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namespace boost{ namespace multiprecision { template <class FloatingPointType> class cpp_double_fp_backend; typedef number<cpp_double_fp_backend<float>, et_off> cpp_double_float; typedef number<cpp_double_fp_backend<double>, et_off> cpp_double_double; typedef number<cpp_double_fp_backend<long double>, et_off> cpp_double_long_double; typedef number<cpp_double_fp_backend<boost::float128_type>, et_off> cpp_double_float128; // Only when boost::float128_type is available }} // namespaces
The cpp_double_fp_backend
back-end is the sum of two IEEE floating-point numbers combined to create
a type having roughly twice the composite width of one of its parts. The
cpp_double_fp_backend
back-end
is used in conjunction with number
and acts as an entirely C++ header only floating-point number type.
Class template cpp_double_fp_backend
fulfills all of the requirements for a Backend
type. Its members and non-member functions are deliberately not documented:
these are considered implementation details that are subject to change.
The class takes one template parameter:
The consituent IEEE floating-point value of the two limbs of the composite
type. This can be float
,
double
, long double
or when available boost::float128_type
.
The type of number_category<cpp_dec_float<Args...> >::type
is std::integral_constant<int,
number_kind_floating_point>
.
More information on this type can be found in the tutorial.