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Convert Certain Types to a String

Syntax
# include <cppad/utility/to_string.hpp>  s = to_string(value) .

Purpose
This routine is similar to the C++11 routine std::to_string with the following differences:
1. It works with C++98.
2. It has been extended to the fundamental floating point types.
3. It has specifications for extending to an arbitrary type; see base_to_string .
4. If <cppad/cppad.hpp> is included, and it has been extended to a Base type, it automatically extends to the AD types above Base .
5. For integer types, conversion to a string is exact. For floating point types, conversion to a string yields a value that has relative error within machine epsilon.

value

Integer
The argument value can have the following prototype       const Integer&  value  where Integer is any of the fundamental integer types; e.g., short int and unsigned long. Note that if C++11 is supported by this compilation, unsigned long long is also a fundamental integer type.

Float
The argument value can have the following prototype       const Float&  value  where Float is any of the fundamental floating point types; i.e., float, double, and long double.

s
The return value has prototype       std::string s  and contains a representation of the specified value .

Integer
If value is an Integer , the representation is equivalent to os << value where os is an std::ostringstream.

Float
If value is a Float , enough digits are used in the representation so that the result is accurate to withing round off error.

Example
The file to_string.cpp contains an example and test of this routine. It returns true if it succeeds and false otherwise.