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。 |
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