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### cpp_dec_float

    namespace boost{ namespace multiprecision{

    template <unsigned Digits10, class ExponentType = boost::int32_t, class Allocator = void>
    class cpp_dec_float;

    typedef number<cpp_dec_float<50> > cpp_dec_float_50;
    typedef number<cpp_dec_float<100> > cpp_dec_float_100;

    }} // namespaces

Class template `cpp_dec_float` fulfils 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 three template parameters:

Digits10

  The number of decimal digits precision the type should support. Note that this type does not normally perform any dynamic memory allocation, and as a result the `Digits10` template argument should not be set too high or the class's size will grow unreasonably large.

ExponentType

  A signed integer type that represents the exponent of the number

Allocator

  The allocator used: defaults to type `void`, meaning all storage is within the class, and no dynamic allocation is performed, but can be set to a standard library allocator if dynamic allocation makes more sense.

The type of `number_category<cpp_dec_float<Args...> >::type` is `mpl::int_<number_kind_floating_point>`.

More information on this type can be found in the tutorial.