   {
      BOOST_THROW_EXCEPTION(std::range_error("No bits were set in the operand."));
   }
   if(a.sign())
   {
      BOOST_THROW_EXCEPTION(std::range_error("Testing individual bits in negative values is not supported - results are undefined."));
   }

   //
   // Find the index of the most significant bit that is non-zero:
   //
   return (a.size() - 1) * cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>::limb_bits + boost::multiprecision::detail::find_msb(a.limbs()[a.size() - 1]);
}

开发者ID:Caraul，项目名称:airgit，代码行数:18，代码来源:misc.hpp

示例2: eval_convert_to

inline typename enable_if_c<
            is_trivial_cpp_int<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value
            && is_signed_number<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value
         >::type
   eval_convert_to(R* result, const cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& val)
{
   typedef typename common_type<R, typename cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>::local_limb_type>::type common_type;
   if(std::numeric_limits<R>::is_specialized && (static_cast<common_type>(*val.limbs()) > static_cast<common_type>((std::numeric_limits<R>::max)())))
   {
      conversion_overflow(typename cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>::checked_type());
      *result = (std::numeric_limits<R>::max)();
   }
   else
      *result = static_cast<R>(*val.limbs());
   if(val.isneg())
   {
      check_is_negative(mpl::bool_<boost::is_signed<R>::value || boost::is_floating_point<R>::value>());
      *result = negate_integer(*result, mpl::bool_<boost::is_signed<R>::value || boost::is_floating_point<R>::value>());
   }
}

开发者ID:Caraul，项目名称:airgit，代码行数:20，代码来源:misc.hpp

示例3: eval_msb

inline typename enable_if_c<is_trivial_cpp_int<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value, unsigned>::type
   eval_msb(const cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& a)
{
   using default_ops::eval_get_sign;
   if(eval_get_sign(a) == 0)
   {
      BOOST_THROW_EXCEPTION(std::range_error("No bits were set in the operand."));
   }
   if(a.sign())
   {
      BOOST_THROW_EXCEPTION(std::range_error("Testing individual bits in negative values is not supported - results are undefined."));
   }
   return eval_msb_imp(a);
}

开发者ID:AbhinavJain13，项目名称:turicreate，代码行数:14，代码来源:misc.hpp

示例4: eval_bit_flip

inline typename enable_if_c<!is_trivial_cpp_int<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value>::type
   eval_bit_flip(cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& val, unsigned index)
{
   unsigned offset = index / cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>::limb_bits;
   unsigned shift = index % cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>::limb_bits;
   limb_type mask = shift ? limb_type(1u) << shift : limb_type(1u);
   if(offset >= val.size())
   {
      unsigned os = val.size();
      val.resize(offset + 1, offset + 1);
      if(offset >= val.size())
         return;  // fixed precision overflow
      for(unsigned i = os; i <= offset; ++i)
         val.limbs()[i] = 0;
   }
   val.limbs()[offset] ^= mask;
   val.normalize();
}

开发者ID:AbhinavJain13，项目名称:turicreate，代码行数:18，代码来源:misc.hpp

示例5: eval_divide

BOOST_MP_FORCEINLINE typename enable_if_c<
         is_trivial_cpp_int<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value 
         && is_trivial_cpp_int<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value
         && (is_signed_number<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value 
            || is_signed_number<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value)
         >::type 
   eval_divide(
      cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& result, 
      const cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& o)
{
   if(!*o.limbs())
      BOOST_THROW_EXCEPTION(std::overflow_error("Division by zero."));
   *result.limbs() /= *o.limbs();
   result.sign(result.sign() != o.sign());
}

开发者ID:1ack，项目名称:Impala，代码行数:15，代码来源:divide.hpp

示例6: is_valid_bitwise_op

void is_valid_bitwise_op(
      const cpp_int_backend<MinBits1, MaxBits1, signed_magnitude, Checked1, Allocator1>& result, const mpl::int_<checked>&)
{
   if(result.sign())
      BOOST_THROW_EXCEPTION(std::range_error("Bitwise operations on negative values results in undefined behavior."));
}

开发者ID:LocutusOfBorg，项目名称:poedit，代码行数:6，代码来源:bitwise.hpp

示例7: eval_gcd

inline typename enable_if_c<!is_trivial_cpp_int<cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> >::value>::type
   eval_gcd(
      cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& result,
      const cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& a,
      const cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1>& b)
{
   using default_ops::eval_lsb;
   using default_ops::eval_is_zero;
   using default_ops::eval_get_sign;

   if(a.size() == 1)
   {
      eval_gcd(result, b, *a.limbs());
      return;
   }
   if(b.size() == 1)
   {
      eval_gcd(result, a, *b.limbs());
      return;
   }

   int shift;

   cpp_int_backend<MinBits1, MaxBits1, SignType1, Checked1, Allocator1> u(a), v(b);

   int s = eval_get_sign(u);

   /* GCD(0,x) := x */
   if(s < 0)
   {
      u.negate();
   }
   else if(s == 0)
   {
      result = v;
      return;
   }
   s = eval_get_sign(v);
   if(s < 0)
   {
      v.negate();
   }
   else if(s == 0)
   {
      result = u;
      return;
   }

   /* Let shift := lg K, where K is the greatest power of 2
   dividing both u and v. */

   unsigned us = eval_lsb(u);
   unsigned vs = eval_lsb(v);
   shift = (std::min)(us, vs);
   eval_right_shift(u, us);
   eval_right_shift(v, vs);

   do
   {
      /* Now u and v are both odd, so diff(u, v) is even.
      Let u = min(u, v), v = diff(u, v)/2. */
      s = u.compare(v);
      if(s > 0)
         u.swap(v);
      if(s == 0)
         break;
      if(v.size() <= 2)
      {
         if(v.size() == 1)
            u = integer_gcd_reduce(*v.limbs(), *u.limbs());
         else
         {
            double_limb_type i, j;
            i = v.limbs()[0] | (static_cast<double_limb_type>(v.limbs()[1]) << sizeof(limb_type) * CHAR_BIT);
            j = (u.size() == 1) ? *u.limbs() : u.limbs()[0] | (static_cast<double_limb_type>(u.limbs()[1]) << sizeof(limb_type) * CHAR_BIT);
            u = integer_gcd_reduce(i, j);
         }
         break;
      }
      eval_subtract(v, u);
      vs = eval_lsb(v);
      eval_right_shift(v, vs);
   }
   while(true);

   result = u;
   eval_left_shift(result, shift);
}

开发者ID:AbhinavJain13，项目名称:turicreate，代码行数:88，代码来源:misc.hpp

注：本文中的cpp_int_backend类示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。