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Extending to_string To Another Floating Point Type

Base Requirement
If the function to_string is used by an AD type above Base , A specialization for the template structure CppAD::to_string_struct must be defined.

CPPAD_TO_STRING
For most Base types, the following can be used to define the specialization:
     namespace CppAD {
          CPPAD_TO_STRING(Base)
     }
 Note that the CPPAD_TO_STRING macro assumes that the base_limits and base_std_math have already been defined for this type. This macro is defined as follows: 
# define CPPAD_TO_STRING(Base) \
template <> struct to_string_struct<Base>\
{     std::string operator()(const Base& value) \
     {     std::stringstream os;\
          int n_digits = 1 + CppAD::numeric_limits<Base>::digits10; \
          os << std::setprecision(n_digits);\
          os << value;\
          return os.str();\
     }\
};
Input File: cppad/core/base_to_string.hpp